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C/NOFS Measurements of Stormtime Magnetic Perturbations in the Low-latitude IonosphereThe Vector Electric Field Investigation suite on the C/NOFS satellite includes a fluxgate magnetometer to monitor the Earth's magnetic fields in the low-latitude ionosphere. Measurements yield full magnetic vectors every second over the range of +/- 45,000 nT with a one-bit resolution of 1.37 nT (16 bit AID) in each component. The sensor's primary responsibility is to support calculations of both VxB and ExB with greater accuracy than can be obtained using standard magnetic field models. The data also contain information about large-scale current systems, that, when analyzed in conjunction with electric field measurements, promise to significantly expand understanding of equatorial electrodynamics. We first compare in situ measurements with the POMME (POtsdam Magnetic Model of the Earth) model to establish in-flight sensor "calibrations" and to compute magnetic residuals. At low latitudes the residuals are predominately products of the stormtime ring current. Since C/NOFS provides a complete coverage of all local times every 97 minutes, magnetic field data allow studies of the temporal evolution and local-time variations of stormtime ring current. The analysis demonstrates the feasibility of using instrumented spacecraft in low-inclination orbits to extract a timely proxy for the provisional Dst index and to specify the ring current's evolution.
Document ID
20120016754
Acquisition Source
Goddard Space Flight Center
Document Type
Conference Paper
Authors
Le, Guan (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Burke, William J. (Air Force Research Lab. Hanscom AFB, MA, United States)
Pfaff, Robert F. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Freudenreich, Henry (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Maus, Stefan (National Geophysical Data Center Boulder, CO, United States)
Luehr, Hermann (GeoForschungsZentrum Potsdam, Germany)
Date Acquired
August 26, 2013
Publication Date
August 13, 2012
Subject Category
Geophysics
Report/Patent Number
GSFC.ABS.6660.2012
Meeting Information
Meeting: Asia Oceania Geosciences Society and American Geophysical Union (Western Pacific Geophysics Meeting) AOGS = AGU (WPGM) Joint Assembly
Location: Sentosa Island
Country: Singapore
Start Date: August 13, 2012
End Date: August 17, 2012
Distribution Limits
Public
Copyright
Public Use Permitted.

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