A Comprehensive Study of Relationship Between Subsolar Standoff Distance of the Magnetopause and Cone Angle of Interplanetary Magnetic Field

Details A Comprehensive Study of Relationship Between Subsolar Standoff Distance of the Magnetopause and Cone Angle of Interplanetary Magnetic Field A Comprehensive Study of Relationship Between Subsolar Standoff Distance of the Magnetopause and Cone Angle of Interplanetary Magnetic Field

Dec 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsm51b1780h&link_type=abstract

American Geophysical Union, Fall Meeting 2010, abstract #SM51B-1780

Physics

[2724] Magnetospheric Physics / Magnetopause And Boundary Layers

Scientific paper

The subsolar standoff distance of the Earth’s magnetopause is an important parameter in studying interactions between the solar wind and the magnetosphere. Its value is mainly controlled by the north-south component (Bz) of the interplanetary magnetic field (IMF) and solar wind dynamic pressure (Dp). Recent studies have found that the subsolar standoff distance is large for small cone angle of the IMF, that is, the orientation of the IMF is almost parallel to the Sun-Earth line. However, relationship between the subsolar standoff distance and cone angle under different IMF Bz and Dp conditions have not been comprehensively studied. With a large set of subsolar magnetopause crossings identified from the THEMIS data and their corresponding solar wind conditions obtained from the OMNI data, we are able to bin the magnetopause crossings in four categories by the southward and northward polarities of the IMF, and large and small Dp. Here we find that the relationship between the subsolar standoff distance and cone angle changes with IMF Bz and Dp. The smallest subsolar standoff distance occurs when the cone angle is near 90 degrees in the category of southward IMF and high Dp.

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