Data Set Information
|
| DATA_SET_NAME |
MESSENGER E/V/H GRNS 3 NEUTRON SPECTROMETER CDR V2.0
|
| DATA_SET_ID |
MESS-E/V/H-GRNS-3-NS-CDR-V2.0
|
| NSSDC_DATA_SET_ID |
|
| DATA_SET_TERSE_DESCRIPTION |
|
| DATA_SET_DESCRIPTION |
Instrument Overview : The MErcury Surface, Space ENvironment, GEochemistry, and Ranging (MESSENGER) Neutron Spectrometer (NS) sensor consists of three scintillators, each wrapped separately and coupled to separate photo-multiplier tubes. The three scintillators are sensitive to neutrons of different energies: thermal neutrons (0.025 - 1 eV), epithermal neutrons (1eV - 500 keV), and fast neutrons (500 keV - 7 MeV). The first and third scintillators are lithium (6Li)-glass scintillators (LG1 and LG2) which respond to a combination of thermal and epithermal neutrons. The middle scintillator is a borated plastic (BP) scintillator that responds only to epithermal and fast neutrons due to its electronics setup. The interaction of galactic cosmic rays (GCR) with the surface of Mercury produces neutrons, some of which escape the surface and produce a neutron signal that can be measured by the orbiting NS sensor. The measured neutron energy spectrum reflects the transport properties of the surface composition and is sensitive to depths down to about 1 m. Thermal neutrons are sensitive to a variety of elements, including Fe, Ti, Gd, Sm, Cl, and C. Epithermal neutrons are mostly sensitive to H abundance. Fast neutrons can provide a good measure of average atomic mass. For the MESSENGER mission, the NS sensor will establish and map the abundance of H over most of the northern hemisphere of Mercury, providing significant new information regarding the potential presence of water ice within and near permanently shaded craters near the north pole. See the NS_INST.CAT file for more information and [GOLDSTENETAL2007] for full details. Data Set Overview : This data set consists of MESSENGER NS calibrated data records (CDRs). A single CDR data file contains the observations with a time tag corresponding to a given Earth day. There are five standard data products associated with the NS instrument. NS_CDR_SPECTRA include LG1 singles, LG2 singles, BP singles, Time Correlated (TC) early, and TC late spectra. Net fast neutron spectra are the difference between TC early and TC late (i.e., fast neutron spectra : TC early - TC late). NS_CDR_COUNTS include NS counting rate data for 17 different monitored counting rates. NS_CDR_GCR_SPECTRA include spectra from LG1 and LG2 when a coincidence condition is detected in both LG sensors and the BP sensor. The NS_CDR_ENG data products include instrument engineering data. The NS_CDR_GAB data product contains the values from the NS Gamma Ray Burst EDR in ASCII form with some additional time tag columns. This is version 2 of this data set; version 1 has been superceded. Calibration Overview : The following operations are applied to the Experiment Data Records (EDRs) to arrive at calibrated spectra (CDRs): 1) Normalization of total counts to the accumulation time, so that the units are in counts per second; 2) Corrections (if needed) for gain variations in the spectra data; 3) Corrections (if needed) for GCR variations in the spectra and counting rates; 4) Corrections for deadtime (if needed) in the spectra and counting rates. All of these corrections are reversible such that the EDR and CDR datasets can be derived from each other. Coordinate Systems : For planetary