Near-Earth Substorm Onset - A Coordinated Study

MAL PERSSON*, HJ OPGENOORTH, T.I. Pulkkinen, AI ERIKSSON, PO DOVNER, GD REEVES, RD BELIAN, M ANDRE, LG BLOMBERG, RE ERLANDSON, MH BOEHM, AT AIKIO, I. Häggström

*Tämän työn vastaava kirjoittaja

Tutkimustuotos: LehtiartikkeliArticleScientificvertaisarvioitu

Abstrakti

We present simultaneous satellite and ground-based measurements of a substorm. Throughout the initial substorm expansion, southward drifting arcs are observed poleward of the expanding substorm aurora, indicating two independent systems of particle precipitation. Freja passes the brightening onset arc in the topside ionosphere near the moment of the substorm onset, observing an Alfven wave, field aligned current and oxygen ion outflow. The substorm onset occurs at low magnetospheric L-shells, near the poleward edge of the region of trapped particles. The location and time for the substorm injection are confirmed by geostationary spacecraft together with magnetometers, all-sky cameras and radar on the ground. We believe that the substorm onset may be triggered by modification of the oxygen content of the inner magnetosphere during the growth-phase caused by ionospheric ion outflow.

AlkuperäiskieliEnglanti
Sivut1875-1878
Sivumäärä4
JulkaisuGeophysical Research Letters
Vuosikerta21
Numero17
DOI - pysyväislinkit
TilaJulkaistu - 15 elokuuta 1994
OKM-julkaisutyyppiA1 Julkaistu artikkeli, soviteltu

Siteeraa tätä

PERSSON, MAL., OPGENOORTH, HJ., Pulkkinen, T. I., ERIKSSON, AI., DOVNER, PO., REEVES, GD., ... Häggström, I. (1994). Near-Earth Substorm Onset - A Coordinated Study. Geophysical Research Letters, 21(17), 1875-1878. https://doi.org/10.1029/94GL01426