Magnetic Hole observations in the near earth space

Details Magnetic Hole observations in the near earth space Magnetic Hole observations in the near earth space

Dec 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsh13b1528x&link_type=abstract

American Geophysical Union, Fall Meeting 2009, abstract #SH13B-1528

Physics

[2164] Interplanetary Physics / Solar Wind Plasma

Scientific paper

Using Cluster magnetic field and plasma data, we study the magnetic holes in the solar wind at 1 AU. From statistical research, we find that the geometrical shape and the occurrence rate of magnetic holes in the solar wind do not show significant change from 0.72AU to 1AU in comparison with previous studies, which is therefore inferred that most of magnetic holes are formed and fully developed before 0.72 AU. We have also surveyed the relationship between the occurrence rate of the solar wind magnetic holes and the solar wind plasma parameters. It is found that the results are quite different between two types of holes, inferring that they are from different sources. All of these results helped us to discuss the formation mechanism of the magnetic holes in the solar wind. Magnetic depression structures (magnetic holes) of short time durations from seconds to minutes have also been studied using Cluster data in the high latitude cusp (which can be partially seen in Shi et al., JGR, in press, 2009JA014283.). Based on multi-spacecraft measurements, we found that they are spatial structures traveling across the spacecraft. These spatial features are confirmed by the calculation of the boundary normal directions and velocities using various methods. We discuss the possible formation mechanism of this type of small structures and propose that the existence of these magnetic holes in the cusp region might indicate that the mirror structures formed in the sheath could enter the cusp and survive, attributed to the open geometry of the cusp magnetic field, although the possibility of local generation of these structures can not be totally ruled out. Finally we compared the magnetic holes in the different regions of the near earth space.

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