A Tomographic Reconstruction Technique Applied to the GPS TEC Data

Details A Tomographic Reconstruction Technique Applied to the GPS TEC Data A Tomographic Reconstruction Technique Applied to the GPS TEC Data

Nov 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006ihy..worke..56k&link_type=abstract

2nd UN/NASA Workshop on International Heliophysical Year and Basic Space Science. Proceedings of the conference held 27 Novembe

Astronomy and Astrophysics

Astrophysics

Scientific paper

ekassie@ucla.edu An image of the dayside low-energy ion outflow event that occurred on 16 December 2003 was constructed with ground- and space-based GPS (Global Positioning System). Total Electron Content (TEC) data and ion drift meter data from the DMSP (Defense Metrological Satellite Program). A tomographic reconstruction technique has been applied to the GPS TEC data obtained from the GPS receiver on the Low Earth Orbit (LEO) satellite FedSat. The two dimensional tomographic image of the topside ionosphere and plasmasphere reveals a spectacular beam-like dayside ion outflow emanating from the cusp region. These outflows are associated with heating due to low-energy precipitating electrons. The transverse components of the magnetic field in the NewMag data show the presence of FAC (field aligned current) sheets, indicating the existence of low energy electron precipitation in the cusp region. The DMSP ion drift data show upward ion drift velocities and upward fluxes of low energy ions and electrons at the orbiting height of the DMSP spacecraft in the cusp region. This study presents the first image of the flux tube structure of ionospheric ion outflows from 0.13 Re up to 3.17 Re altitude.

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