orbital and flyby data, the NS-specific data also have two coordinate systems (in addition to standard J2000 and Planetocentric body fixed) for expressing spacecraft velocity and attitude data: the nadir fixed coordinate system and the spacecraft fixed coordinate system. The nadir fixed coordinate system is defined as follows: * The z-axis is defined as the vector from the spacecraft center to the flyby or orbiting planet center. * The nadir fixed y-axis is defined as the cross product of the nadir z-axis and the spacecraft velocity vector (where both are expressed in the J2000 coordinate system). * The nadir fixed x-axis is defined as the cross product of the nadir fixed y-axis with the nadir fixed z-axis. The spacecraft fixed coordinate system is defined as follows: * The spacecraft fixed x-axis is the vector normal to the NS LG1 sensor and is parallel to the spacecraft solar panel booms. * The spacecraft fixed y-axis is in the direction from the spacecraft down the magnetometer boom. * The spacecraft fixed z-axis is the viewing direction from the instrument deck. Data : There are five standard data products associated with the NS instrument. A single CDR data file will contain the observations with a time tag corresponding to a given Earth day. The NS Spectra CDRs are organized as binary data files and include LG1 singles, LG2 singles, BP singles, Time Correlated (TC) early, and TC late spectra, along with associated timing, spatial, and engineering data taken at the beginning of the spectral collection period. The NS Counts CDR are organized as binary data files and include counting rate data for 17 different monitored counting rates, along with associated timing, spatial, and engineering data taken at the beginning of the spectral collection period. The NS Galactic Cosmic Ray CDRs are organized as binary data files and include spectra from LG1 and LG2 when a triple coincidence is detected in all three sensors, along with associated timing, spatial, and engineering data taken at the beginning of the spectral collection period. The NS Engineering CDRs are organized as ASCII tables and include instrumental engineering data. The NS Gamma Ray Burst CDRs are organized as ASCII tables containing the data from the NS Gamma Ray Burst EDR in ASCII format along with additional time tags. The general form of the NS CDR file names is 'NS_CDR_ZZZYYYYDDDWWW.XXX,' where NS instrument identifier: represents the NS instrument. CDR data product identifier: CDR ZZZ data product name SPE - NS CDR Spectra with associated engineering, timing and spatial data. CTS - NS CDR Counts with associated engineering, timing, and spatial data. GCR - NS CDR Galactic Cosmic Ray spectra with associated engineering, timing and spatial data. ENG - Engineering data. GAB - Gamma-Ray Burst data. YYYY four-digit year corresponding to the start-time of the first record in the NS data file. DDD three-digit day of the year corresponding to the start time of the first record in the NS CDR data file. WWW reserved character string used during the course of the mission as necessary to identify 'special' data products. Nominal data products are identified by ZZZ. .XXX the file extension (.DAT for binary files, .TAB for ascii files). See NS_CDR_DDR_SIS.PDF in the DOCUMENT folder of this volume for more information.
|
| DATA_SET_RELEASE_DATE |
2016-05-06T00:00:00.000Z
|
| START_TIME |
2004-08-12T07:01:02.000Z
|
| STOP_TIME |
2015-04-30T06:53:47.000Z
|
