<?xml version="1.0" encoding="UTF-8"?> <Spase xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://www.spase-group.org/data/schema" xsi:schemaLocation="http://www.spase-group.org/data/schema http://www.spase-group.org/data/schema/spase-2_2_6.xsd"> <Version>2.2.6</Version> <Instrument> <ResourceID>spase://CDPP/Instrument/AMDA/IMP8/MAG</ResourceID> <ResourceHeader> <ResourceName>MAG</ResourceName> <AlternateName>IMP8 MAG</AlternateName> <ReleaseDate>2010-02-04T12:34:56.789</ReleaseDate> <Description>The magnetic field experiment on the IMP-8 spacecraft utilizes a tri-axial fluxgate (saturable inductor) magnetometer. The instrument originally had three, automatically determined, ranges, +/-12 nT, +/-36 nT, and +/-108 nT, full scale. Because of a range-change circuit failure occurring in early July 1975, the experiment was commanded into a fixed +/-36 nT range on July 11, 1975 at 12:55:09 UT and has been in that range ever since. The measurements are A-to-D converted onboard, to an 8-bit resolution, yielding +/-0.14 nT quantization sensitivity, which is larger than the intrinsic sensor noise level of 0.025 nT RMS. The data from the two-bit (per component) adaptive delta modulator, incorporated into the instrument, and applied to the intrinsic sample rate of 25 vectors/sec., was never utilized, and hence the rate of the full (8-bit) vector words, which occur every 320 ms, represents the effective sample period of the instrument. The sampling rate is synchronized to the spacecraft clock; the basic spacecraft clock frequency is 6.4 kHz. The sensor unit is mounted on the end of a boom approximately 4 m from the center of the spacecraft.</Description> <Acknowledgement>User will acknowledge the IMP-8 magnetometer team in any publication resulting from the use of these data.</Acknowledgement> <Contact> <PersonID>spase://SMWG/Person/Adam.Szabo</PersonID> <Role>PrincipalInvestigator</Role> </Contact> <InformationURL> <Name>IMP-8 Magnetometer Home Page</Name> <URL>http://lepmfi.gsfc.nasa.gov/mfi/imp8/imp8_hm.html</URL> <Description>A web site hosting IMP-8 magnetic experiment instrument information as well as web utilities for plotting and downloading data.</Description> </InformationURL> <InformationURL> <Name>NSSDC's Master Catalog</Name> <URL>http://nssdc.gsfc.nasa.gov/nmc/experimentDisplay.do?id=1973-078A-01</URL> <Description>Information about the Magnetic Field Experiment experiment on the IMP 8 mission.</Description> </InformationURL> </ResourceHeader> <InstrumentType>Magnetometer</InstrumentType> <InvestigationName>Magnetic Field Experiment</InvestigationName> <ObservatoryID>spase://CDPP/Observatory/AMDA/IMP8</ObservatoryID> </Instrument> </Spase>