Current Closure in the Ionosphere: Results from the ACES Sounding Rocket

Details Current Closure in the Ionosphere: Results from the ACES Sounding Rocket Current Closure in the Ionosphere: Results from the ACES Sounding Rocket

Dec 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsm43a1908k&link_type=abstract

American Geophysical Union, Fall Meeting 2010, abstract #SM43A-1908

Physics

[2704] Magnetospheric Physics / Auroral Phenomena, [2721] Magnetospheric Physics / Field-Aligned Currents And Current Systems, [2794] Magnetospheric Physics / Instruments And Techniques

Scientific paper

The Auroral Current and Electrodynamics Structure (ACES) rockets were launched into a substorm auroral arc, from Poker Flat Research Range, AK on January 29, 2009. The ACES rocket mission, in conjunction with the PFISR Radar, was designed to observe directly the three dimensional current system of an auroral arc during quiet-time conditions. ACES utilized two well instrumented payloads flown along very similar magnetic field footprints. The higher altitude payload (apogee 330 km) took in-situ measurements of the plasma parameters above the current closure region to provide the input signature into the lower ionosphere. The low altitude payload (apogee 130 km) took similar observations within the current closure region, where cross-field currents can flow. We present results comparing the electric and magnetic fields, density measurements and electron particle data on the two payloads. We examine these measurements to understand ionospheric conductivity and how energy is being deposited into the ionosphere through Joule heating. We further compare the plasma measurements between the high and low altitude payload to make inferences about current closure geometry.

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