Does the polar cap disappear under an extended strong northward IMF?

被引：16

作者：

Zhang, Yongliang ^{[1
]}

Paxton, Larry J. ^{[1
]}

Newell, Patrick T. ^{[1
]}

Meng, Ching-I ^{[1
]}

机构：

[1] Johns Hopkins Univ, Appl Phys Lab, Laurel, MD 20723 USA

来源：

JOURNAL OF ATMOSPHERIC AND SOLAR-TERRESTRIAL PHYSICS | 2009年 / 71卷 / 17-18期

关键词：

Aurora; Double reconnection; Interplanetary magnetic field; Closed field fine; INTERPLANETARY MAGNETIC-FIELD; ULTRAVIOLET IMAGER GUVI; ELECTRON-PRECIPITATION; MAGNETOSPHERE; LONG; MAGNETOTAIL; SIMULATION; MISSION; MODEL; TAIL;

D O I：

10.1016/j.jastp.2009.09.005

中图分类号：

P3 [地球物理学]; P59 [地球化学];

学科分类号：

0708 ; 070902 ;

摘要：

The suggestion that the polar cap can completely disappear under certain northward IMF conditions is still controversial. We know that the size of the polar cap is strongly controlled by the interplanetary magnetic field (IMF). Under a southward IMF, the polar cap is usually large and filled with weak diffuse polar rain electrons. The polar cap shrinks under a northward IMF. Here we use the global aurora[ images and coincident particle measurements on May 15, 2005 to show that the discrete arcs (due to precipitation of both electrons and ions) expanded from the dayside oval to the nightside oval and filled the whole polar ionosphere after a long (8 h) and strong (similar to 5-30 nT) northward IMF B,, The observations suggested that the polar cap disappeared under a closed magnetosphere. (C) 2009 Elsevier Ltd. All rights reserved.

引用

页码：2006 / 2012

页数：7

共 50 条

[1] OBSERVATIONS OF NEUTRAL WINDS IN THE POLAR-CAP DURING NORTHWARD IMF
NICIEJEWSKI, RJ
KILLEEN, TL
WON, Y
JOURNAL OF ATMOSPHERIC AND TERRESTRIAL PHYSICS, 1994, 56 (02): : 285 - 295
[2] Entry of the POLAR spacecraft into the polar cusp under northward IMF conditions
Russell, CT
Fedder, JA
Slinker, SP
Zhou, XW
Le, G
Luhmann, JG
Fenrich, FR
Chandler, MO
Moore, TE
Fuselier, SA
GEOPHYSICAL RESEARCH LETTERS, 1998, 25 (15) : 3015 - 3018
[3] Entry of the POLAR spacecraft into the polar cusp under northward IMF conditions
Univ of California, Los Angeles, United States
Geophys Res Lett, 15 (3015-3018):
[4] Entry of the POLAR spacecraft into the polar cusp under northward IMF conditions
Russell, C.T.
Fedder, J.A.
Slinker, S.P.
Zhou, X.-W.
Le, G.
Luhmann, J.G.
Fenrich, F.R.
Chandler, M.O.
Moore, T.E.
Fuselier, S.A.
Geophysical Research Letters, 1998, 25 (15): : 3015 - 3018
[5] Statistical study of the effect of ULF fluctuations in the IMF on the cross polar cap potential drop for northward IMF
Kim, H. -J.
Lyons, L.
Boudouridis, A.
Pilipenko, V.
Ridley, A. J.
Weygand, J. M.
JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS, 2011, 116
[6] Polar cap ion beams during periods of northward IMF: Cluster statistical results
Maggiolo, R.
Echim, M.
De Keyser, J.
Fontaine, D.
Jacquey, C.
Dandouras, I.
ANNALES GEOPHYSICAE, 2011, 29 (05) : 771 - 787
[7] Seasonal effect for polar cap sunward plasma flows at strongly northward IMF Bz
Koustov, A. V.
Yakymenko, K. N.
Ponomarenko, P. V.
JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS, 2017, 122 (02) : 2530 - 2541
[8] Field-aligned currents in the dayside cusp and polar cap region during northward IMF
Vennerstrom, S
Moretto, T
Olsen, N
Friis-Christensen, E
Stampe, AM
Watermann, JF
JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS, 2002, 107 (A8)
[9] IMF BX AND BY DEPENDENCIES OF THE POLAR-CAP AURORAL DISTRIBUTION FOR NORTHWARD IMF ORIENTATION INFERRED FROM OBSERVATIONS AT VOSTOK STATION
TROSHICHEV, OA
GUSEV, MG
JOURNAL OF ATMOSPHERIC AND TERRESTRIAL PHYSICS, 1994, 56 (02): : 237 - 244
[10] Ion Heating in the Polar Cap Under Northwards IMF Bz
Lamarche, Leslie J.
Varney, Roger H.
Reimer, Ashton S.
JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS, 2021, 126 (11)

← 1 2 3 4 5 →