Polar VLF Emissions Observed by ISIS Satellites

  • T. Ondoh


Polar VLF emissions received from ISIS-1 and -2 at Syowa station, Antarctica inculde polar cusp hiss,auroral hiss, VLF saucer and ELF hiss. High-latitude limit of ELF hiss approximately follows the auroral zone. A polar map of the occurrence rate for broad-band auroral hiss, obtained from ISIS VLF data, is compared to one for the occurrence locations of inverted-V electron precipitations, obtained from Atmospheric Explorer(AE)-D. The occurrence map for broad-band auroral hiss is qualitatively similar to that for the inverted-V electron precipitations; concerning the low-latitude boundary and axial symmetry of the 10–22 hour geomagnetic local time(MLT) meridian. So, the polar occurrence map for broad-band auroral hiss is different from the auroral zone which has the axial symmetry of the noon-midnight meridian. The broad-band auroral hiss seems to be generated by inverted-V electrons precipitated from the boundary plasma sheet, but not by auroral electrons. The broad-band auroral hiss should be hereafter called by the name of the polar hiss. The frequency range of the broad-band auroral hiss is discussed in terms of whistler-mode Cherenkov radiation from inverted-V electrons.


Auroral Zone Auroral Oval Geocentric Distance Geomagnetic Field Line Auroral Electron 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


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Copyright information

© Springer-Verlag Tokyo 1991

Authors and Affiliations

  • T. Ondoh
    • 1
  1. 1.Office for Space ScienceCommunications Research LaboratoryTokyoJapan

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