| MISSION_NAME |
MESSENGER
|
| MISSION_START_DATE |
2004-08-03T12:00:00.000Z
|
| MISSION_STOP_DATE |
2015-04-30T12:00:00.000Z
|
| TARGET_NAME |
EARTH
VENUS
CALIBRATION
MERCURY
|
| TARGET_TYPE |
PLANET
CALIBRATION
|
| INSTRUMENT_HOST_ID |
MESS
|
| INSTRUMENT_NAME |
NEUTRON SPECTROMETER
|
| INSTRUMENT_ID |
NS
|
| INSTRUMENT_TYPE |
NEUTRON SPECTROMETER
|
| NODE_NAME |
Navigation and Ancillary Information Facility
|
| ARCHIVE_STATUS |
ARCHIVED
|
| CONFIDENCE_LEVEL_NOTE |
Confidence Level Overview : The NS CDR data have been processed as described in the 'MESSENGER Neutron Spectrometer (NS) EDR-to-CDR-to-DDR Processing' document (MESSNS_PROCESSING.PDF, CALIB directory). Data presented here are an accurate representation of the NS data as processed from the EDR files, where the processing includes time normalization, and merging of spacecraft spatial and rotational information to the data. Review : The NS CDR was reviewed internally by the NS team prior to release to the PDS. PDS also performed an external review of the NS CDR. Data Coverage and Quality : Data reported are the calibrated data received from the spacecraft during the the following mission phases: Launch, Earth Cruise, Earth Flyby, Venus 1 Cruise, Venus 1 Flyby, Venus 2 Cruise, Venus 2 Flyby, Mercury 1 Cruise, Mercury 1 flyby, Mercury 2 Cruise, Mercury 2 flyby Mercury 3 Cruise, Mercury 3 Flyby, Mercury 4 Cruise, Mercury Orbit, Mercury Orbit Year 2, Mercury Orbit Year 3, Mercury Orbit Year 4, and Mercury Orbit Year 5. These mission phases are defined as: Start time End time Phase Name Date (DOY) Date (DOY) ----------------- ----------------- ----------------- Launch 03 Aug 2004 (216) 12 Sep 2004 (256) Earth Cruise 13 Sep 2004 (257) 18 Jul 2005 (199) Earth Flyby 19 Jul 2005 (200) 16 Aug 2005 (228) Venus 1 Cruise 17 Aug 2005 (229) 09 Oct 2006 (282) Venus 1 Flyby 10 Oct 2006 (283) 07 Nov 2006 (311) Venus 2 Cruise 08 Nov 2006 (312) 22 May 2007 (142) Venus 2 Flyby 23 May 2007 (143) 20 Jun 2007 (171) Mercury 1 Cruise 21 Jun 2007 (172) 30 Dec 2007 (364) Mercury 1 Flyby 31 Dec 2007 (365) 28 Jan 2008 (028) Mercury 2 Cruise 29 Jan 2008 (029) 21 Sep 2008 (265) Mercury 2 Flyby 22 Sep 2008 (266) 20 Oct 2008 (294) Mercury 3 Cruise 21 Oct 2008 (295) 15 Sep 2009 (258) Mercury 3 Flyby 16 Sep 2009 (259) 14 Oct 2009 (287) Mercury 4 Cruise 15 Oct 2009 (288) 03 Mar 2011 (062) Mercury Orbit 04 Mar 2011 (063) 17 Mar 2012 (077) Mercury Orbit Year 2 18 Mar 2012 (078) 17 Mar 2013 (076) Mercury Orbit Year 3 18 Mar 2013 (077) 17 Mar 2014 (076) Mercury Orbit Year 4 18 Mar 2014 (077) 17 Mar 2015 (076) Mercury Orbit Year 5 18 Mar 2015 (077) 30 Apr 2015 (120) A nonscience 'aliveness' test was conducted in August 2004. The first full function test was conducted April-May 2005. In August and September 2005 and March 2006, engineering tests were conducted to determine origin and magnitude of gain changes in a Li-glass detector channel. A second full function test was conducted in June 2006 after new software was uploaded. In January 2007 a calibration period was begun and the NS was left on. The NS was off from mid-October 2007 through mid-December 2007 and from February 26, 2008 through March 28, 2008. The NS had four off periods during the Mercury 3 Cruise phase: Nov. 2008-Jan 2009; July 2009; Four days in August 2009; Two days in early September 2009. The NS had one off period during the Mercury_3_Flyby period due to the spacecraft safing event that occurred during the Mercury 