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Dipolarization in the inner magnetosphere during a geomagnetic storm on 7 October 2015
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- Matsui, H. (author)
- Univ New Hampshire, Ctr Space Sci, Durham, NH 03824 USA.
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- Erickson, P. J. (author)
- MIT, Haystack Observ, Westford, MA 01886 USA.
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- Foster, J. C. (author)
- MIT, Haystack Observ, Westford, MA 01886 USA.
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- Khotyaintsev, Yu. V. (author)
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- Univ New Hampshire, Ctr Space Sci, Durham, NH 03824 USA MIT, Haystack Observ, Westford, MA 01886 USA. (creator_code:org_t)
- American Geophysical Union (AGU), 2016
- 2016
- English.
- In: Geophysical Research Letters. - : American Geophysical Union (AGU). - 0094-8276 .- 1944-8007. ; 43:18, s. 9397-9405
- Journal article (peer-reviewed)
Abstract
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- A dipolarization event was observed by the Magnetospheric Multiscale (MMS) spacecraft at L = 3.8 and 19.8 magnetic local time starting at similar to 23:42:36 UT on 7 October 2015. The magnetic and electric fields showed initially coherent variations between the spacecraft. The sunward convection turned tailward after the dipolarization. The observation is interpreted in terms of the pressure balance or the momentum equation. This was followed by a region traversed where the fields were irregular. The scale length was of the order of the ion gyroradius, suggesting the kinetic nature of the fluctuations. Combination of the multi-instrument, multispacecraft data reveals a more detailed picture of the dipolarization event in the inner magnetosphere. Conjunction ionosphere-plasmasphere observations from DMSP, two-dimensional GPS total electron content, the Millstone Hill midlatitude incoherent scatter radar, and AMPERE measurements imply that MMS observations are located on the poleward edge of the ionospheric trough where Region 2 field-aligned currents flow.
Subject headings
- NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Annan geovetenskap och miljövetenskap (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Other Earth and Related Environmental Sciences (hsv//eng)
- NATURVETENSKAP -- Fysik -- Fusion, plasma och rymdfysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Fusion, Plasma and Space Physics (hsv//eng)
- NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Multidisciplinär geovetenskap (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Geosciences, Multidisciplinary (hsv//eng)
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- Blake, J. B.
- Cohen, I. J.
- Ergun, R. E.
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