Acta Geodaetica et Geophysica Hungarica

, Volume 42, Issue 1, pp 23–58 | Cite as

Effect of the August 11, 1999 total solar eclipse on geomagnetic pulsations

  • P. Bencze
  • B. Heilig
  • B. Zieger
  • J. Szendrői
  • J. Verő
  • H. Lühr
  • K. Yumoto
  • Y. Tanaka
  • J. Střeštík
Article
  • 31 Downloads

Abstract

The total solar eclipse of August 11, 1999 offered a unique opportunity for the study of its geomagnetic effect — more specifically, of its effect on geomagnetic (Pc3) pulsations, as it swept through Europes many observatories, and additional temporary stations have also been established by Japanese, German and Hungarian groups. The present paper starts with an analysis of the ionospheric-interplanetary background. In the interplanetary medium, no indication was found which could result in any extraordinary event in pulsation activity. The both horizontally and vertically widespread ionospheric effect (electron density decrease) explains a change of the polarisation angle by about ten degrees in the local field line resonance (FLR) band. However, the most significant solar eclipse effect was identified as dramatic clockwise rotation (up to 70 degrees) of the polarisation ellipse of Pc3, Pc4 and Pc5 pulsations. Pulsation data exhibit a strong amplitude decrease (roughly by a factor of two) in and around the totality spot of the eclipse. The decrease is most significant at the local field line resonance (FLR) period. In the actual case, the FLR decrease swept over Europe with a speed being similar to the speed of the dark spot. We suppose that the FLR mechanism was disturbed by the change of particle distribution along the field lines ending in the dark zone due to upward propagation of the electron density decrease caused by the lack of ionising solar radiation in the E-layer of the ionosphere. Thus, the FLR mechanism can be disturbed both from outside, by a sudden change of the interplanetary magnetic field (Verő et al. 1998) and from inside, by a change of the particle density/distribution along the actual field line.

Keywords

field line resonance geomagnetic pulsations interplanetary space ionosphere polarisation solar eclipse upstream waves 

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Copyright information

© Akadémiai Kiadó 2007

Authors and Affiliations

  • P. Bencze
    • 1
  • B. Heilig
    • 2
  • B. Zieger
    • 1
  • J. Szendrői
    • 1
  • J. Verő
    • 1
  • H. Lühr
    • 3
  • K. Yumoto
    • 4
  • Y. Tanaka
    • 5
  • J. Střeštík
    • 6
  1. 1.Geodetic and Geophysical Research Institute of the Hungarian Academy of SciencesSopronHungary
  2. 2.Tihany Observatory, Department of Earth PhysicsEötvös Loránd Geophysical Institute of HungaryTihanyHungary
  3. 3.GeoForschungsZentrum PotsdamPotsdamGermany
  4. 4.Department of Earth and Planetary SciencesKyushu University 33FukuokaJapan
  5. 5.International Arctic Environment Research Project GroupNational Institute of Information and Communications TechnologyKoganei, TokyoJapan
  6. 6.Geophysical InstituteAcademy of Sciences of the Czech RepublicPraha 4Czech Republic

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