Suprathermal proton and alpha-particle spikes (E/e = 6.5--225 keV/e) observed by the WIND-SMS experiment near the libration point L1

Details Suprathermal proton and alpha-particle spikes (E/e = 6.5--225 keV/e) observed by the WIND-SMS experiment near the libration point L1 Suprathermal proton and alpha-particle spikes (E/e = 6.5--225 keV/e) observed by the WIND-SMS experiment near the libration point L1

Aug 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001icrc....9.3596k&link_type=abstract

Proceedings of the 27th International Cosmic Ray Conference. 07-15 August, 2001. Hamburg, Germany. Under the auspices of the Int

Physics

Scientific paper

The present study deals with suprathermal proton (E/q = 6.5-225 keV/e) and α-particle spikes measured by the WIND-SMS experiment in the interplanetary space. They reach up to ≈ 5-20 times the solar wind speed and last from a few minutes up to ≈ 30 minutes. Measurements obtained simultaneously by the Solar Wind Ion Composition Sensor SWICS (E/q = 0.5-31.5 keV/e) were also available for this study. In order to exclude particles escaping from the magnetosphere or accelerated by interplanetary shocks and corotating interaction regions we selected ions which were associated with a distinct decrease of the interplanetary magnetic field magnitude and changes of the azimuthal and tangential field direction. We interprete these signatures as manifestation of a reconnection process. While it is known that reconnection processes occur in the interplanetary magnetic field, we show for the first time that suprathermal particles can be accelerated up to ≈ 100 keV/e in the interplanetary space during such processes.

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