Energetic Electrons and Ions Associated with the 19-25 May 2002 Solar Wind Event

Details Energetic Electrons and Ions Associated with the 19-25 May 2002 Solar Wind Event Energetic Electrons and Ions Associated with the 19-25 May 2002 Solar Wind Event

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agufmsh72c..06r&link_type=abstract

American Geophysical Union, Fall Meeting 2002, abstract #SH72C-06

Other

2111 Ejecta, Driver Gases, And Magnetic Clouds, 2118 Energetic Particles, Solar, 2139 Interplanetary Shocks, 2164 Solar Wind Plasma, 2451 Particle Acceleration

Scientific paper

The population of low energy ions (60 keV-5 MeV) and near-relativistic electrons (38-315 keV) measured by ACE/EPAM during the period of unusually low solar wind density following an interplanetary shock 10:16 UT on 23 May 2002 could initially be associated with a complex of solar flare and CME activity very late on 21 May and early on 22 May. The onset at ACE of a beam-like injection of near-relativistic electrons ~00:30 UT corresponded to a GOES-8 C9.7 xray flare beginning 23:14 UT with a maximum 00:30 UT in Region 9948 (S25W64). SOHO/LASCO images showed the launch of a pair of CMEs (extrapolated back to 1 R&sun; using their height-time profiles), one at 23:38 UT with a velocity of 888 km/s and the other at 03:27 UT with a velocity of 1199 km/s, both off the western limb at position angles ~230°. Thereafter, the electron intensities remained elevated and then began a gradual rise (as did the 2-5 MeV ion intensities which had not exhibited a prompt injection), culminating in an extraordinarily large electron and ion "spike" some 2 hours wide centered on the arrival of the interplanetary shock at 10:16 UT on 23 May. During most of the remainder of the day both the interplanetary magnetic field (IMF) and the energetic particles exhibited considerable variation, but when the IMF became remarkably quiet at 21:30 UT, so did the particle intensities, decaying very slowly and smoothly until a sudden drop ~2100 UT on 24 May. This period of quiet IMF and a ''reservoir'' of energetic particles corresponded to the period of lowest solar wind densities (<0.3/cc). While the IMF remained quiet for almost another day and the solar wind densities slowly recovered ~1800 UT on 25 May to ~2/cc, the drop in the energetic particle intensities a day earlier on 24 May coincided with the end of the post-shock high-speed solar wind stream as it abruptly dropped back to a nominal velocity of 400 km/s. Thus the energetic electron and ion populations were: 1) initially injected in association with a western flare and CME launches; 2) further accelerated dramatically by the interplanetary shock; and 3) decayed very slowly within the high-speed, low density, quiet IMF solar wind stream following the shock. The possible role in this sequence of events of the equatorial coronal hole that was rotating through the western hemisphere remains to be determined.

Affiliated with

Also associated with

No associations

Rating

Energetic Electrons and Ions Associated with the 19-25 May 2002 Solar Wind Event does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Energetic Electrons and Ions Associated with the 19-25 May 2002 Solar Wind Event, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Energetic Electrons and Ions Associated with the 19-25 May 2002 Solar Wind Event will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1437974