IMP 8 UMD EECA 10.92m Rates, PHA

2021-03-11 18:39:11Z

This data set, from the Electrostatic Energy-Charge Analyzer (EECA) part of the U. Maryland experiment on IMP 8, contains count rate and pulse height data enabling the computation of 10.92-min resolution fluxes of: singly ionized ions in 5 energy/charge windows of lower limits between 130 and 740 keV/Q; doubly charged ions in the same 5 keV/Q windows plus another at 65 keV/Q; ions with charge states between 5 and 8 in the same 6 keV/Q windows as for doubly charged ions plus another at 37 keV/Q; ions with charge states above about 10 at 37 and 65 keV/Q windows; 600-860 keV electrons. Some of the modes are spin integrated while others are given in 90 deg quadrants about the spacecraft spin vector (which is normal to the ecliptic plane). The data set was created at NSSDC from the U.Md.-provided "summary tapes" (NSSDC IDs SPHE-00170 and 73-078A-03C) by dropping engineering data, dropping data from the ULET portion of the overall experiment (the ULET instrument failed in 1978), and converting the remaining time, spacecraft position, and EECA instrument data from binary to ASCII representation. The data are available via ftp in 1- month files of variable lengths in the 3-6 MB size range.

Please acknowledge the successive PI's George Gloeckler, and Fred Ipavich.

	Role	Person	StartDate	StopDate	Note
1.	PrincipalInvestigator	spase://SMWG/Person/George.Gloeckler
2.	PrincipalInvestigator	spase://SMWG/Person/Fred.M.Ipavich

spase://VEPO/NumericalData/IMP8/EECA/PT11M

spase://VSPO/NumericalData/IMP8/EECA/PT11M

spase://SMWG/Repository/NASA/GSFC/SPDF

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Please acknowledge the successive PI's, George Gloeckler, Fred Ipavich, and NSSDC and SPDF.

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Spin Integrated Counts

This parameter contains five data words for each of six charge state - energy/charge (or species - energy range) combinations. The five words are (a) number of good readouts, (b) number of bad readouts, (c) total spin-integrated counts, (d) sum of squares of readout-specific counts, (e) accumulation times in seconds. Charge state - energy/charge and species - energy range combinations are specified in the "elements" below, where only the "counts" word is called out explicitly.

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Sectored and spin-integrated Counts

This parameter contains nine data words for each of nine charge state - energy/charge (or species - energy range) combinations. The nine words are (a) number of good readouts, (b) number of bad readouts, (c) total spin-integrated counts for all readouts and sectors, (d) sum of squares of readout-specific, sector-specific counts, (e) accumulation time per sector, in seconds, (f) total counts in 90-deg sector 1, (g ) total counts in 90-deg sector 2, (h) total counts in 90-deg sector 3, (i) total counts in 90-deg sector 4. Charge state - energy/charge combinations are specified in the "elements" below, where only the "sector 1 counts" word is called out explicitly.

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Distribution of arrival directions of pulse-height-analyzed particles

This parameter contains ten data words for each of ten charge state - energy/charge combinations. (For each particle analyzed, maximum of one per 1.28s, the spacecraft spin phase to the nearest 45 deg is captured.) The ten words are (a) number of legal events, (b) number of illegal events, (c through j) counts of events analyzed in sectors 0 through 7, respectively. Charge state - energy/charge combinations are specified in the "elements" below, where only the "sector 0 counts of events analyzed" word is called out explicitly.

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Counts of events analyzed, by event type and charge group

This parameter contains 33 counts of events analyzed, after pulse height analysis has enabled charge group separations for each of the ten "event types" listed in the preceding parameter array; see the names of the elements of that array for the event type labels (e.g., P1) used below. Note that of the 33 event counts, only 20 correspond to meaningful charge groups, while 13 correspond to background rates that are labelled as BG-low (low discriminator channels) or BG-High (high discriminator channels). Above-referenced documentation contains a mapping of discriminator channels to charge groups and background effect, for each of the 10 "event types." Spin phase information is not retained in these 33 event counts.

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Spacecraft position vector

GSE X,Y,Z components of spacecraft position vector, in km.

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