Angular Distribution of Neutral Atoms in the Solar Wind on October 24 & 31, 2003

Details Angular Distribution of Neutral Atoms in the Solar Wind on October 24 & 31, 2003 Angular Distribution of Neutral Atoms in the Solar Wind on October 24 & 31, 2003

May 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agusmsm41a..01v&link_type=abstract

American Geophysical Union, Spring Meeting 2005, abstract #SM41A-01

Physics

2151 Neutral Particles, 2164 Solar Wind Plasma, 2728 Magnetosheath, 2784 Solar Wind/Magnetosphere Interactions

Scientific paper

In 2003, during intervals of magnetospheric compression on October 24 and 31, the IMAGE spacecraft was in the solar wind, upstream of the Earth's bow shock. While in the solar wind, the Low Energy Neutral Atom (LENA) instrument detected an unusually wide and intense angular distribution of energetic neutral hydrogen centered about the solar direction. These measurements resemble LENA's repeated observation of a narrower, less intense energetic neutral atom (ENA) distribution, thought to result from charge exchange interactions between magnetosheath ions and geocoronal hydrogen. The uniqueness of these excursions into the solar wind results from the changing IMAGE orbit; the line of apsides of the precessing orbit was only briefly near the Sun-Earth line, with an apogee of 8 RE toward the Sun, the most favorable orientation for entry into the solar wind. We investigate the ion populations present during the 2003 events, including those detected at IMAGE by the HENA instrument and upstream at ACE with the SWEPAM and ULEIS instruments. We consider solar wind and suprathermal ions that charge exchange with geocoronal hydrogen as potential ENA sources and model the resultant ENA distribution. We will report on the likely source of these ENAs in the solar wind, with particular attention to understanding their angular distribution.

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