Physics
Scientific paper
Dec 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsh14a..05w&link_type=abstract
American Geophysical Union, Fall Meeting 2008, abstract #SH14A-05
Physics
2114 Energetic Particles (7514), 2124 Heliopause And Solar Wind Termination, 2144 Interstellar Gas, 2151 Neutral Particles (7837), 2152 Pickup Ions
Scientific paper
In 2007, the STE (SupraThermal Electron) sensors of the IMPACT instrument suite on the STEREO A and B spacecraft detected ~4-20 keV ENAs, most likely hydrogen, coming from the nose of heliosphere, with a wide (~60° in longitude), asymmetric double-peak source structure. These ENAs very likely originated from termination-shock-accelerated pickup ions in the heliosheath. Here we report on new STEREO A observations of heliosheath ENAs in 2008, a year later. We find generally the same ENA source structure - an asymmetric double peak straddling the nose of heliosphere, with the two peaks located at virtually same longitudes with comparable fluxes, on average. The observed ENA flux spectra also exhibit a similar double-power-law with a break at ~9-14 keV. Compared to 2007, the average ENA fluxes are almost the same in the direction of Voyage 1 (close to the major peak), while lower by a factor up to 2 in the direction of Voyager 2 (at the edge of ENA source). These observations indicate a rather steady ENA source in the heliosheath over a year, from 2007 to 2008. If the source is pickup ions accelerated at the termination shock, then their acceleration is quite stable. Furthermore, we will present STEREO B observations that are being taken in the next few months.
Lin Robert P.
Luhmann Janet G.
Wang Lanjuan
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