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Oxygen Ion Flow Rev...
Oxygen Ion Flow Reversals in Earth's Magnetotail : A Cluster Statistical Study
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- De Spiegeleer, Alexandre (author)
- Umeå universitet,Institutionen för fysik
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- Hamrin, Maria, 1972- (author)
- Umeå universitet,Institutionen för fysik,Umeå university
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- Volwerk, M. (author)
- Austrian Academy of Sciences
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- Karlsson, Tomas, 1964- (author)
- KTH,Rymd- och plasmafysik
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- Gunell, Herbert (author)
- Umeå universitet,Institutionen för fysik,Belgian Institute for Space Aeronomy, Brussels, Belgium,Umeå University
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- Chong, Ghai Siung (author)
- Umeå universitet,Institutionen för fysik
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- Pitkänen, Timo, 1979- (author)
- Umeå universitet,Institutionen för fysik,Shandong Provincial Key Laboratory of Optical Astronomy and Solar-Terrestrial Environment, Institute of Space Sciences, Shandong University, Weihai, China,Umeå University
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- Nilsson, H. (author)
- Swedish Institute of Space Physics View profile
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(creator_code:org_t)
- Wiley-Blackwell, 2019
- 2019
- English.
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In: Journal of Geophysical Research - Space Physics. - : Wiley-Blackwell. - 2169-9380 .- 2169-9402. ; 124:11, s. 8928-8942
- Related links:
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https://agupubs.onli...
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https://urn.kb.se/re...
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https://doi.org/10.1...
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https://urn.kb.se/re...
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Abstract
Subject headings
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- We present a statistical study of magnetotail flows that change direction from earthward to tailward using Cluster spacecraft. More precisely, we study 318 events of particle flux enhancements in the O+ data for which the pitch angle continuously changes with time, either from 0 degrees to 180 degrees or from 180 degrees to 0 degrees. These structures are called "Pitch Angle Slope Structures" (PASSes). PASSes for which the pitch angle changes from 0 degrees to 180 degrees are observed in the Northern Hemisphere while those for which the pitch angle changes from 180 degrees to 0 degrees are observed in the Southern Hemisphere. These flux enhancements result in a reversal of the flow direction from earthward to tailward regardless of the hemisphere where they are observed. Sometimes, several PASSes can be observed consecutively which can therefore result in oscillatory velocity signatures in the earth-tail direction. The PASS occurrence rate increases from 1.8% to 3.7% as the AE index increases from similar to 0 to similar to 600 nT. Also, simultaneously to PASSes, there is typically a decrease in the magnetic field magnitude due to a decrease (increase) of the sunward component of the magnetic field in the Northern (Southern) Hemisphere. Finally, based on the 115 (out of 318) PASSes that show energy-dispersed structures, the distance to the source from the spacecraft is estimated to be typically R-E along the magnetic field line. This study is important as it sheds light on one of the causes of tailward velocities in Earth's magnetotail.
Subject headings
- NATURVETENSKAP -- Fysik -- Fusion, plasma och rymdfysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Fusion, Plasma and Space Physics (hsv//eng)
- NATURVETENSKAP -- Geovetenskap och miljövetenskap (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences (hsv//eng)
Keyword
- Earth's magnetotail
- oxygen ions
- velocity reversal
- pitch angle distribution
- Cluster
- field aligned
Publication and Content Type
- ref (subject category)
- art (subject category)
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De Spiegeleer, A ...
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Hamrin, Maria, 1 ...
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Volwerk, M.
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Karlsson, Tomas, ...
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Gunell, Herbert
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Chong, Ghai Siun ...
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Pitkänen, Timo, ...
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Nilsson, H.
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- About the subject
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Physical Science ...
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and Fusion Plasma an ...
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Earth and Relate ...
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Journal of Geoph ...
- By the university
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Umeå University
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Royal Institute of Technology