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Pulsating aurora and quasiperiodic VLF hiss in the auroral zone morning sector: The event of December 30, 2011

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Abstract

The spatial–temporal variations in aurora and VLF emissions during an weak intensification in the auroral zone morning sector on December 30, 2011, have been analyzed. The event was accompanied by a negative bay (~70 nT) in the X component of the magnetic field at ground stations in northern Scandinavia. At the recovery phase of this bay, the precipitation zone moved and VLF emission frequency simultaneously increased over ten minutes, which may indicate that waves and precipitating electrons had a common source. VLF noise bursts in the 600–1000 Hz band with a characteristic modulation scale of ~10 s and the corresponding aurora intensifications localized in the ~100 km region were observed during the following ten minutes, which also confirms that recorded waves are related to electron precipitation. This correspondence of the pulsating aurora periods and VLF noise modulation has been revealed for the first time. The role of VLF wave generation processes during the cyclotron interaction with electrons in the magnetosphere and the propagation of these waves from the magnetosphere to the observation point are discussed.

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Authors and Affiliations

  1. Polar Geophysical Institute (PGI), ul. Fersmana 14, Apatity, Murmansk oblast, 184209, Russia

    B. V. Kozelov & E. E. Titova

  2. Sodankyla Geophysical Observatory, Tahtelantie 62, 99600, Sodankyla, Finland

    J. Manninen

  3. Space Research Institute, Russian Academy of Sciences, Profsoyuznaya ul. 84/32, Moscow, 117997, Russia

    E. E. Titova

Authors
  1. B. V. Kozelov
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  2. J. Manninen
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  3. E. E. Titova
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Correspondence to B. V. Kozelov.

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Original Russian Text © B.V. Kozelov, J. Manninen, E.E. Titova, 2016, published in Kosmicheskie Issledovaniya, 2016, Vol. 54, No. 1, pp. 44–51.

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Kozelov, B.V., Manninen, J. & Titova, E.E. Pulsating aurora and quasiperiodic VLF hiss in the auroral zone morning sector: The event of December 30, 2011. Cosmic Res 54, 40–46 (2016). https://doi.org/10.1134/S0010952516010111

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