Il Nuovo Cimento C

, Volume 19, Issue 4, pp 517–525 | Cite as

Low-frequency (1.7–6.7 mHz) geomagnetic-field fluctuations at high southern latitudes

  • P. Ballatore
  • S. Lepidi
  • L. Cafarella
  • U. Villante
  • A. Meloni
  • M. Candidi
  • P. Palangio


The low-frequency (1.7–6.7 mHz) powers of the horizontal componentsH andD recorded at the Antarctic Italian geomagnetic observatory at Terra Nova Bay (geomagnetic coordinates 77.3S, 279.4 E) during the austral summers 1987/1988 and 1989/1990 have been analysed. The activity level is higher during 1989/1990, corresponding to solar maximum, and theD power is always higher than theH one. The daily power distribution shows, for both components, a significative activity enhancement around the magnetic local noon, which more clearly emerges during quiet magnetospheric conditions. Good correlations have been obtained between the low-frequency power and the solar-wind velocity, the IMF standard deviation and theK p index, suggesting that the low-frequency power is linked both to theK-H instability and to the penetration into the magnetosphere of interplanetary turbulence. Correlation coefficients attain minimum values around the magnetic local noon, when the power level is higher.

PACS 94.30

Physics of the magnetosphere 

PACS 94.30.Ms

Magnetic pulsations 


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Copyright information

© Società Italiana di Fisica 1996

Authors and Affiliations

  • P. Ballatore
    • 1
  • S. Lepidi
    • 2
    • 3
  • L. Cafarella
    • 2
  • U. Villante
    • 3
  • A. Meloni
    • 2
  • M. Candidi
    • 1
  • P. Palangio
    • 2
  1. 1.Istituto di Fisica dello Spazio InterplanetarioFrascati, RomaItaly
  2. 2.Istituto Nazionale di GeofisicaRomaItaly
  3. 3.Dipartimento di Fisica, Università dell'AquilaL'AquilaItaly

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