Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsh23b1962d&link_type=abstract
American Geophysical Union, Fall Meeting 2011, abstract #SH23B-1962
Astronomy and Astrophysics
Astrophysics
[7514] Solar Physics, Astrophysics, And Astronomy / Energetic Particles
Scientific paper
In the latter part of 2010, both Voyager 1 and Voyager 2 observed significant decreases of energetic particle intensity at energies 40keV-1MeV. The onset time and decay rate of this feature were very similar at both locations. Moreover, it was observed ~1 month earlier at Voyager 2 (which is not as deep into the heliosheath as Voyager 1), suggesting a large scale propagating temporal change in the heliosheath in the vicinity of the Voyagers (even though they are separated by ~130AU). During and subsequent to the period of this transient disturbance, the Interstellar Boundary Explorer (IBEX) was viewing Energetic Neutral Atom (ENA) emission (0.5-5 keV) from the region of the sky near the Voyagers, although the ENAs arrive months later due to the travel time from the heliosheath to 1 AU. In this study, we compare the ENA data taken by IBEX (0.5 to 5 keV) with the time-shifted in situ Voyager energetic ion observations ( >40 keV).
Decker Robert B.
DeMajistre Robert
Funsten Herbert O.
Janzen P. H.
Krimigis Stamatios M.
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