IMAGE/HENA: pressure and current distributions during the 1 October 2002 storm

P. C:son Brandt, E. C. Roelof, S. Ohtani, D. G. Mitchell and B. Anderson


Global energetic neutral atom images (ENA) of the EarthÕs ring current can be
used to derive the global ion and pressure distribution by applying a
constrained linear inversion technique. The ENA images are obtained in the 10Š60
keV range by the high energy neutral atom (HENA) onboard the IMAGE spacecraft.
We present ion and pressure distributions from the 1 October 2002 storm main
phase. The typical storm main phase displays a pressure peak around midnight at
L=3-4. We use this pressure distribution to compute the three-dimensional
electrical current system. The computed current system is then compared to the
region 2 current system obtained by the magnetometers on board the Indium
spacecraft. 

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Advances in Space Research, 33 (5), 719-722, 2004