SERSIO Sounding Rocket Thermal Ion Data

Details SERSIO Sounding Rocket Thermal Ion Data SERSIO Sounding Rocket Thermal Ion Data

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agufmsm51a0356f&link_type=abstract

American Geophysical Union, Fall Meeting 2004, abstract #SM51A-0356

Computer Science

Sound

2407 Auroral Ionosphere (2704), 2431 Ionosphere/Magnetosphere Interactions (2736), 2455 Particle Precipitation, 2467 Plasma Temperature And Density, 2494 Instruments And Techniques

Scientific paper

While the auroral phenomena of ion up/outflows in the dayside cusp-cleft region are often recognized, the mechanism creating this drift is not. The SERSIO (Svalbard EISCAT Rocket Study of Ion Outflows) sounding rocket mission was designed to probe possible sources of this energy transfer, such as joule heating, wave-particle interactions, and ambipolar fields. SERSIO was launched January 22, 2004 at 8:57UT from Ny-Alesund, Svalbard, Norway into an event simultaneously observed by the EISCAT radars. It reached an apogee of 790 km. Multiple ground cameras confirmed soft electron precipitation over the length of the trajectory while the radars showed increased ion velocity above 500km and enhanced electron temperature and density. The extensive suite of observations indicates the event was exceptional due to its intensity and 2.5 hr duration. Unfortunately, an attitude control system malfunction compromised much of the in situ data. Particle energy and temperature data were recoverable and compare well with the EISCAT profiles. Our instruments showed enhancements in the tail of the ion velocity distributions that were invisible to the radar. I will discuss the issues that arise when we measure the spacecraft potential with the thermal ion detectors and show that sphere-to-skin potentials are not a good measure of charging. Also of interest is the broader behavior of our thermal detectors including an investigation of a possible instrument energy cutoff and our future avenues of research.

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