Physics
Scientific paper
Jan 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999georl..26..169h&link_type=abstract
Geophysical Research Letters, Volume 26, Issue 2, p. 169-172
Physics
4
Magnetospheric Physics: Solar Wind/Magnetosphere Interactions, Interplanetary Physics: Energetic Particles, Planetary, Solar
Scientific paper
We report measurements of ~150 keV proton intensity enhancements obtained at ACE and WIND when both spacecraft were upstream of the Earth's bow shock. We investigate differences in the onset times, the duration's, and the local magnetic field orientations for 4 events observed simultaneously at the two spacecraft. A simple statistical analysis shows only 2% of the simultaneous events could be random coincidences, which indicates that out of the 20 events observed at each spacecraft, the 4 simultaneous measurements are probably observations of the same events. Since these measurements were obtained when the two spacecraft were separated by distances >25 RE, these particles probably originate from a source region that possibly covers the scale size of the Earth's bow shock (~10 RE), and this is substantially larger than the smaller source regions proposed by existing models.
Desai Mihir I.
Dwyer Joesph R.
Gold Robert E.
Haggerty Dennis K.
Krimigis Stamatios M.
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