Search: onr:"swepub:oai:DiVA.org:uu-150853"
> Pulkkinen T. >
Multi-spacecraft ob...
Multi-spacecraft observation of plasma dipolarization/injection in the inner magnetosphere
-
Apatenkov, S. V. (author)
-
Sergeev, V. A. (author)
-
Kubyshkina, M. V. (author)
-
show more...
-
Nakamura, R. (author)
-
Baumjohann, W. (author)
-
Runov, A. (author)
-
Alexeev, I. (author)
-
Fazakerley, A. (author)
-
Frey, H. (author)
-
Muhlbachler, S. (author)
-
Daly, P. W. (author)
-
Sauvaud, J. -A (author)
-
Ganushkina, N. (author)
-
Pulkkinen, T. (author)
-
Reeves, G. D. (author)
-
- Khotyaintsev, Yuri (author)
- Uppsala universitet,Institutet för rymdfysik, Uppsalaavdelningen
-
show less...
-
(creator_code:org_t)
- 2007
- 2007
- English.
-
In: Annales Geophysicae. - 0992-7689 .- 1432-0576. ; 25:3, s. 801-814
- Related links:
-
https://urn.kb.se/re...
Abstract
Subject headings
Close
- Addressing the origin of the energetic particle injections into the inner magnetosphere, we investigate the 23 February 2004 substorm using a favorable constellation of four Cluster (near perigee), LANL and Geotail spacecraft. Both an energy-dispersed and a dispersionless injection were observed by Cluster crossing the plasma sheet horn, which mapped to 9-12 R-E in the equatorial plane close to the midnight meridian. Two associated narrow equatorward auroral tongues/streamers propagating from the oval poleward boundary could be discerned in the global images obtained by IMAGE/WIC. As compared to the energy-dispersed event, the dispersionless injection front has important distinctions consequently repeated at 4 spacecraft: a simultaneous increase in electron fluxes at energies similar to 1.300 keV, similar to 25 nT increase in B-Z and a local increase by a factor 1.5-1.7 in plasma pressure. The injected plasma was primarily of solar wind origin. We evaluated the change in the injected flux tube configuration during the dipolarization by fitting flux increases observed by the PEACE and RAPID instruments, assuming adiabatic heating and the Liouville theorem. Mapping the locations of the injection front detected by the four spacecraft to the equatorial plane, we estimated the injection front thickness to be similar to 1 R-E and the earthward propagation speed to be similar to 200-400km/s (at 9-12 RE). Based on observed injection properties, we suggest that it is the underpopulated flux tubes (bubbles with enhanced magnetic field and sharp inner front propagating earthward), which accelerate and transport particles into the strong-field dipolar region.
Subject headings
- NATURVETENSKAP -- Fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences (hsv//eng)
Keyword
- magnetospheric physics
- energetic particles
- trapped
- magnetotail
- plasma convection
- Physics
- Fysik
Publication and Content Type
- ref (subject category)
- art (subject category)
Find in a library
To the university's database
- By the author/editor
-
Apatenkov, S. V.
-
Sergeev, V. A.
-
Kubyshkina, M. V ...
-
Nakamura, R.
-
Baumjohann, W.
-
Runov, A.
-
show more...
-
Alexeev, I.
-
Fazakerley, A.
-
Frey, H.
-
Muhlbachler, S.
-
Daly, P. W.
-
Sauvaud, J. -A
-
Ganushkina, N.
-
Pulkkinen, T.
-
Reeves, G. D.
-
Khotyaintsev, Yu ...
-
show less...
- About the subject
-
- NATURAL SCIENCES
-
NATURAL SCIENCES
-
and Physical Science ...
- Articles in the publication
-
Annales Geophysi ...
- By the university
-
Uppsala University