Physics
Scientific paper
Dec 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agufmsm72d..02k&link_type=abstract
American Geophysical Union, Fall Meeting 2002, abstract #SM72D-02
Physics
2407 Auroral Ionosphere (2704), 2409 Current Systems (2708), 2411 Electric Fields (2712), 2455 Particle Precipitation
Scientific paper
In this study, we examine magnetic and electric field data taken from the NASA SIERRA multiple-payload rocket mission, which flew into a 100 nT auroral substorm at altitudes up to 735 km over the Poker Flat Research Range in Alaska on January 14, 2002. The SIERRA experiment was composed of three payloads synchronized with GPS and employing a new COWBOYS (COrnell Wire BOom Yo-yo System) electric field boom configuration. First we give an overview of the deployment, rough attitude, and geometry of our three-spacecraft system. We then show that the magnetic variations found on all three spacecraft magnetometers is consistent and that a field-aligned current interpretation of the magnetic variations is believable. The measured magnetic field gradients are shown to be correlated with precipitating electrons in typical inverted-V structures. Using accurate GPS positioning and timing and the magnetometer data from these multipoint observations, we infer current densities, assuming a static interpretation. We also examine the magnetic field variations for the presence of Alfvénic activity. Future work will be enabled once a full attitude solution is obtained for all three payloads, permitting the calculation of ∇x B and the DC-electric fields.
Kintner Paul M.
Klatt Eric M.
Lynch Kristina Anne
MacDonald Elizabeth A.
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