Physics
Scientific paper
May 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993soph..145..189b&link_type=abstract
Solar Physics (ISSN 0038-0938), vol. 145, no. 1, p. 189-196.
Physics
1
Current Sheets, Heliosphere, Radiant Flux Density, Solar Corona, Solar Wind Velocity, Interplanetary Magnetic Fields, Solar Cycles, Solar Longitude, Solar Rotation
Scientific paper
Solar wind velocity measurements at IMF sector boundary crossings at 1 AU during 1972-1977 are used to infer the azimuthal structure of the solar wind velocity in the heliospheric current sheet (HCS). The solar wind velocity in the in-ecliptic portion of the current sheet is found to vary from longitude to longitude, where it originates from the corona. The yearly average value of solar wind velocity in the HCS is found to vary with the phase of the solar cycle, with a maximum value around 1974. The K-corona brightness on the source surface corresponding to the IMF sector boundary crossings during the period under consideration also exhibits a similar but opposite pattern of variation when the data are averaged over a long period. It is concluded that there exists a longitudinal variation of solar wind velocity in the HCS.
Bala B.
Prabhakaran Nayar S. R.
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