Magnetospheric substorms are strongly modulated by interplanetary high-speed streams

EI Tanskanen*, JA Slavin, AJ Tanskanen, A Viljanen, TI Pulkkinen, HEJ Koskinen, A Pulkkinen, J Eastwood

*Tämän työn vastaava kirjoittaja

Tutkimustuotos: LehtiartikkeliArticleScientificvertaisarvioitu

Abstrakti

The occurrence of substorms was examined over a complete 11-year solar cycle, identifying over 5000 substorms. It was found that high-speed streams strongly modulate the substorm occurrence rate, peak amplitude and ionospheric dissipation in the form of Joule heating and auroral electron precipitation. Substorms occurring during the years of frequent interplanetary high-speed streams ( 1994 and 2003) are 32% more intense, on average, and transfer twice as much magnetic energy to the auroral ionosphere as the substorms occurring during the years of few or no high-speed streams ( 1993, 1995 - 2002). To characterize and to predict the substorm activity we form a new measure, the substorm activity parameter R-su, which we expect to become a powerful tool in analyzing the near-Earth space climate.

AlkuperäiskieliEnglanti
Artikkeli16104
Sivumäärä4
JulkaisuGeophysical Research Letters
Vuosikerta32
Numero16
DOI - pysyväislinkit
TilaJulkaistu - 26 elokuuta 2005
OKM-julkaisutyyppiA1 Julkaistu artikkeli, soviteltu

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