3 flyby. The NS had three off periods during the Mercury 4 Cruise phase: Oct. 2009-Dec. 2009; four days in May 2010; and three days in Dec. 2010. The NS had one off period during the Mercury Orbit phase in March 2011. This off period was two days prior to Mercury Orbit Insertion (MOI) and continued during the first week of orbit operations. During the PDS data delivery from May 18, 2011 to September 17, 2011, the NS was shut off for nine consecutive days when the MESSENGER spacecraft passed through its first long eclipse period. The specific off period was from May 24, 2011 21:34:49 to June 3, 2011 0:17:49. During the PDS data delivery from May 18, 2011 to September 17, 2011, the high voltage (HV) to the LG and BP sensors was shut down three times during spacecraft thrusting maneuvers. Each time, the HV was shut down for approximately four hours while the spacecraft was near apoapsis. The specific times for the HV shut down are: June 15, 2011 16:12:08 - June 15, 2011 20:30:16; July 26, 2011 17:40:16 - July 26, 2011 21:55:16; September 7, 2011 11:38:16 - September 7, 2011 16:05:50. During the PDS data delivery from September 18, 2011 to March 25, 2012, the NS HV to the LG and BP sensor was shut down four times. Three times, the HV was shut down during spacecraft thrusting maneuvers. The specific times for these HV shut downs are: October 24, 2011 18:29:00 - October 24, 2011 23:16:00; December 5, 2011 12:36:00 - December 5, 2011 17:18:00; March 2, 2012 22:09:22 - March 3, 2012 02:47:54. The HV to the LG and BP sensors was shut down a fourth time during a large solar particle event when the NS sensors were safed because of the large charged particle flux. The times for this HV shut down period were: March 7, 2012 0:24:42 - March 12, 2012 15:50:42. During the data delivery from March 26, 2012 to September 17, 2012, the NS HV was shut down once from April 16, 2012, ~18:00 UTC to April 21, 2012, ~0:00 UTC for the MESSENGER spacecraft change from 12-hour orbit to 8-hour orbit. During the data delivery from September 18, 2012 to March 17, 2013, the NS HV for the BP sensor was shut down twice: first from September 20, 2012 at 09:40 UTC to September 24, 2012 at 17:38 UTC when the NS BP sensor went into safe mode due to an energetic particle event; second on March 16, 2013 from 06:53 UTC to 08:00 UTC when the NS BP sensor went into safe mode due to an energetic particle event. During the data delivery from March 18, 2013 to September 17, 2013 the NS HV was shut down six times into safe mode due to high rates from energetic particles: 1) April 24, 2013 to April 25, 2013; 2) May 2, 2013, 8:45 UTC to May 2, 2013, 9:16 UTC; 3) May 21, 2013, 8:57 UTC to May 21, 2013, 9:32 UTC; 4) May 21, 2013, 17:02 UTC to May 21, 2013, 17:33 UTC; 5) June 21, 2013 to June 24, 2013; 6) August 19, 2013 to August 22, 2013. During the data delivery from September 18, 2013 to March 17, 2014 the NS HV for the BP and/or LG sensor was shut down 6 times: 1) for approximately two hours on October 25, 2013; 2) October 28, 2013, 16:00 UTC to October 29, 2013 02:00 UTC; 3) For less than an hour on November 5, 2013; 4) For less than an hour on December 14, 2013; 5) December 26, 2013 07:00 UTC to December 31, 2013 20:00 UTC; 6) For less than an hour on Jan 25, 2014. During the data delivery from March 18, 2014 to September 17, 2014 the NS HV for the BP and LG sensors was shut down twice for a few hours for spacecraft thrusting maneuvers. These