Data Set Information
DATA_SET_NAME IHW COMET HALLEY POLARIMETRIC OBSERVATIONS V1.0
DATA_SET_ID IHW-C-PPOL-3-RDR-HALLEY-V1.0
NSSDC_DATA_SET_ID
DATA_SET_TERSE_DESCRIPTION
DATA_SET_DESCRIPTION Data Set Overview : NASA's International Halley Watch (IHW) has created a Comet Halley Archive. The collection of data spans the full wavelength range as submitted by scientists to the IHW. The observations belong to one of the following Disciplines: Amateur, Astrometry, Infrared Studies, Large-Scale Phenomena, Meteor Studies, Near-Nucleus Studies, Photometry and Polarimetry, Radio Studies, and Spectroscopy and Spectrophotometry. The data collected by these nine disciplines were augmented by Spacecraft measurements. The data were submitted to IHW, but the evaluation and selection for the Archive has been the primary responsibility of the Discipline Specialist Teams for each network in cooperation with the Lead Center. The Photometry and Polarimetry Network collected 884 polarimetric observations for the Polarimetry Subnetwork. The majority of these observations (752) are expressed as 'percent polarization'. These data span the dates from 1985 September 13 through 1986 May 17. Processing Level Id : 3 Software Flag : N Parameters : Data Set Parameter Name : POLARIZATION Data Set Parameter Unit : PERCENT Description ----------- Polarization is a measure of the orientation of the electric (or magnetic) vectors in electromagnetic radiation. In general , an electromagnetic wave is elliptically polarized with the electric vector, as seen by a stationary observer, tracing out an ellipse. This can be decomposed into circular polarization and linear polarization which are the components normally measured. Linear polarization is specified as the orientation of the electric vector (+/- 180 degrees). In the IHW data sets, the orientation of linear polarization is specified relative to the plane of scattering (the plane containing Sun, Comet, and Earth), 0 for electric vectors parallel to the plane of scattering and 90 for electric vectors perpendicular to the plane of scattering. Other conventions are used in other branches of astronomy. Circular polarization is specified as left hand if the electric vector of an approaching wave rotates clockwise as seen by a stationary observer and as right hand if it rotates counter-clockwise. This is the opposite of the convention used by physicists but corresponds to that used by radio engineers. Unpolarized light is a superposition of orthogonally polarized waves (left and right circular or orthogonal linear components). The degree of polarization, usually expressed as a percentage, is the fraction of the total radiation which is completely polarized. Source Instrument Parameters : Instrument Host ID : PPN Data Set Parameter Name : POLARIZATION Instrument Parameter Name : N/A Important Instrument Parameters : 0 Measurement Information : Atmospheric Conditions ---------------------- N/A Source ------ N/A Calibration Standard -------------------- N/A Wavelength Calibration ---------------------- N/A Processing : N/A
DATA_SET_RELEASE_DATE 1992-09-30T00:00:00.000Z
START_TIME 1985-09-13T10:19:12.000Z
STOP_TIME 1986-05-17T05:18:31.680Z
MISSION_NAME INTERNATIONAL HALLEY WATCH
MISSION_START_DATE 1980-09-01T12:00:00.000Z
MISSION_STOP_DATE 1992-09-30T12:00:00.000Z
TARGET_NAME HALLEY
TARGET_TYPE COMET
INSTRUMENT_HOST_ID PPN
INSTRUMENT_NAME POLARIMETRY DATA
INSTRUMENT_ID PPOL
INSTRUMENT_TYPE POLARIMETER
NODE_NAME Small Bodies
ARCHIVE_STATUS ARCHIVED
CONFIDENCE_LEVEL_NOTE Overview : N/A
CITATION_DESCRIPTION Citation TBD
ABSTRACT_TEXT NASA's International Halley Watch (IHW) has created a Comet Halley Archive. The collection of data spans the full wavelength range as submitted by scientists to the IHW. The observations belong to one of the following Disciplines: Amateur, Astrometry, Infrared Studies, Large-Scale Phenomena, Meteor Studies, Near-Nucleus Studies, Photometry and Polarimetry, Radio Studies, and Spectroscopy and Spectrophotometry. The data collected by these nine disciplines were augmented by Spacecraft measurements. The data were submitted to IHW, but the evaluation and selection for the Archive has been the primary responsibility of the Discipline Specialist Teams for each network in cooperation with the Lead Center. The Photometry and Polarimetry Network collected 884 polarimetric observations for the Polarimetry Subnetwork. The majority of these observations (752) are expressed as 'percent polarization'. These data span the dates from 1985 September 13 through 1986 May 17.
PRODUCER_FULL_NAME GRAYZECK, E.J., KLINGLESMITH, D.A., III, NIEDNER, M.B., JR
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