Physics
Scientific paper
May 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agusmsh32a..02l&link_type=abstract
American Geophysical Union, Spring Meeting 2002, abstract #SH32A-02
Physics
7522 Helioseismology, 7524 Magnetic Fields, 2109 Discontinuities, 2162 Solar Cycle Variations (7536), 2169 Sources Of The Solar Wind
Scientific paper
Based on a simple force balance analysis, we propose presence of polarward temperature gradient at the bottom of solar convenction zone due to additional inward magnetic force acting on the lower latitude boundary of convection zone and radiative zone (i.e., the upper part of tachocline). The polarward temperature gradient in a rotational star can trigger (1) an easterly wind to cause latitudinal differential rotation and (2) Rossby waves as well as horizontal circulations on two sides of the Rossby wave. We found that many observed structures and characteristics of prominences, magnetic clouds, Alfven waves, rotational discontinuities, and acceleration of solar wind in the polar coronal hole can be explained based on the presence of these circulations and Rossby waves. Our analysis also indicates an equatorward temperature gradient in the lower part of tachocline, which can result in a westerly wind in the middle latitude of this region. This result is consistent with observed differential rotation profile in the tachocline region. Variations of differential rotation and solar cycle will also be discussed.
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