Global imaging of O+ from IMAGE/HENA

被引：117

作者：

Mitchell, DG ^{[1
]}

Brandt, PC

Roelof, EC

Hamilton, DC

Retterer, KC

Mende, S

机构：

[1] Johns Hopkins Univ, Appl Phys Lab, Laurel, MD 20707 USA

[2] Univ Maryland, College Pk, MD 20742 USA

[3] Univ Calif Berkeley, Space Sci Lab, Berkeley, CA 94720 USA

来源：

SPACE SCIENCE REVIEWS | 2003年 / 109卷 / 1-4期

关键词：

ENA imaging; substorm; oxygen; dipolarization; precipitation;

D O I：

10.1023/B:SPAC.0000007513.55076.00

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The magnetospheric O+ population in the 52-180 keV range during storms is investigated through the analysis of energetic neutral atom (ENA) images. The images are obtained from the high energy neutral atom (HENA) imager onboard the IMAGE satellite. At each substorm onset following the commencement of a geomagnetic storm the oxygen ENA display similar to30 min intense bursts. Only very weak corresponding features in the 60-119 keV hydrogen ENA can be occasionally seen. The dominating fraction of the oxygen ENA emissions are produced when O+ ions mirror/precipitate at low altitudes, where the number density of the neutral atmosphere is high. During the storm we observed several bursts of oxygen ENA, but it is still not clear how much the O+ content of the ring current increases during the storm main phase. Our observations suggest that the responsible injection mechanism is mass-dependent and scatters the pitch angles. This leads us to favor a non-adiabatic mechanism proposed by (Delcourt, 2002).

引用

页码：63 / 75

页数：13

共 14 条

[1] Ion energization mechanisms at 1700 km in the auroral region [J].

Andre, M ;

Norqvist, P ;

Andersson, L ;

Eliasson, L ;

Eriksson, AI ;

Blomberg, L ;

Erlandson, RE ;

Waldemark, J .

JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS, 1998, 103 (A3) :4199-4222

[2]

[Anonymous], 2000, SPACE SCI REV

[3] PARALLEL ACCELERATION AND TRANSPORT OF IONS FROM POLAR IONOSPHERE TO PLASMA SHEET [J].

CLADIS, JB .

GEOPHYSICAL RESEARCH LETTERS, 1986, 13 (09) :893-896

[4] DISTRIBUTION IN MAGNETOTAIL OF O+ IONS FROM CUSP CLEFT IONOSPHERE - A POSSIBLE SUBSTORM TRIGGER [J].

CLADIS, JB ;

FRANCIS, WE .

JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS, 1992, 97 (A1) :123-130

[5] CLEFT CONTRIBUTION TO RING CURRENT FORMATION [J].

DELCOURT, DC ;

SAUVAUD, JA ;

MOORE, TE .

JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS, 1990, 95 (A12) :20937-20943

[6] PRECIPITATION OF IONS INDUCED BY MAGNETOTAIL COLLAPSE [J].

DELCOURT, DC ;

MOORE, TE .

JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS, 1992, 97 (A5) :6405-6415

[7] GYRO-PHASE EFFECTS NEAR THE STORM-TIME BOUNDARY OF ENERGETIC PLASMA [J].

DELCOURT, DC ;

MOORE, TE ;

SAUVAUD, JA .

GEOPHYSICAL RESEARCH LETTERS, 1991, 18 (08) :1485-1488

[8] Particle acceleration by inductive electric fields in the inner magnetosphere [J].

Delcourt, DC .

JOURNAL OF ATMOSPHERIC AND SOLAR-TERRESTRIAL PHYSICS, 2002, 64 (5-6) :551-559

[9] RING CURRENT DEVELOPMENT DURING THE GREAT GEOMAGNETIC STORM OF FEBRUARY 1986 [J].

HAMILTON, DC ;

GLOECKLER, G ;

IPAVICH, FM ;

STUDEMANN, W ;

WILKEN, B ;

KREMSER, G .

JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS, 1988, 93 (A12) :14343-14355

[10] High energy neutral atom (HENA) imager for the IMAGE mission [J].

Mitchell, DG ;

Jaskulek, SE ;

Schlemm, CE ;

Keath, EP ;

Thompson, RE ;

Tossman, BE ;

Boldt, JD ;

Hayes, JR ;

Andrews, GB ;

Paschalidis, N ;

Hamilton, DC ;

Lundgren, RA ;

Tums, EO ;

Wilson, P ;

Voss, HD ;

Prentice, D ;

Hsieh, KC ;

Curtis, CC ;

Powell, FR .

SPACE SCIENCE REVIEWS, 2000, 91 (1-2) :67-112

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