Electromagnetic waves and electrostatic oscillations in an inhomogeneous plasma structure at the geomagnetic equator

The measurements of the broadband wave radiation in the region of the geomagnetic equator in the topside ionosphere are presented (the APEX satellite experiment). It has been indicated that the electromagnetic radiation, observed in a plasma density pit, could be related to the formation of a large-...

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Bibliographic Details
Published in:Geomagnetism and Aeronomy 2008-10, Vol.48 (5), p.631-641
Main Authors: Izhovkina, N. I., Prutensky, I. S., Pulinets, S. A., Erokhin, N. S., Mikhailovskaya, L. A., Klos, Z., Rothkaehl, H.
Format: Article
Language:English
Subjects:
Aeronomy
Earth and Environmental Science
Earth Sciences
Electromagnetic radiation
Electromagnetism
Equator
Geomagnetic field
Geophysics
Geophysics/Geodesy
Ionosphere
Plasma
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Summary:The measurements of the broadband wave radiation in the region of the geomagnetic equator in the topside ionosphere are presented (the APEX satellite experiment). It has been indicated that the electromagnetic radiation, observed in a plasma density pit, could be related to the formation of a large-scale plasma cavern in the vicinity of the geomagnetic equatorial surface. A large-scale plasma density pit could be formed in the region of heating during damping of plasma vortical structures and electrostatic oscillations, propagating across geomagnetic field lines and crossing the geomagnetic equatorial surface. Brightness of the electromagnetic radiation, observed at frequencies higher than the plasma eigenfrequencies and local plasma and/or upper hybrid frequencies, decreases with increasing eigenfrequencies.
ISSN:0016-7932
1555-645X
0016-7940
DOI:10.1134/S0016793208050083