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 


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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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