Physics – Plasma Physics
Scientific paper
Dec 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsh13b1522r&link_type=abstract
American Geophysical Union, Fall Meeting 2009, abstract #SH13B-1522
Physics
Plasma Physics
[2126] Interplanetary Physics / Heliosphere/Interstellar Medium Interactions, [2152] Interplanetary Physics / Pickup Ions, [2164] Interplanetary Physics / Solar Wind Plasma, [7859] Space Plasma Physics / Transport Processes
Scientific paper
The Solar Wind Around Pluto (SWAP) instrument aboard the NASA New Horizons spacecraft measured ions from ~11.2 to ~11.8 AU in the ecliptic plane in late 2008. We analyze about 25 one day (nominally) integrations of the combined distribution function of these ions from ~20 eV/e to 7.5 keV/e. In conjunction with these histograms, we report statistics on pseudo-moments computed for each hour. This auxiliary data provides a measure of the variability of the solar wind during the integration time of the histograms. Initial results indicate that the variability in the bulk speed appears to widen the histogram distribution, which artificially increases temperatures estimated from the histograms. In general, the pickup ions appear to be highly organized by the bulk solar wind speed, consistent with previous reports; however, there is a great deal of variability between these histograms. We intend to search for factors that will order this variability such as stream structure in the solar wind.
Elliott Heather Alison
McComas David John
Randol Burton
Schwadron Nathan A.
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