Physics – Space Physics
Scientific paper
Dec 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agufmsh61a0429t&link_type=abstract
American Geophysical Union, Fall Meeting 2002, abstract #SH61A-0429
Physics
Space Physics
2102 Corotating Streams, 2109 Discontinuities, 2111 Ejecta, Driver Gases, And Magnetic Clouds
Scientific paper
In a statistical study of 28 geomagnetic negative sudden impulses (SI-s), Takeuchi et al. [2002] showed that interplanetary causes of SI-s can be classified into 4 types. Almost all the SI-s were caused by tangential discontinuities at (1) high-low speed stream interfaces within corotating interaction region (CIR), (2) front boundaries of magnetic clouds, and (3) rear boundaries of non-compressive density enhancement (NCDE). However, only one SI- occurred on February 11, 1999 was caused by an unusual structure in the solar wind. It was observed by ACE (X:243, Y:9 Re), IMP 8 (X:16, Y:28 Re), and WIND (X:-30, Y:-72 Re). The structure had low proton density and temperature and high magnetic field strength, and was embedded in a CIR. The duration was about 100 minutes. That's why I call it ``small-scale plasma hole''. A geomagnetic negative-positive sudden impulse (SI-/SI+) pair was observed at low-latitudes. The structure was close to a heliospheric current sheet. By examining the time-lag of the convection from ACE to IMP8, the Earth, and WIND, we found the plasma hole aligned with the CIR. This has to be some transient structure because similar structures could not be found within the CIR one solar rotation before or after. Although it had some properties similar to magnetic clouds or small-scale flux ropes [Moldwin et al., 2000], the field direction inside it was almost constant with no rotation. Small-scale structures in the solar wind have come to attract the interest of scientists in both space physics and astrophysics in recent times [e.g., Wang et al., 1998]. Not only large structures such as magnetic clouds or coronal mass ejections (CMEs) but also small-scale structures should be investigated in detail by making good use of recent multi-satellite solar wind observations. In the paper, we show the characteristics of the plasma hole and discuss its probable source.
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