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Magnetosphere-ionosphere coupling of global Pi2 pulsations
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Keiling, A. (author)
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Marghitu, O. (author)
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Vogt, J. (author)
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Amm, O. (author)
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Bunescu, C. (author)
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Constantinescu, V. (author)
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Frey, H. (author)
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- Hamrin, Maria (author)
- Umeå universitet,Institutionen för fysik
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- Karlsson, Tomas (author)
- KTH,Rymd- och plasmafysik
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Nakamura, R. (author)
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Nilsson, H. (author)
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Semeter, J. (author)
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Sorbalo, E. (author)
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(creator_code:org_t)
- 2014
- 2014
- English.
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In: Journal of Geophysical Research A: Space Physics. - 2169-9380. ; 119:4, s. 2717-2739
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https://umu.diva-por... (primary) (Raw object)
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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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- Global Pi2 pulsations have mainly been associated with either low/middle latitudes or middle/high latitudes and, as a result, have been treated as two different types of Pi2 pulsations, either the plasmaspheric cavity resonance or the transient response of the substorm current wedge, respectively. However, in some reports, global Pi2 pulsations have a single period spanning low/middle/high latitudes. This super global type has not yet been satisfactorily explained. In particular, it has been a major challenge to identify the coupling between the source region and the ground. Here we report two consecutive super global Pi2 events which were observed over a wide latitudinal and longitudinal range. Using four spacecraft that were azimuthally spread out in the nightside and one spacecraft in the tail lobe, it was possible to follow the Pi2 signal along various paths with time delays from the magnetotail to the ground. Furthermore, it was found that the global pulsations were a combination of various modes including the transient Alfven and fast modes, field line resonance, and possibly a forced cavity-type resonance. As for the source of the Pi2 periodicity, oscillatory plasma flow inside the plasma sheet during flow braking (e.g., interchange oscillations) is a likely candidate. Such flow modulations, resembling the ground Pi2 pulsations, were recorded for both events.
Subject headings
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
- NATURVETENSKAP -- Fysik -- Fusion, plasma och rymdfysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Fusion, Plasma and Space Physics (hsv//eng)
Keyword
- Pi2
- M-I coupling
- magnetosphere
- ULF waves
Publication and Content Type
- ref (subject category)
- art (subject category)
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- By the author/editor
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Keiling, A.
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Marghitu, O.
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Vogt, J.
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Amm, O.
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Bunescu, C.
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Constantinescu, ...
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show more...
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Frey, H.
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Hamrin, Maria
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Karlsson, Tomas
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Nakamura, R.
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Nilsson, H.
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Semeter, J.
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Sorbalo, E.
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show less...
- 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 Astronomy Astrop ...
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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 ...
- Articles in the publication
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Journal of Geoph ...
- By the university
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Royal Institute of Technology
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Umeå University