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Polar Hydra Data AnalysisThe science activities are: 1) Hydra is still operating successfully on orbit. 2) A large amount of analysis and discovery has occurred with the Hydra ground data processing this past year. 3) Full interdetector calibration has been implemented and documented. This intercalibration was necessitated by the incorrect installation of bias resistors in the pre-acceleration stage to the electron channeltrons. This had the effect of making the counting efficiency for electrons energy dependent as well as channeltron specific. The nature of the error had no impact on the ion detection efficiency since they have a different bias arrangement. This intercalibration is so effective, that the electron and ion moment densities are routinely produced with a level of agreement better than 20%. 4) The data processing routinely removes glint in the sensors and produces public energy time spectrograms on the web overnight. 6) Routine, but more intensive computer processing codes are operational that determine for electrons and ions, the density, the flow vector, the pressure tensor and the heat flux by numerical integration. These codes use the magnetic field to sustain the quality of their output. To gain access to this high quality magnetic field within our data stream we have monitored Russell's web page for zero levels and timing files (since his data acquisition is not telemetry synchronous) and have a local reconstruction of B for our use. We have also detected a routine anomaly in the magnetometer data stream that we have documented to Chris Russell and developed an editing algorithm to intercept these "hits" and remove them from the geophysical analysis.
Document ID
19980107907
Acquisition Source
Goddard Space Flight Center
Document Type
Contractor Report (CR)
Authors
Scudder, J. D. (Iowa Univ. Iowa City, IA United States)
Hall, Van Allen (Iowa Univ. Iowa City, IA United States)
Date Acquired
September 6, 2013
Publication Date
January 1, 1998
Subject Category
Astronomy
Report/Patent Number
NASA/CR-1998-207563
NAS 1.26:207563
Funding Number(s)
CONTRACT_GRANT: NAG 5-2231
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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