Comparisons of ground-based and polar UVI observations - Auroral streamers versus substorm activity

K Kauristie*, VA Sergeev, TI Pulkkinen, P Eglitis, HJ Opgenoorth, O Amm, J. R. T. Jussila, K Liou

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

Abstract

We analyse an auroral streamer observed in the Scandinavian sector by a multitude of different instruments (MIRACLE all-sky cameras, IMAGE magnetometers and EISCAT radar). Local observations of streamers resemble substorm activity: After intrusion to the MIRACLE field-of-view the streamer drifted southwestward (average speed similar to0.9 km/s) resembling a growth phase are. The streamer was related with distinct temporal ground magnetic field variations which were superposed on more prolonged activity resembling a substorm (DeltaX similar to 400 nT, duration,2 hrs). A more detailed analysis reveals, however, that streamers and substorms can clearly be distinguished: The strongest ionospheric currents how parallel to the streamer (e.g. in our case in the NW direction), and the ionospheric electric field is enhanced near the streamer, but not directed towards the structure, like typically near arcs, but parallel to it.

Original languageEnglish
Title of host publicationPROCEEDINGS OF THE FIFTH INTERNATIONAL CONFERENCE ON SUBSTORMS
EditorsA Wilson
Pages299-302
Number of pages4
Publication statusPublished - 2000
MoE publication typeA4 Article in a conference publication
EventInternational Conference on Substorms - St. Petersburg, Russian Federation
Duration: 16 May 200020 May 2000
Conference number: 5

Publication series

NameESA SPECIAL PUBLICATIONS
PublisherESA PUBLICATIONS DIVISION C/O ESTEC
Volume443
ISSN (Print)0379-6566

Conference

ConferenceInternational Conference on Substorms
Abbreviated titleICS
Country/TerritoryRussian Federation
CitySt. Petersburg
Period16/05/200020/05/2000

Keywords

  • Auroral streamers
  • plasma sheet flows
  • ASSOCIATION
  • MAGNETOTAIL
  • FLOWS

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