Interstellar Neutral Atoms at 1 AU Observed by the Image/Lena Imager

Details Interstellar Neutral Atoms at 1 AU Observed by the Image/Lena Imager Interstellar Neutral Atoms at 1 AU Observed by the Image/Lena Imager

Jun 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009apj...698.1117f&link_type=abstract

The Astrophysical Journal, Volume 698, Issue 2, pp. 1117-1121 (2009).

Astronomy and Astrophysics

Astronomy

Ism: Structure, Interplanetary Medium, Space Vehicles: Instruments

Scientific paper

Observations from the Imager for Magnetopause to Aurora: Global Exploration (IMAGE) Low Energy Neutral Atom (LENA) imager from 2005 are used to investigate characteristics of interstellar neutrals in the inner solar system. The LENA imager detected an interstellar neutral signal starting in 2004 December and extending to early 2005 April. Using the orientation of the field of view of the imager and the date of the loss of the interstellar neutral signal, it is concluded that the signal is consistent with a relatively compact (several degrees wide in ecliptic latitude and longitude) source of neutral helium and/or energetic (>150 eV) hydrogen originating from the solar apex direction. Observations later in 2005 are used to distinguish the composition and conclude that the relatively compact source likely contains some energetic hydrogen (in addition to the helium).

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