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Titolo:
Direct generation of O-mode emission in a dense, warm plasma: Applicationsto interplanetary type II emissions and others in its class
Autore:
Farrell, WM;
Indirizzi:
NASA, Goddard Space Flight Ctr, Greenbelt, MD 20771 USA NASA Greenbelt MDUSA 20771 ard Space Flight Ctr, Greenbelt, MD 20771 USA
Titolo Testata:
JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS
fascicolo: A8, volume: 106, anno: 2001,
pagine: 15701 - 15709
SICI:
0148-0227(20010801)106:A8<15701:DGOOEI>2.0.ZU;2-A
Fonte:
ISI
Lingua:
ENG
Soggetto:
AURORAL KILOMETRIC RADIATION; RADIO EMISSIONS; BERNSTEIN WAVES; FREQUENCY; FORESHOCK; ELECTRONS; SHOCK;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
28
Recensione:
Indirizzi per estratti:
Indirizzo: Farrell, WM NASA, Goddard Space Flight Ctr, Mail Code 695, Greenbelt, MD 20771 USA NASA Mail Code 695 Greenbelt MD USA 20771 enbelt, MD 20771 USA
Citazione:
W.M. Farrell, "Direct generation of O-mode emission in a dense, warm plasma: Applicationsto interplanetary type II emissions and others in its class", J GEO R-S P, 106(A8), 2001, pp. 15701-15709

Abstract

A theory is presented that describes the direct generation of electromagnetic O-mode emission via mildly energetic electron beams in a highly dense and warm plasma. In previous theories, direct generation of O-mode emission from mildly energetic electron beams (1-10 keV) was considered unlikely because the Cerenkov wave phase speeds are much greater that the electron beamvelocity, making the waves and electrons nonresonant. However, it is demonstrated that when cyclotron harmonic and relativistic effects are considered, resonance between particles and waves can occur under the conditions that omega be very near omega (p), and near (but not exactly at) m Omega (e), m being the cyclotron harmonic number. In this case, the calculated wave phase speeds can become very low (<2 x 10(7) m/s), thereby establishing resonance with the electrons. Such conditions do exist in regions where interplanetary type IT emission are generated, in the terrestrial foreshock region,and in planetary magnetospheres.

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Documento generato il 09/07/20 alle ore 00:54:57