Magnetospheric VLF line radiation observed at Halley, Antarctica
نویسندگان
چکیده
منابع مشابه
On the Origin of Magnetospheric Line Radiation
We present a short overview of results obtained by a systematic survey of line radiation events observed by the DEMETER spacecraft at an altitude of 700 km. We find two different classes of events that can be easily distinguished by the observed frequency separation of lines forming the event – if it is 50/100 Hz or 60/120 Hz then the event is most probably caused by electromagnetic radiation f...
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The influence of man-made activity on the ionosphere may be very important. The effects induced by the Power Line Harmonic Radiation (PLHR) may change the natural wave activity and/or the ionospheric plasma components. One goal of the ionospheric satellite DEMETER launched in June 2004 is to study the ionospheric perturbations which could be related to this anthropogenic activity. As the first ...
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A detailed analysis of the VLF emissions data obtained during occasional whistler campaigns at the low-latitude ground station Agra (geomagnetic latitude 17°1¢ N, L = 1.15) has yielded some unusual discrete VLF emissions of the rising type. These include (1) emissions occurring at time intervals increasing in geommetrical progression, (2) emissions occuring simultaneously in dierent frequency ...
متن کاملEvidence of transverse magnetospheric field line oscillations as observed from Cluster and ground magnetometers
The dynamic spectrum of ULF waves from magnetic field data obtained by the elliptically orbiting Cluster satellites (with an apogee of 119 000 km, perigee of 19 000 km and the orbital period of 57 h) have been prepared in the frequency range 0 to 120 mHz when the satellite was near its perigee. The existence of field line oscillations, with increasing frequency in the inbound sector and decreas...
متن کاملOn the nonlinear triggering of VLF emissions by power line harmonic radiation
VLF ground data from Porojarvi in N. Finland has been presented. Spectrograms reveal frequent occurrence of power line harmonic radiation (PLHR), originating from the Finnish power system and from heavy industrial plant. The radiation is seen to penetrate the magnetosphere since numerous occurrences of PLHR triggered emissions are seen. Risers predominate but fallers and hooks are also observed...
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ژورنال
عنوان ژورنال: Planetary and Space Science
سال: 1981
ISSN: 0032-0633
DOI: 10.1016/0032-0633(81)90142-2