New electron gyroharmonic effects in HF scatter from pump-excited magneticfield-aligned ionospheric irregularities

Citation
Pv. Ponomarenko et al., New electron gyroharmonic effects in HF scatter from pump-excited magneticfield-aligned ionospheric irregularities, J GEO R-S P, 104(A5), 1999, pp. 10081-10087
Citations number
39
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Space Sciences
Journal title
JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS
ISSN journal
2169-9380 → ACNP
Volume
104
Issue
A5
Year of publication
1999
Pages
10081 - 10087
Database
ISI
SICI code
0148-0227(19990501)104:A5<10081:NEGEIH>2.0.ZU;2-0
Abstract
Experimental results of resonant high-frequency (HF) scattering from small- scale geomagnetic field-aligned plasma irregularities excited by electromag netic HF pumping of the ionospheric F region from the Sura radio facility i n Russia are reported. These results include the first observations of a mi nimum in the scattered signal intensity when the pump frequency was near th e fourth electron gyroharmonic and of a significant broadening of the frequ ency spectrum of the scattered signal for pump frequencies above the gyroha rmonic. After pump-off, the flanks of the broad spectrum decayed rapidly. T hese new observations link together several previous experimental results o f gyroharmonic effects in phenomena attributed to the excitation of small-s cale field-aligned irregularities and are therefore thought to be significa nt contributions to our understanding of the self-organization of the space plasma under the action of an external perturbation.