Physics
Scientific paper
Jan 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009adspr..43..113b&link_type=abstract
Advances in Space Research, Volume 43, Issue 1, p. 113-119.
Physics
Scientific paper
We revisit the transient interplanetary events of January 1 and September 23, 1978. Using in-situ and remote sensing observations at locations widely separated in longitudes and distances from the Sun, we infer that in both cases the overall shock surface had a very fast “nose” region with speeds >900 and >1500 km-1 in the January and September events, respectively, and much slower flank speeds (˜600 km-1 or less), suggesting a shock surface with a strong speed gradient with heliospheric longitude. The shock-nose regions are thus likely efficient acceleration sites of MeV ions, even at 1 AU from the Sun. Our 3D magnetohydrodynamics modeling suggests that a 24° × 24° localized disturbance at 18 solar radii injecting momentum 100 times the background solar wind input over 1 h can produce a disturbance in semi-quantitative agreement with the observed shock arrival time, plasma density and velocity time series in the January 1978 event.
Berdichevsky Daniel B.
Bougeret Jean-Louis
Farrugia Charles J.
Lazarus Andrew J.
Lepping Ronald P.
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