Near-Earth Substorm Onset - A Coordinated Study

Tutkimustuotos: Lehtiartikkelivertaisarvioitu

Tutkijat

  • 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

Organisaatiot

  • Finnish Meteorological Institute
  • Swedish Institute of Space Physics
  • Los Alamos National Laboratory
  • Johns Hopkins University
  • KTH Royal Institute of Technology
  • University of Oulu
  • Max Planck Institute for Extraterrestrial Physics

Kuvaus

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.

Yksityiskohdat

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

ID: 3009604