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GIOTTO Particle Impact Analyzer (PIA) dust mass spectra of
1P/Halley
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Citation |
Kissel, J., and A.C. Raugh, GIOTTO PARTICLE IMPACT ANALYZER DUST
MASS SPECTRA V1.0, GIO-C-PIA-3-RDR-HALLEY-V1.0, NASA Planetary
Data System, 1990. |
Digital Object Identifier (DOI) |
Unable to retrieve DOI information. Please contact the PDS Help Desk for assistance.
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Data Set Abstract |
The PIA data was acquired in four modes of data compression,
termed mode 0 (the least compressed), and modes 1, 2, and 3, each
with increasing degrees of compression. With each spectrum are a
PIA assigned sequence number and event numbers, a unique
ID-number, instrument settings, and the relative approach time.
The PIA time is a 16-bit counter that starts with zero after
switch-on. As the Spacecraft Time Signal (STS) is used to reset
the internal PIA time counter, the TIM highest possible value is
48960 counts. STS-pulses are given after the transimssion of 256
formats. This results for format F1/F2 and high bitrate (46080
bps) in 5802.67 s. (= 256 formats * 64 frames * 2040 bytes * 8
bit/byte/46080 bps) The time resolution is DTIM = 1/ (138240 HZ
/2**14 ) = 0.1185 s. Each STS defines the time for an event with
TIM = 0. Therefore, SCET = GRT(STS) + (TIM * DTIM) - propogation
delay (8:00.1 sec). where SCET = Spacecraft Event Time, GRT =
Ground Reception Time. |
Search/Access Data |
SBN Comet Website
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Additional Information |
Mission Information |
GIOTTO
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Data Set Information |
GIO-C-PIA-3-RDR-HALLEY-V1.0 |
Instrument Host Information |
GIO
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Instrument Information |
PIA
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Target Information |
HALLEY
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