Data Set Information
DATA_SET_NAME VEGA2 PLASMAG-1 PLASMA ENERGY ANALYSER DATA V1.0
DATA_SET_ID VEGA2-C-PM1-2-RDR-HALLEY-V1.0
NSSDC_DATA_SET_ID
DATA_SET_TERSE_DESCRIPTION
DATA_SET_DESCRIPTION Data Set Overview: The PLASMAG-1 instument package included six different sensors:A0 plasma impact detector for measuring neutral particle flux, (manufactured by R. Grard, ESA/ESTEC, Noordwijk, The Netherlands)A1 Faraday cup for measuring integral ion flux from solar direction,A2 Faraday cup for measuring integral ion flux and neutral particles from ram direction,A3 spherical electrostatic analyzer for measuring ions from ram direction in the energy range of 15 eV - 3.6 keV in 120 logarithmically spaced channels,A4 spherical electrostatic analyzer for measuring ions from solar direction in the energy range of 60 eV - 30 keV in 60 logarithmically spaced channels,A5 cylindrical electrostatic analyzer for measuring ions perpendicular to the ecliptic plane in the energy range of 2 eV - 10 keV in 30 logarithmically spaced channels. The sensitivity of the electron analyzer A5 was very low. Detector A3 of Vega-2 was fatally damaged 2.5 min before closest approach. The channeltrons of A3 were saturating at higher count rates. Field of view of the detectors: A1: 90x90 deg (centered on solar direction), A2: 26x26 deg (centered on ram direction), A3: 32x12 deg (centered on ram direction), A4: 36x32 deg (centered on solar direction), A5: 7x7 deg (perpendicular to ecliptic plane). Effective apperture: A1: 1.6 cm**2 A2: 0.93 cm**2 A3: 0.0193 cm**2 A4: 0.00455 cm**2 A5: 0.0036 cm**2 Energy resolution: A3: 3.2 % A4: 3.85% A5: 7.5 % One complete spectrum was taken by A3, A4, and A5 in every second during the BRL (high telemery rate) seance. Sampling times for each energy channel: A3: 0.005 sec A4: 0.005 sec A5: 0.021 sec During the cruise phase data were recorded by an on-board magnetometer at lower telemetry rate. The data were measured during the BRL seance on March 9, 1986. 1. parameter: time in sec - end of a 10 sec averaging interval (0 sec is 4:00 UT in spacecraft time)2-30. parameters: count rates observed by A5 (electrons)31-90. parameters: count rates observed by A4 (ions from solar direction)91-210. parameters: count rates observed by A3 (ions from ram direction) The energy levels for the 29 channels of detector A5 in eV: 1.9 2.9 3.8 5.8 7.7 10.6 14.9 19.2 25.9 35 0 47.0 61.0 84.5 113.3 168.2 229.7 311.3 410.9 553.0 744 8 999.2 1349.0 1804.8 2430.2 3225.2 4364.7 5869.97868.0 10571.0 The energy levels for the 60 channels of detector A4 in eV: 64.0 73.8 78.7 88.6 94.3 103.3 114.0 128.7 138.6 154 2 173.8 188.6 209.1 235.3 255.0 286.2 317.3 351.0 387.0 431 3 480.5 534.6 594.5 660.9 734.7 818.4 912.7 1014.3 1123.4 1246 4 1384.2 1531.8 1689.2 1877.8 2099.2 2341.1 2606.0 2896.2 3214.4 3575 2 3985.2 4436.2 4936.4 5494.0 6117.2 6724.0 6724.0 7544.0 8388.6 9290 6 10291.0 11439.0 12783.8 14268.0 15924.4 17728.4 19647.2 21861.224403.2 27191 2 The energy levels for the 120 channels of detector A3 in eV: 15.6 17.2 18.9 19.7 20.5 22.1 23.0 24.6 27.1 28 3 29.5 30.8 32.0 33.2 34.4 35.7 36.9 38.1 39.4 40 6 41.8 43.5 45.1 45.9 46.7 48.0 50.0 51.3 52.5 54 9 57.4 59.4 61.5 64.0 66.8 69.7 73.0 76.7 80.8 84 9 89.4 93.9 98.4 102.9 107.4 112.3 117.7 123.0 128.7 134 5 140.6 147.2 154.2 161.5 169.3 177.1 185.3 194.3 203.8 213 2 223.0 234.1 245.6 257.5 269.8 282.9 296.4 310.0 323.9 337 8 352.2 366.5 381.3 398.5 418.2 440.3 464.1 487.9 512.5 537 1 561.7 587.9 615.8 645.3 676.5 710.9 747.8 787.2 828.2 870 8 914.3 959.4 1005.3 1052.9 1102.1 1152.1 1203.8 1262.01325.1 1393 1 1466.2 1539.1 1612.9 1687.6 1763.0 1845.0 1935.2 2033.62140.2 2248 4 2358.3 2469.8 2583.8 2702.7 2829.8 2966.8 3112.7 3268.53432.5 3604 7 Measurements were performed in every sec, data provided here are 10 sec averages. Time of first observation: 4:13:00 UT Time of first data in file: 4:13:10 UT (790 sec) Time of last observation: 8:40:00 UT Time of last data in file: 8:40:00 UT (16800 sec) There was a data gap between 7:17:30 UT (11850 sec) and 7:45:10 (13510 sec). Missing or bad data: -99 The detector A3 was fatally damaged at 7:17:31 UT when the telemetry connection also broke down. At 7:45:10 UT the connection with the instrument was re-established.
DATA_SET_RELEASE_DATE 3000-01-01T00:00:00.000Z
START_TIME 1986-03-09T04:13:00.000Z
STOP_TIME 1986-03-09T08:40:00.000Z
MISSION_NAME VEGA 2
MISSION_START_DATE 1984-12-21T12:00:00.000Z
MISSION_STOP_DATE 1986-04-01T12:00:00.000Z
TARGET_NAME HALLEY
TARGET_TYPE COMET
INSTRUMENT_HOST_ID VEGA2
INSTRUMENT_NAME PLASMA ENERGY ANALYZER
INSTRUMENT_ID PM1
INSTRUMENT_TYPE ELECTROSTATIC ANALYZER
NODE_NAME Small Bodies
ARCHIVE_STATUS ARCHIVED
CONFIDENCE_LEVEL_NOTE Confidence Level Overview : N/A
CITATION_DESCRIPTION Dyachkov, A. V., VEGA2 PLASMAG-1 PLASMA ENERGY ANALYSER DATA V1.0, VEGA2-C-PM1-2-RDR-HALLEY-V1.0, NASA Planetary Data System, 1997
ABSTRACT_TEXT The PLASMAG-1 instument package included six different sensors: A0 plasma impact detector for measuring neutral particle flux, (manufactured by R. Grard, ESA/ESTEC, Noordwijk, The Netherlands) A1 Faraday cup for measuring integral ion flux from solar direction, A2 Faraday cup for measuring integral ion flux and neutral particles from ram direction, A3 spherical electrostatic analyzer for measuring ions from ram direction in the energy range of 15 eV - 3.6 keV in 120 logarithmically spaced channels, A4 spherical electrostatic analyzer for measuring ions from solar direction in the energy range of 60 eV - 30 keV in 60 logarithmically spaced channels, A5 cylindrical electrostatic analyzer for measuring ions perpendicular to the ecliptic plane in the energy range of 2 eV - 10 keV in 30 logarithmically spaced channels.
PRODUCER_FULL_NAME INTERNATIONAL HALLEY WATCH
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