Physics – Plasma Physics
Scientific paper
Oct 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011jgra..11610105h&link_type=abstract
Journal of Geophysical Research, Volume 116, Issue A10, CiteID A10105
Physics
Plasma Physics
Interplanetary Physics: Interplanetary Shocks, Interplanetary Physics: Planetary Bow Shocks, Space Plasma Physics: Particle Acceleration, Space Plasma Physics: Shock Waves (4455)
Scientific paper
We use detailed multispacecraft observations to study the interaction of an interplanetary (IP) shock with the bow shock of the Earth on August 9-10, 1998. We can distinguish four different phases of particle acceleration in the shock-shock interaction: (1) formation of magnetic contact with IP shock and the seed population of energetic particles accelerated by it, (2) reacceleration of this population by the bow shock, (3) first order Fermi acceleration as the two shocks approach each other, and (4) particle acceleration and release as the shocks collide. Such a detailed analysis was made possible by the particularly advantageous quasi-radial interplanetary magnetic field configuration. To our knowledge this is the first time the last phase of acceleration at a shock-shock collision has been reported using in situ space plasma observations.
Agueda Neus
Andréeová Katerina
Hietala H.
Kilpua Emilia K. J.
Koskinen Hannu E. J.
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