Seasonal variation of solar wind ENA as a measure of interstellar gas in the inner solar system

Details Seasonal variation of solar wind ENA as a measure of interstellar gas in the inner solar system Seasonal variation of solar wind ENA as a measure of interstellar gas in the inner solar system

May 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agusm..sh31b04c&link_type=abstract

American Geophysical Union, Spring Meeting 2001, abstract #SH31B-04

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2151 Neutral Particles

Scientific paper

The Low Energy Neutral Atom (LENA) imager, launched on the Imager for Magnetopause to Aurora Global Exploration (IMAGE) spacecraft in March of 2000, detects neutral atoms with energies as low as 10 ~eV up to the range of solar wind above 1 ~keV. Because LENA has low sensitivity to light and it looks directly at the Sun every spin when the Sun is in the field of view, it has observed a neutral component of the solar wind that results when solar wind ions charge exchange with interstellar neutrals, dust and the Earth's geocorona. In this study, we examine long term variations, over a period of about a year, in the intensity of the Sun pulse. Initial results suggest the count rate reached a maximum between June and July of the year 2000 with a long, low count-rate period stretching from mid-November through at least early March. The peak may be due to the solar wind interaction with interstellar neutrals. Charge exchange between the solar wind and the interstellar neutrals (creating a neutral solar wind beam) is maximum in June when the Earth is upstream of the Sun in the interstellar flow and is minimum when the Earth is downstream of the Sun in the interstellar flow. Other possibilities will also be examined

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