Enhanced Fading Rates Produced During Ionospheric Modification
When very high power radiowaves are reflected from the ionosphere, modifications in the physical characteristics of the ambient plasma are produced. These include the production of field aligned plasma striations with scale sizes across the geomagnetic field lines ranging from a few metres to a few...
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| Format: | Text |
| Language: | English |
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1990
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| Online Access: | http://www.dtic.mil/docs/citations/ADP006502 http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADP006502 |
| Summary: | When very high power radiowaves are reflected from the ionosphere, modifications in the physical characteristics of the ambient plasma are produced. These include the production of field aligned plasma striations with scale sizes across the geomagnetic field lines ranging from a few metres to a few kilometres. The presence of these striations produces anomalous absorption of both the heater wave itself and of other HF signals propagating through the modified region. During experiments at Tromso, Norway, with the heating facility constructed by the Max Planck Institut fur Aeronomy, Lindau, West Germany, marked changes in the fading rate of HF signals reflected from the heated volume have been noted. These rapid fluctuations in signal amplitudes are thought to be produced by medium scale striations generated during the heating process. An estimate of scale size of these striations is made from the experimental data. This article is from 'Conference Proceedings on Ionospheric Modifications and its Potential to Enhance or Degrade the Performance of Military Systems held in Bergen, Norway on 28-31 MAY 1990 (La Modification de l'Ionosphere et son Potentiel d'Amelioration ou de Degradation des Performances des Systemes Militaires), AD-A239 823, p12-1 thru p12-7. |
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