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JOURNAL OF GEOPHYSICAL RESEARCH,
VOL. 112,
A03301,
doi:10.1029/2006JA011757,
2007
Pulsating dayside aurora in relation to ion upflow events during a northward interplanetary magnetic field (IMF) dominated
by a strongly negative IMF BY
D. A. Lorentzen
Geophysics Department, University Centre in Svalbard, Longyearbyen, Norway
P. M. Kintner
School of Electrical and Computer Engineering, Cornell University, Ithaca, New York, USA
J. Moen
Department of Physics, University of Oslo, Oslo, Norway
F. Sigernes
Geophysics Department, University Centre in Svalbard, Longyearbyen, Norway
K. Oksavik
Johns Hopkins University Applied Physics Laboratory, Laurel, Maryland, USA
Y. Ogawa
Solar-Terrestrial Environment Laboratory, Nagoya University, Nagoya, Japan
J. Holmes
Geophysics Department, University Centre in Svalbard, Longyearbyen, Norway
Abstract
We report a study of ion upflow as seen by the European Incoherent Scatter (EISCAT) Svalbard Radar (ESR), initiated by a rotation
from interplanetary magnetic field (IMF) BZ negative to IMF BZ positive, under the influence of a strongly negative IMF BY. We combine ground-based instruments, such as meridian scanning photometers (MSP), all-sky imager (ASI) data, and radars,
with solar wind data from the Advanced Composition Explorer (ACE) spacecraft and low-altitude particle precipitation data
from the Defense Meteorological Satellite Program (DMSP) F-13 spacecraft as well as wave data from the Svalbard EISCAT Rocket
Study of Ion Outflows (SERSIO) sounding rocket flight. Following a coronal mass ejection, the solar wind data showed high
dynamic pressures (up to 20 n Pa) and a strongly varying IMF. The observed ion upflow was seen to be of a pulsed nature and
sustained by pulsed soft electron precipitation. The data findings indicated pulsed lobe reconnection as the mechanism funneling
energy and momentum down to the northern polar hemisphere.
Received 30
March
2006;
accepted 16
November
2006;
published 9
March
2007.
Keywords: dayside aurora;
ion upflow.
Index Terms: 2706 Magnetospheric Physics: Cusp; 2704 Magnetospheric Physics: Auroral phenomena (2407); 2736 Magnetospheric Physics: Magnetosphere/ionosphere interactions (2431); 2784 Magnetospheric Physics: Solar wind/magnetosphere interactions; 2411 Ionosphere: Electric fields (2712).
Read Full Article (file size: 1660913 bytes) Cited by
Citation: Lorentzen, D. A., P. M. Kintner, J. Moen, F. Sigernes, K. Oksavik, Y. Ogawa, and J. Holmes
(2007),
Pulsating dayside aurora in relation to ion upflow events during a northward interplanetary magnetic field (IMF) dominated
by a strongly negative IMF BY,
J. Geophys. Res.,
112,
A03301,
doi:10.1029/2006JA011757.
Copyright 2007 by the American Geophysical Union.
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