Response of the equatorial and polar magnetosphere to the very tenuous solar wind on May 11, 1999

被引:24
作者
Farrugia, CJ [1 ]
Singer, HJ
Evans, D
Berdichevsky, D
Scudder, JD
Ogilvie, KW
Fitzenreiter, RJ
Russell, CT
机构
[1] Univ New Hampshire, Ctr Space Sci, Durham, NH 03824 USA
[2] NOAA, Space Environm Ctr, Boulder, CO USA
[3] NASA, Goddard Space Flight Ctr, Greenbelt, MD 20771 USA
[4] Raytheon ITSS, Lanham, MD USA
[5] Univ Iowa, Dept Phys & Astron, Iowa City, IA 52242 USA
[6] Univ Calif Los Angeles, Inst Geophys & Planetary Phys, Los Angeles, CA 90024 USA
关键词
D O I
10.1029/2000GL003800
中图分类号
P [天文学、地球科学];
学科分类号
07 ;
摘要
We examine effects in the equatorial and polar magnetosphere during 9-13 May, 1999. Earth's field at geostationary orbit became closely dipolar for similar to 16 hours when solar wind densities n(sw) were < 1 cm(-3) Electron precipitation in the northern polar cap intensified as n(sw) decreased, with significant fluxes up to similar to 15 keV energy on May 11. The simultaneous precipitation void in the southern polar cap implies a very pronounced north-south asymmetry, also reflected in the hemispherical power deposition. With an intense and collimated strahl, these observations support the ideas of Fairfield and Scudder [1985] on the preferential entry of the strahl into the northern hemisphere under the observed IMF away sector as a source of the north-south precipitation asymmetry. The polar rain north-south asymmetry argues against an ejecta source for the solar wind drop-out. The temporal profiles of solar wind parameters were very asymmetric with respect to the time of minimum n(sw), and strong compressions and substorm activity prevailed as n(sw) recovered.
引用
收藏
页码:3773 / 3776
页数:4
相关论文
共 8 条
[1]   POLAR RAIN - SOLAR CORONAL ELECTRONS IN THE EARTHS MAGNETOSPHERE [J].
FAIRFIELD, DH ;
SCUDDER, JD .
JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS, 1985, 90 (NA5) :4055-4068
[2]  
Fennell J. F., 1975, P INT C COSM RAYS 14, P1267
[3]   BIDIRECTIONAL SOLAR-WIND ELECTRON HEAT-FLUX AND HEMISPHERICALLY SYMMETRICAL POLAR RAIN [J].
GOSLING, JT ;
BAKER, DN ;
BAME, SJ ;
ZWICKL, RD .
JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS, 1986, 91 (A10) :1352-1358
[4]   The magnetosphere on May 11, 1999, the day the solar wind almost disappeared: I. Current systems [J].
Le, G ;
Russell, CT ;
Petrinec, SM .
GEOPHYSICAL RESEARCH LETTERS, 2000, 27 (13) :1827-1830
[5]   Magnetosphere on May 11, 1999, the day the solar wind almost disappeared: II. Magnetic pulsations in space and on the ground [J].
Le, G ;
Chi, PJ ;
Goedecke, W ;
Russell, CT ;
Szabo, A ;
Petrinec, SM ;
Angelopoulos, V ;
Reeves, GD ;
Chun, FK .
GEOPHYSICAL RESEARCH LETTERS, 2000, 27 (14) :2165-2168
[6]   THE VARIATION OF RECONNECTION RATE AT THE DAYSIDE MAGNETOPAUSE AND CUSP ION PRECIPITATION [J].
LOCKWOOD, M ;
SMITH, MF .
JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS, 1992, 97 (A10) :14841-14847
[7]   LONG-PERIOD POLAR RAIN VARIATIONS, SOLAR-WIND AND HEMISPHERICALLY SYMMETRICAL POLAR RAIN [J].
MAKITA, K ;
MENG, CI .
JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS, 1987, 92 (A7) :7381-7393
[8]   Statistical properties of particle precipitation in the polar cap during intervals of northward interplanetary magnetic field [J].
Shinohara, I ;
Kokubun, S .
JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS, 1996, 101 (A1) :69-82