Other
Scientific paper
May 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agusmsh51a..13t&link_type=abstract
American Geophysical Union, Spring Meeting 2004, abstract #SH51A-13
Other
2139 Interplanetary Shocks, 2149 Mhd Waves And Turbulence, 7511 Coronal Holes, 7514 Energetic Particles (2114), 7851 Shock Waves
Scientific paper
Using GEOTAIL data, we study interplanetary shock (IPS) events and related phenomena in the solar storm season in 28 October - 6 November 2003. Four IPSs detected by GEOTAIL are, (1) ~02 UT on 28 October, (2) ~06 UT on 29 October, (3) ~06 UT on 4 November, and (4) ~20 UT on 6 November. (Another strong IPS detected by ACE at ~16 UT on 30 October came was not seen by GEOTAIL since GEOTAIL was in the magnetosphere.) While IPS-1 and IPS-4 were relatively weak shock, IPS-2 was the fastest shock (average speed of ~2200 km/s) ever detected by GEOTAIL. IPS03 was a moderately strong IPS with average speed of ~1100 km/s. From the viewpoint of nonthermal particle acceleration, we are most interested in IPS-2 and related phenomena. Unfortunately, since the background of SEPs (solar energetic particles) above 10 MeV during the IPS-2 event was fourth-strongest in the satellite record, the low energy ion detector LEP/EAi was masked for the most of the event. However, from other instruments including the low energy electron detector LEP/EAe, the solar wind ion detector LEP/SWi, energetic particle and ion composition EPIC, the magnetic field detector MGF, the plasma wave instrument PWI, the electric field instrument EFD we could obtain valuable data for this interesting IPS event. We will discuss (1) local shock properties (such as the shock angle, propagation speed, and compression ratio), (2) activity of waves resonating with energetic protons as well as energetic electrons, and (3) particle acceleration and possible `cosmic-ray-mediated' feature, namely preacceleration of the solar wind in the foreshock region ahead of the IPS.
Hayakawa Hisao
Ishisaka K.
Kasaba Yasumasa
Keika Kunihiro
Kojima Hedeyasu
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