times were June 17, 2014 at 12:00 UTC and September 12, 2014 at 13:00 UTC. During the data delivery from September 18, 2014 to April 30, 2015 the NS HV for the BP and LG sensors was shut down for a few hours for spacecraft thrusting maneuvers. These days were September 28, 2014 around 07:44 UTC, October 24, 2014 around 16:00 UTC, and January 21, 2015 around 19:30 UTC. The specific operational periods in relation to the mission phases were: Start time End time Phase Name Date (DOY) Date (DOY) ----------------- ----------------- ----------------- Launch 12 Aug 2004 (225) 13 Aug 2004 (226) Earth Cruise 18 Apr 2005 (108) 23 May 2004 (143) Earth Flyby 16 Aug 2005 (228) 16 Aug 2005 (228) Venus 1 Cruise 07 Sep 2005 (250) 11 Sep 2005 (254) 07 Mar 2006 (066) 11 Mar 2006 (070) 16 Jun 2006 (167) 16 Jun 2006 (167) 21 Jun 2006 (172) 22 Jun 2006 (173) Venus 1 Flyby No Data Venus 2 Cruise 31 Jan 2007 (031) 22 May 2007 (142) Venus 2 Flyby 23 May 2007 (143) 20 Jun 2007 (171) Mercury 1 Cruise 21 Jun 2007 (172) 17 Oct 2007 (290) Mercury 1 Cruise 21 Dec 2007 (355) 30 Dec 2007 (364) Mercury 1 Flyby 31 Dec 2007 (365) 28 Jan 2008 (028) Mercury 2 Cruise 29 Jan 2008 (029) 25 Feb 2008 (056) Mercury 2 Cruise 29 Mar 2008 (089) 21 Sep 2008 (265) Mercury 2 Flyby 22 Sep 2008 (266) 20 Oct 2008 (294) Mercury 3 Cruise 21 Oct 2008 (295) 19 Nov 2008 (324) 11 Jan 2009 (011) 07 Jul 2009 (188) 22 Jul 2009 (203) 18 Aug 2009 (230) 23 Aug 2009 (235) 01 Sep 2009 (244) 04 Sep 2009 (247) 15 Sep 2009 (258) Mercury 3 Flyby 16 Sep 2009 (259) 29 Sep 2009 (272) 01 Oct 2009 (274) 12 Oct 2009 (285) Mercury 4 Cruise 09 Dec 2009 (343) 21 May 2010 (141) 26 May 2010 (146) 03 Dec 2010 (337) 06 Dec 2010 (340) 03 Mar 2011 (062) Mercury Orbit 04 Mar 2011 (063) 16 Mar 2011 (075)(for MOI) 23 Mar 2011 (082) 24 May 2011 (144) 03 Jun 2011 (154) 07 Mar 2012 (067) 12 Mar 2012 (072) 17 Mar 2012 (077) Mercury Orbit Year 2 18 Mar 2012 (078) 16 Apr 2012 (107) 21 Apr 2012 (112) 20 Sep 2012 (264) 24 Sep 2012 (268) 17 Mar 2013 (076) Mercury Orbit Year 3 18 Mar 2013 (077) 17 Mar 2014 (076) Mercury Orbit Year 4 18 Mar 2014 (077) 17 Mar 2015 (076) Mercury Orbit Year 5 18 Mar 2015 (077) 30 Apr 2015 (120) Quality and Limitations : This data set has been processed as described in the 'MESSENGER Neutron Spectrometer (NS) EDR-to-CDR-to-DDR Processing' document. All data have been successfully processed through the NS data processing codes and all data are found to be nominal. Other than the scheduled 'instrument off' periods described above, no data gaps or corrupted data have been identified for any of the NS operational periods. Although there may be some data not identified as missing or corrupted, such data should be minimal and a very small fraction of the available data. Regarding data quality, the primary factor that affects the quality of the NS data are solar particle events. The table below lists the times during the data delivery period where it was determined that there were fluxes of solar energetic particles high enough to affect the data background. The columns of the table are: Name (numeric label for the solar particle event); start time in UTC indicating the starting time of the solar particle event; stop time in UTC indicating the stopping time of the solar particle event; type (All stands for all sensors, LG1 or LG2 stands for lithium glass sensor 1 or 2 only; BPS stands for borated plastic scintillator only). Name Start Time End Time Type ------------------------------------------------------------ 001 03/24/2011 11:48:19 03/24/2011 18:50:03 All 002 03/25/2011 05:52:23 03/25/2011 10:15:36 All 003 03/25/2011 23:01:18 03/26/2011 04:28:38 LG2 004 03/30/2011 17:00:00 03/30/2011 22:00:00 All 005 04/04/2011 09:48:40 04/04/2011 13:56:56 LG2 006 05/24/2011 22:00:00 06/03/2011 03:45:00 All 007 06/04/2011 06:13:13 06/10/2011 22:00:00 BPS 008 06/04/2011 06:13:13 06/12/2011 07:00:00 LG1 009 06/04/2011 06:13:13 06/15/2011 22:00:00 All 010 08/02/2011 05:39:24 08/02/2011 18:24:21 All 011 08/04/2011 03:33:28 08/05/2011 17:00:00 All 012 08/09/2011 07:00:00 08/10/2011 03:00:00 All 013 09/05/2011 05:39:00 09/08/2011 14:00:00 LG2 014 09/06/2011 04:45:00 09/06/2011 07:10:00 BPS 015 09/07/2011 04:01:00 09/07/2011 06:32:00 BPS 016 09/07/2011 18:58:00 09/08/2011 06:00:00 BPS 017 09/08/2011 22:20:00 09/10/2011 02:00:00 All 018 09/22/2011 11:25:40 09/24/2011 08:00:00 All 019 10/04/2011 12:53:49 10/06/2011 02:55:42 All 020 10/14/2011 12:56:57 10/15/2011 10:13:16 All 021 10/17/2011 08:10:30 10/17/2011 11:38:16 LG2 022 11/03/2011 22:50:16 11/06/2011 02:00:00 All 023 11/09/2011 12:56:40 11/09/2011 18:45:00 All 024 11/17/2011 20:52:37 11/18/2011 16:50:00 All 025 12/14/2011 14:20:00 12/14/2011 22:30:00 All 026 12/25/2011 17:48:00 12/26/2011 15:55:00 All 027 01/02/2012 14:54:00 01/03/2012 13:50:00 All 028 01/23/2012 05:36:00 02/06/2012 00:01:00 All 029 03/03/2012 20:11:00 03/17/2012 00:00:00 All 030 04/05/2012 21:13:05 04/06/2012 00:14:30 All 031 04/09/2012 11:04:13 04/09/2012 17:17:43 All 032 04/26/2012 08:25:36 04/26/2012 12:10:43 All 033 04/27/2012 16:00:00 04/28/2012 02:58:00 All 034 05/17/2012 02:32:33 05/19/2012 02:37:40 All 035 05/26/2012 20:16:48 05/30/2012 02:42:00 All 036 06/28/2012 16:04:00 06/29/2012 17:00:00 All 037 07/01/2012 18:58:00 07/02/2012 02:00:00 All 038 07/02/2012 10:18:10 07/02/2012 18:09:00 All 039 07/03/2012 03:03:15 07/03/2012 11:04:13 All 040 07/12/2012 16:26:11 07/14/2012 19:30:00 All 041 07/17/2012 17:00:00 07/21/2012 02:00:00 All 042 07/23/2012 03:52:00 07/29/2012 12:00:00 All 043 07/30/2012 18:34:28 07/30/2012 21:59:08 All 044 07/31/2012 21:47:30 08/01/2012 03:00:00 All 045 09/08/2012 11:14:27 09/08/2012 17:33:04 All 046 09/19/2012 10:48:00 09/25/2012 02:00:00 All 047 09/28/2012 09:50:00 10/01/2012 02:00:00 All 048 10/08/2012 12:22:25 10/09/2012 09:52:50 All 049 10/14/2012 00:30:30 10/14/2012 20:27:11 All 050 10/23/2012 02:57:19 10/23/2012 03:27:48 All 051 10/26/2012 11:29:47 10/26/2012 19:51:10 All 052 11/08/2012 01:45:18 11/08/2012 09:47:18 All 053 11/18/2012 03:33:20 11/18/2012 10:06:41 All 054 11/21/2012 13:42:49 11/22/2012 03:54:25 All 055 02/05/2013 08:10:15 02/05/2013 11:09:20 All 056 03/15/2013 17:58:39 03/17/2013 04:40:28 All 057 04/11/2013 05:52:06 04/13/2013 02:12:05 All 058 04/21/2013 06:33:02 04/23/2013 02:00:00 All 059 04/24/2013 21:13:05 04/26/2013 12:00:00 All 060 04/27/2013 21:43:47 04/28/2013 02:06:58 All 061 04/28/2013 12:10:43 04/28/2013 14:59:34 All 062 05/10/2013 18:34:28 05/11/2013 02:00:00 All 063 05/13/2013 15:30:16 05/14/2013 13:37:42 All 064 05/15/2013 03:28:50 05/15/2013 05:16:17 All 065 05/31/2013 19:40:00 06/01/2013 02:37:40 All 066 06/21/2013 03:08:22 06/25/2013 02:00:00 All 067 08/19/2013 22:29:50 08/22/2013 22:00:00 All 068 10/05/2013 06:27:55 10/07/2013 22:00:00 All 069 10/11/2013 06:33:02 10/16/2013 05:16:17 All 070 10/20/2013 06:02:20 10/20/2013 13:01:53 All 071 10/22/2013 20:32:00 10/23/2013 20:37:16 All 072 10/25/2013 07:29:00 