IMAGE/LENA ISN Observations from 2003-2005: Implications for a Secondary Neutral Stream at 1 AU

Details IMAGE/LENA ISN Observations from 2003-2005: Implications for a Secondary Neutral Stream at 1 AU IMAGE/LENA ISN Observations from 2003-2005: Implications for a Secondary Neutral Stream at 1 AU

Dec 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsh14a..06f&link_type=abstract

American Geophysical Union, Fall Meeting 2008, abstract #SH14A-06

Physics

2144 Interstellar Gas, 2151 Neutral Particles (7837), 7837 Neutral Particles (2151), 7894 Instruments And Techniques

Scientific paper

The Imager for Magnetopause to Aurora: Global Exploration (IMAGE) spacecraft included a Low Energy Neutral Atom (LENA) imager that imaged neutrals in the energy range from about 10 eV to 300 eV. The imager used a tungsten conversion surface to convert low energy neutrals to negative ions. Higher energy neutrals were also detected by sputtering of negative ions (primarily water products) from the conversion surface. From December 2000 to about March 2001, a signal was observed in the LENA imager that was interpreted as a secondary stream of neutral atoms inside the heliosphere arriving from about 285 degrees ecliptic longitude. The primary neutral atom stream comes from ~254 degrees ecliptic longitude, or about 30 degrees away from this secondary stream. The interpretation of this secondary stream was based partly on the fact that the neutral atom flux peaked around 10 January 2001, which is about 30 days later than expected date for the peak flux for the primary neutral atom stream. To date, only the 2000-2001 and 2001- 2002 interstellar neutral atom observations have been analyzed. From 2002 to 2003, the spacecraft was in the ecliptic plane and background due to radiation belts was significant compared to the weak interstellar neutral signal. Here, fluxes from 2003-2004 and 2004-2005 are analyzed. The peak flux appears to be located near 10 January, in agreement with earlier observations. However, the final loss of the interstellar neutral signal from the LENA field of view in 2005 has important implications on the existence and properties of the secondary stream.

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