A comparison of quasi-periodicity in the ion flux enhancements recorded in-bound and out-bound at Halley's Comet by the EPONA instrument aboard Giotto and by the TUNDE-M instrument aboard Vega-1

S. McKenna-Lawlor, E. Kirsch, P. Daly, D. O'Sullivan, A. Thompson, A. Somogyi, K. Kecskemety

Research output: Contribution to journalArticle

Abstract

Energetic particle data recorded in-situ at Halley's Comet during its 1986 apparition by instrumentation aboard Giotto (EPONA) and aboard Vega-1 (TUNDE-M) are presented, with particular reference to the identification on the in-bound and outbound records obtained in each case of quasi-periodic variations detected in the ion fluxes. The variations detected by both instruments, at intervals of more than one week apart, were complementary and had a periodicity of approximately T = 4.5 hours (inbound) and T = 5.4 hours (outbound). It is suggested that this phenomenon may have been related to a spin-modulation of the outgassing rate of the nucleus (assumed rotation rate 54 hours).

Original languageEnglish
Pages (from-to)325-330
Number of pages6
JournalAdvances in Space Research
Volume9
Issue number3
DOIs
Publication statusPublished - 1989

ASJC Scopus subject areas

  • Aerospace Engineering
  • Astronomy and Astrophysics
  • Geophysics
  • Atmospheric Science
  • Space and Planetary Science
  • Earth and Planetary Sciences(all)

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