Physics
Scientific paper
Apr 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009eguga..11.1465m&link_type=abstract
"EGU General Assembly 2009, held 19-24 April, 2009 in Vienna, Austria http://meetings.copernicus.org/egu2009, p.1465"
Physics
Scientific paper
This work discusses two phenomena in Interplanetary Coronal Mass Ejection (ICME)(1)proton beam velocity distribution (2) cold high-density material. The plasma and magnetic-field instruments on the Helios 2 spacecraft detected three events of interplanetary coronal mass ejections, which occurred on 3 April 1979 at the location of 0.68 AU, on 9 May 1979 at 0.29 AU and on 30 March 1976 at 0.48 AU, named as case 1, case 2 and case 3, respectively. All three cases were revealed by the typical signature of magnetic field rotation, indicating a force-free magnetic flux tube. We present here, to our knowledge for the first time, the detailed proton velocity distributions measured within an ICME. In case 1, a beam velocity distribution was observed which lasted for almost an hour. These cold distributions were characterized by an isotropic core part with a low temperature, T ≤ 105 K, and by a broad and extended hot proton beam propagating along the local magnetic field direction with a speed of a sizable fraction of the local Alfv
Marsch Eckart
Tu Chia-Ying
Yao Shanshan
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