IMAGE/HENA: ENA Observation of a Substorm Onset

Details IMAGE/HENA: ENA Observation of a Substorm Onset IMAGE/HENA: ENA Observation of a Substorm Onset

May 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agusm..sm42c01c&link_type=abstract

American Geophysical Union, Spring Meeting 2001, abstract #SM42C-01

Physics

2730 Magnetosphere--Inner, 2740 Magnetospheric Configuration And Dynamics, 2760 Plasma Convection, 2778 Ring Current, 2784 Solar Wind/Magnetosphere Interactions

Scientific paper

We present ENA images from above the north pole of a substorm onset on the 24 September, 2000. ENA emission appears at 1532 UT around L=6 at local midnight while Pi2 pulsations are observed at local midnight at approximately 1538 UT. The ENA emission is not visible above 40 keV due to the fall off of the charge exchange cross section with energy. However, there is no ENA emission below 16 keV for this event, which then is a representation of a decrease in the low energy end of the ion spectrum. We will relate the ion distribution derived from the ENA images to in-situ ion data. The ENA images implies that the onset for this event starts on, at least, L=6. The decrease of the hydrogen geocorona with altitude makes any ENA emissions from higher altitudes weak and difficult to detect. We will try to put an upper limit on the onset region.

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