Physics
Scientific paper
Jan 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998jgr...103..277b&link_type=abstract
Journal of Geophysical Research, vol. 10, p. 277
Physics
143
Solar Prominences, Magnetic Clouds, Interplanetary Magnetic Fields, Plasma Composition, Force-Free Magnetic Fields, Solar Wind, Coronal Mass Ejection, Magnetic Field Configurations, Helium Ions, Hydrogen Ions, Soho Mission, Solar Instruments
Scientific paper
This work discusses the relations among (1) an interplanetary force-free magnetic cloud containing a plug of cold high-density material with unusual composition, (2) a coronal mass ejection (CME), (3) an eruptive prominence, and (4) a model of prominence material supported by a force-free magnetic flux rope in a coronal streamer. The magnetic cloud moved past the Wind spacecraft located in the solar wind upstream of Earth on January 10 and 11, 1997. The magnetic field configuration in the magnetic cloud was approximately a constant-alpha, force-free flux rope. The He-4(2+)/H(+) abundance in the most of the magnetic cloud was similar to that of the streamer belt material, suggesting an association between the magnetic cloud and a helmet streamer. A very cold region of exceptionally high density was detected at the rear of the magnetic cloud. This dense region had an unusual composition, including (1) a relatively high (10 percent) He-4(2+)/He(+) abundance and (2) He-4(+), with an abundance relative to He-4(2+) of about 1 percent, and the unusual charge states of O(5+) and Fe(5+). Thus we suggest that the high-density region might be prominence material. The CME was seen in the solar corona on January 6, 1997, by the large angle and spectrometric coronagraph (LASCO) instrument on SOHO shortly after an eruptive prominence. A helmet streamer was observed near the latitude of the eruptive prominence a quarter of a solar rotation before and after the eruptive prominence.
Burlaga Len
Farrugia Charles
Fitzenreiter Richard
Gloeckler George
Howard Ralph
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