GIOTTO PARTICLE IMPACT ANALYZER DUST MASS SPECTRA V1.0

Published by National Aeronautics and Space Administration | National Aeronautics and Space Administration | Metadata Last Checked: July 17, 2025 | Last Modified: 2025-07-17

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.

Find Related Datasets

Click any tag below to search for similar datasets

giotto halley

Complete Metadata

bureauCode	[ "026:00" ]
identifier	urn:nasa:pds:context_pds3:data_set:data_set.gio-c-pia-3-rdr-halley-v1.0_newb-de5q
issued	2021-05-21
landingPage	https://pds.nasa.gov/ds-view/pds/viewDataset.jsp?dsid=GIO-C-PIA-3-RDR-HALLEY-V1.0
programCode	[ "026:005" ]
references	[ "https://pds.nasa.gov" ]
theme	[ "Earth Science" ]