ULF wave indices to characterize the solar wind-magnetosphere interaction and relativistic electron dynamics

Czasopismo : Acta Geophysica
Tytuł artykułu : ULF wave indices to characterize the solar wind-magnetosphere interaction and relativistic electron dynamics

Autorzy :
Lilensten, J.
Laboratoire de Planétologie de Grenoble, OSUG-CNRS, Grenoble, France, jean.lilensten@obs.ujf-grenoble.fr,
Zuccarello, F.
Dipartimento di Fisica e Astronomia, Universitá di Catania, Catania, Italy, fzu@oact.inaf.it,
Zuccarello, F.
Dipartimento di Fisica e Astronomia, Universitá di Catania, Catania, Italy, fzu@oact.inaf.it,
Lundstedt, H.
Swedish Institute of Space Physics, Lund, Sweden, henrik@lund.irf.se,
Kretzschmar, M.
LPCE/CNRS, Orléans, France, matthieu.kretzschmar@cnrs-orleans.fr,
Contarino, L.
INAF Osservatorio Astrofisico di Catania, Catania, Italy, lcont@oact.inaf.it,
Messerotti, M.
INAF-Trieste Astronomical Observatory, Trieste, Italy, messerotti@oats.inaf.it,
Desorgher, L.
Physikalisches Institut, University of Bern, Bern, Switzerland, desorgher@space.unibe.ch,
Usoskin, I. G.
Sodankylä Geophysical Observatory, University of Oulu, Oulu, Finland, Ilya.Usoskin@oulu.fi,
Dudok de Wit, T.
LPCE, CNRS and University of Orléans, Orléans, France, ddwit@cnrs-orleans.fr,
Valtonen, E.
Space Research Laboratory, Department of Physics, University of Turku, Turku, Finland, Eino.Valtonen@utu.fi,
Spurny, F.
Nuclear Physics Institute, Czech Academy of Sciences, Prague, Czech Republic, spurny@ujf.cas.cz,
Daglis, I.
National Observatory of Athens, Institute for Space Applications and Remote Sensing, Athens, Greece, daglis@space.noa.gr,
Romanova, N.
Institute of the Physics of the Earth, Moscow, Russia, runatka@mail.ru,
Abstrakty : To quantify the level of low-frequency wave activity of the magnetosphere and IMF, a set of the ULF wave power indices has been introduced. We demonstrate that the ULF activity global level can be very useful in space weather related problems. The application of the interplanetary index to an analysis of auroral activity driving has shown that a turbulent IMF drives auroral activity more strongly than the laminar solar wind does. The enhancements of relativistic electrons at the geosynchronous orbit are known not to be directly related to the intensity of magnetic storms. We found that the electron dynamics correlated well with long-lasting intervals of elevated ground ULF wave index. This fact confirms the importance of magnetospheric ULF turbulence in energizing electrons up to relativistic energies. The time-integrated ULF index demonstrates a significantly higher correlation with electron fluxes, which implies the occurrence of a cumulative effect in the electron energization.

Słowa kluczowe : solar wind, magnetosphere interaction, electron acceleration, MHD turbulence,
Wydawnictwo : Instytut Geofizyki PAN
Rocznik : 2009
Numer : Vol. 57, no. 1
Strony : 158 – 170
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DOI :
Cytuj : Lilensten, J. ,Zuccarello, F. ,Zuccarello, F. ,Lundstedt, H. ,Kretzschmar, M. ,Contarino, L. ,Messerotti, M. ,Desorgher, L. ,Usoskin, I. G. ,Dudok de Wit, T. ,Valtonen, E. ,Spurny, F. ,Daglis, I. ,Romanova, N. , ULF wave indices to characterize the solar wind-magnetosphere interaction and relativistic electron dynamics. Acta Geophysica Vol. 57, no. 1/2009
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