10/27/2013 12:00:00 All 073 10/28/2013 04:09:00 10/31/2013 12:00:00 All 074 11/02/2013 04:35:00 11/03/2013 06:00:00 All 075 11/04/2013 05:46:00 11/05/2013 04:25:00 All 076 11/05/2013 21:43:00 11/05/2013 23:01:00 All 077 11/07/2013 10:48:00 11/09/2013 22:00:00 All 078 11/19/2013 09:57:00 11/21/2013 12:00:00 All 079 11/29/2013 03:59:00 11/29/2013 20:07:00 All 080 11/30/2013 02:37:00 12/02/2013 03:23:00 All 081 12/05/2013 11:34:00 12/05/2013 20:53:00 All 082 12/13/2013 20:06:00 12/15/2013 12:00:00 All 083 12/26/2013 03:13:00 12/31/2013 22:00:00 All 084 01/06/2014 07:19:05 01/11/2014 22:00:00 All 085 01/22/2014 03:59:32 01/23/2014 07:00:00 All 086 01/27/2014 22:00:00 01/31/2014 05:52:00 All 087 02/11/2014 03:03:15 02/11/2014 21:02:00 All 088 02/12/2014 06:07:27 02/12/2014 12:10:00 All 089 02/14/2014 15:45:00 02/15/2014 12:32:00 All 090 02/18/2014 00:29:45 02/19/2014 04:00:00 All 091 02/20/2014 07:00:00 02/21/2014 06:00:00 All 092 02/25/2014 03:44:11 03/05/2014 06:00:00 All 093 03/14/2014 21:28:00 03/14/2014 12:00:00 All 094 03/29/2014 16:41:00 03/30/2014 07:00:00 All 095 04/29/2014 19:09:00 04/29/2014 23:00:00 All 096 05/05/2014 14:44:00 05/05/2014 20:48:00 All 097 06/04/2014 19:24:00 06/05/2014 07:00:00 All 098 06/10/2014 11:19:00 06/10/2014 14:20:00 All 099 06/12/2014 21:38:00 06/13/2014 15:14:00 All 100 07/11/2014 12:56:46 07/11/2014 13:58:10 All 101 08/08/2014 12:05:36 08/09/2014 12:00:00 All 102 08/24/2014 11:45:00 08/24/2014 21:00:00 All 103 09/01/2014 08:35:00 09/07/2014 07:10:00 All 104 09/08/2014 20:00:00 09/09/2014 07:49:47 All 105 09/10/2014 16:41:00 09/13/2014 00:45:00 All 106 09/25/2014 00:55:00 09/28/2014 09:57:00 All 107 10/15/2014 14:49:00 10/17/2014 01:36:00 All 108 11/03/2014 09:11:00 11/05/2014 17:53:00 All 109 12/13/2014 10:59:00 12/23/2014 00:29:00 All 110 12/26/2014 09:15:00 12/27/2014 02:00:00 All 111 02/21/2015 09:32:00 02/23/2015 02:32:33 All 112 03/24/2015 08:20:29 03/28/2015 15:40:30 All 113 04/05/2015 04:25:07 04/05/2015 16:16:19 All 114 04/14/2015 00:24:38 04/16/2015 00:24:38 All It has been determined that the deadtime correction for nominal solar quiet conditions is minimal and is therefore not being applied. Deadtime remains an important uncorrected effect for periods of intense solar activity. However, those periods of intense solar activity, which are listed above, do not provide valid planetary data and are not used in the normal planetary data processing.
|
| CITATION_DESCRIPTION |
D. J. LAWRENCE (APL), MESSENGER E/V/H GRNS 3 NEUTRON SPECTROMETER CDR V2.0, MESS-E/V/H-GRNS-3-NS-CDR-V2.0, NASA Planetary Data System, 2016.
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| ABSTRACT_TEXT |
Abstract : This data set consists of the MESSENGER Neutron Spectrometer (NS) calibrated data records (CDRs). The NS experiment is a neutron spectrometer designed to observe spectra of neutrons emitted from Mercury's surface in the energy range from 0.01 eV to 7 MeV. There are five NS CDR data products: raw neutron spectra, NS counter data, galactic cosmic ray (GCR) spectra, engineering data, and gamma-ray burst data. This is version 2 of this data set; version 1 has been superceded.
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| PRODUCER_FULL_NAME |
DAVID LAWRENCE
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| SEARCH/ACCESS DATA |
Geosciences Web Services
Mercury Orbital Data Explorer
Geosciences Online Archives
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