MAGNETIC HOLES IN THE SOLAR-WIND AND THEIR RELATION TO MIRROR-MODE STRUCTURES

被引:54
作者
WINTERHALTER, D
NEUGEBAUER, M
GOLDSTEIN, BE
SMITH, EJ
TSURUTANI, BT
BAME, SJ
BALOGH, A
机构
[1] LOS ALAMOS NATL LAB, LOS ALAMOS, NM 87545 USA
[2] UNIV LONDON IMPERIAL COLL SCI TECHNOL & MED, BLACKETT LAB, LONDON SW7 2BZ, ENGLAND
关键词
D O I
10.1007/BF00768780
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
Data obtained by the Ulysses magnetometer and solar wind analyzer have been combined to study the properties of magnetic holes in the solar wind between 1 and 5.4 AU and to 23 degrees south latitude. Although the plasma surrounding the holes was generally stable against the mirror instability, there are indications that the holes may have been remnants of mirror mode structures created upstream of the points of observation. Those indications include: (1) For the few holes for which proton or alpha-particle pressure could be measured inside the hole, the ion thermal pressure was always greater than in the plasma adjacent to the holes. (2) The plasma surrounding many of the holes was marginally stable for the mirror mode, while the plasma environment of all the holes was significantly closer to mirror instability than was the average solar wind. (3) The plasma containing trains of closely spaced holes was closer to mirror instability than was the plasma containing isolated holes. (4) The near-hole plasma had much higher ion beta (ratio of thermal to magnetic pressure) than did the average solar wind.
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页码:201 / 204
页数:4
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