What is happening near S q focus?

Oyama Koichiro, M. A. Abdu, A. Piel, H. Thiemann

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)


Rocket measurements of electron temperatures (T e ) in the E region over Kagoshima Space Center, Japan, carried out in a series of experiments conducted from 1970 to 1988 are analysed in this paper. All the 13 flights whose results are presented here took place around 11 AM, close to the S q current intensity maximum. Anomalously high electron temperatures associated with large increases of high energy tail electron population were observed whenever the estimated S q current vortex was very close to the launch site. Such anomalous temperatures were observed only in local winter months. A mechanism for the anomalous heating is proposed based on the solsticial asymmetry of the S q electric potentials and the resulting field-aligned current that could flow from winter to summer hemisphere.

Original languageEnglish
Pages (from-to)1263-1266
Number of pages4
JournalAdvances in Space Research
Issue number8
Publication statusPublished - 2000 Jan 1

All Science Journal Classification (ASJC) codes

  • Aerospace Engineering
  • Space and Planetary Science

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