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Heater-induced phenomena in a coupled ionosphere-magnetosphere system
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2006 (Engelska)Ingår i: Advances in Space Research, ISSN 0273-1177, E-ISSN 1879-1948, Vol. 38, nr 11, s. 2495-2502Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

Experimental results from HF pumping experiments in the nightside auroral E and F region are reported. The experiments were carried out by the use of the EISCAT HF heating facility located near Tromso, Norway, allowing HF pumping the ionosphere in a near magnetic field-aligned direction. We present experimental results from multi-instrument observations related to heater-induced phenomena in a coupled ionosphere-magnetosphere system. The following results have been observed on different occasions: a reverberation effect in scattered signals observed simultaneously on two diagnostic paths which is an indication of Alfven wave generation. This phenomenon was seen under specific disturbed background geophysical conditions, namely, a high electron density in the F region up to 8 MHz produced by soft electron precipitation from the magnetosphere along with low electron density in lower ionosphere; increased ionospheric electric fields; ion outflows from the ionosphere. On another occasion a magnetospheric response to heater turning on and off was found from magnetic pulsation observations over a frequency range up to 5 Hz (the upper frequency limit of the sensitive magnetometer at Kilpisjarvi, located near Tromso). The response manifests itself about 1 min after the heater is turned on and off. Other results have shown the modification of a natural auroral arc and local spiral-like formation. It is thought that a local heater-driven current system is formed. An interesting feature is the generation of the heater-induced ion outflows from the ionosphere. They are observed in night hours under both quiet and disturbed magnetic conditions.

Ort, förlag, år, upplaga, sidor
2006. Vol. 38, nr 11, s. 2495-2502
Nyckelord [en]
ionosphere (active experiments-ionosphere-magnetosphere interaction), radio science (nonlinear phenomena)
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URN: urn:nbn:se:uu:diva-153031DOI: 10.1016/j.asr.2004.12.047ISI: 000202988800031OAI: oai:DiVA.org:uu-153031DiVA, id: diva2:415009
Tillgänglig från: 2011-05-05 Skapad: 2011-05-05 Senast uppdaterad: 2017-12-11Bibliografiskt granskad

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