Data Set Information
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| DATA_SET_NAME |
VEGA1 TUNDE-M ENERGETIC PARTICLE ANALYSER DATA V1.0
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| DATA_SET_ID |
VEGA1-C-TNM-2-RDR-HALLEY-V1.0
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| NSSDC_DATA_SET_ID |
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| DATA_SET_TERSE_DESCRIPTION |
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| DATA_SET_DESCRIPTION |
Data Set Overview: TUNDE-M consists of two particle telescopes: T1 is viewing at 55 deg to the east of the Sun, T2 looks at 90 deg to the east of the Sun, both in the ecliptic plane. The telescopes consist of two circular surface barrier semiconductor detectors with an Al layer of 15x10**-6 g/cm** coated on the front detector (A) and an anticoincidence scintillation detector MCP. Low energy electrons (below about 160 keV) were deflected with a magnet. Field of view (half cone): 25 deg. Geometric factor: 0.25 cm**2 sr. Particles stopping in the thin front detector were not identified (they are referred as ion channels), those reaching the thick detector were identified via the dE/E method. T1 was working all along the mission, T2 was rendered inoperative before the Halley encounter. Modes of operation: Trassa-1 and Trassa-2 (cruise phase) and BRL (fast telemetry, started at 04:17:03 UT, March 6, 1986, ended at 08:24:53 UT, same day). Data were gathered in 66 channels, some referred as ions, others as identified particles, both between preset energy limits (given at the data set description). Data rate: 1 frame of 66 real numbers in every 4 s (BRL mode). The measurement was continuous, with an integration time of 4 s. The data were measured during the BRL seance on 6 March 1986. The data are listed as 62 records long blocks (time and 61 energy channels), blocks were obtained in every 4 s. The structure of the blocks is the following: 1st record - time in sec at the end of integration. To obtain the spacecraft time in UT, one has to add 4h 16m 59s to that number. 2nd to 62nd records (integer numbers): counts/4 s in the energy channels listed below (in channels 5 to 57 - from 6th to 58th record - the energies depend on the identity of the particles, they are given below both for protons and oxygen ions in keVs): rec 2 protons E : 3.2-4.5 MeV rec 3 protons E : 4.5-13 MeV rec 4 ions 20- 30 keV (noisy) rec 5 ions 30- 40 keV (noisy) nominal proton oxygen energy energy energy rec 6 ions 40- 50 49- 57 96-106 rec 7 50- 60 57- 70 106-125 rec 8 60- 70 70- 80 125-139 rec 9 70- 80 80- 91 139-153 rec 10 80- 90 91-100 153-164 rec 11 90-100 100-108 164-174 rec 12 100-110 108-117 174-184 rec 13 110-120 117-126 185-196 rec 14 120-130 126-136 196-209 rec 15 130-140 136-146 209-221 rec 16 140-150 146-160 221-238 rec 17 150-160 160-165 238-245 rec 18 160-170 165-172 245-254 rec 19 170-180 172-182 254-265 rec 20 180-190 182-188 265-274 rec 21 190-200 188-197 274-284 rec 22 200-210 197-212 284-302 rec 23 210-220 212-216 302-306 rec 24 220-230 216-231 306-324 rec 25 230-240 231-241 324-335 rec 26 240-250 241-260 335-342 rec 27 250-260 246-265 342-357 rec 28 260-270 260-272 357-366 rec 29 270-280 267-280 366-381 rec 30 280-290 280-286 381-388 rec 31 290-300 286-295 388-398 rec 32 300-310 295-304 398-408 rec 33 310-320 304-312 408-417 rec 34 320-330 312-324 417-431 rec 35 330-340 324-335 431-443 rec 36 340-350 335-349 443-458 rec 37 350-360 349-353 458-462 rec 38 360-370 353-360 462-471 rec 39 370-380 360-374 471-486 rec 40 380-390 374-383 486-496 rec 41 390-400 383-392 496-505 rec 42 400-410 392-402 505-516 rec 43 410-420 402-413 516-529 rec 44 420-430 413-425 529-542 rec 45 430-440 425-433 542-550 rec 46 440-450 433-444 550-562 rec 47 450-460 444-450 562-568 rec 48 460-470 450-467 568-586 rec 49 470-480 467-476 586-596 rec 50 480-490 476-487 596-607 rec 51 490-510 487-502 607-623 rec 52 510-160 502-527 623-650 rec 53 530-170 527-548 650-674 rec 54 550-180 548-568 674-695 rec 55 570-190 568-591 695-720 rec 56 590-100 591-608 720-738 rec 57 610-630 608-633 738-766 rec 58 630-3000 633-3000 738-3000 rec 59 electrons E : 160-300 keV rec 60 alpha E : 3-13 MeV/n rec 61 control rec 62 alpha or heavier > 13 MeV No processing has been applied to get the data other than computing counts from their m2**n form, where m is a <64 integer. The data set is continuous with one major data gap as given below: Time: CD data file end of frame (UT) first 8 4:17:07 last before data gap 2293 4:55:11 first 4446 5:31:05 last 14779 8:23:18
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| DATA_SET_RELEASE_DATE |
3000-01-01T00:00:00.000Z
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| START_TIME |
1986-03-06T04:17:07.000Z
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| STOP_TIME |
1986-03-06T08:23:18.000Z
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| MISSION_NAME |
VEGA 1
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| MISSION_START_DATE |
1984-12-15T12:00:00.000Z
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| MISSION_STOP_DATE |
1986-04-01T12:00:00.000Z
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| TARGET_NAME |
HALLEY
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| TARGET_TYPE |
COMET
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| INSTRUMENT_HOST_ID |
VEGA1
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| INSTRUMENT_NAME |
TUNDE-M ENERGETIC PARTICLE ANALYZER
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| INSTRUMENT_ID |
TNM
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| INSTRUMENT_TYPE |
PLASMA EXPERIMENT
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| NODE_NAME |
Small Bodies
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| ARCHIVE_STATUS |
ARCHIVED
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| CONFIDENCE_LEVEL_NOTE |
Confidence Level Overview:N/A
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| CITATION_DESCRIPTION |
Somogyi A.J., Gribov B.E., Kecskemety K. and A. V. Dyachkov, VEGA1 TUNDE-M ENERGETIC PARTICLE ANALYSER DATA V1.0, VEGA1-C-TNM-2-RDR-HALLEY-V1.0, NASA Planetary Data System, 1997
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| ABSTRACT_TEXT |
TUNDE-M consists of two particle telescopes: T1 is viewing at 55 deg to the east of the Sun, T2 looks at 90 deg to the east of the Sun, both in the ecliptic plane. The telescopes consist of two circular surface barrier semiconductor detectors with an Al layer of 15x10**-6 g/cm** coated on the front detector (A) and an anticoincidence scintillation detector MCP. Low energy electrons (below about 160 keV) were deflected with a magnet. Field of view (half cone): 25 deg. Geometric factor: 0.25 cm**2 sr. Particles stopping in the thin front detector were not identified (they are referred as ion channels), those reaching the thick detector were identified via the dE/E method.
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| PRODUCER_FULL_NAME |
INTERNATIONAL HALLEY WATCH
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| SEARCH/ACCESS DATA |
SBN Comet Website
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