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Titolo:
Ground-based and Polar spacecraft observations of a giant (Pg) pulsation and its associated source mechanism
Autore:
Wright, DM; Yeoman, TK; Rae, IJ; Storey, J; Stockton-Chalk, AB; Roeder, JL; Trattner, KJ;
Indirizzi:
Univ Leicester, Dept Phys & Astron, Leicester LE1 7RH, Leics, England UnivLeicester Leicester Leics England LE1 7RH er LE1 7RH, Leics, England Univ Birmingham, Sch Phys & Astron, Birmingham, W Midlands, England Univ Birmingham Birmingham W Midlands England ngham, W Midlands, England Aerospace Corp, Los Angeles, CA 90009 USA Aerospace Corp Los Angeles CA USA 90009 e Corp, Los Angeles, CA 90009 USA Lockheed Martin ATC, Palo Alto, CA 94304 USA Lockheed Martin ATC Palo Alto CA USA 94304 n ATC, Palo Alto, CA 94304 USA
Titolo Testata:
JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS
fascicolo: A6, volume: 106, anno: 2001,
pagine: 10837 - 10852
SICI:
0148-0227(20010601)106:A6<10837:GAPSOO>2.0.ZU;2-S
Fonte:
ISI
Lingua:
ENG
Soggetto:
IONOSPHERIC DOPPLER OSCILLATIONS; ULF GEOMAGNETIC-PULSATIONS; RING CURRENT INSTABILITIES; SPATIAL SCALE SIZES; ALFVEN WAVES; RADAR; GENERATION; PARTICLE; PLASMA; ORBIT;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
46
Recensione:
Indirizzi per estratti:
Indirizzo: Wright, DM Univ Leicester, Dept Phys & Astron, Univ Rd, Leicester LE1 7RH,Leics, England Univ Leicester Univ Rd Leicester Leics England LE1 7RH England
Citazione:
D.M. Wright et al., "Ground-based and Polar spacecraft observations of a giant (Pg) pulsation and its associated source mechanism", J GEO R-S P, 106(A6), 2001, pp. 10837-10852

Abstract

Multi-instrument observations of a Pg pulsation, which occurred on the morning of May 16, 1998, are reported. The wave signature was observed simultaneously on the ground, by the International Monitor for Auroral GeomagneticEffects (IMAGE) magnetometer network and in the ionosphere by the Doppler Pulsation Experiment (DOPE) high resolution HF Doppler sounder. The wave occurred in the morning sector and possessed an azimuthal wave number, m, of 30 +/-5 with a westward phase propagation. Shortly before the Pg commenced,energetic particle instruments on board the Polar spacecraft detected protons with a non-Maxwellian energy distribution drifting westward toward the location of IMAGE and DOPE. An investigation has been undertaken to determine whether these particles were involved in the wave-particle interaction considered responsible for generating the Pg pulsation. Proton energies of around 7 keV, which occur at the low-energy edge of the unstable distribution (where partial derivativef/partial derivativeW > 0), satisfy the drift-bounce resonance relation, omega - m omega (d) = N omega (b), for N=1. This result indicates that this particular wave is likely to be the result of a drift-bounce resonance mechanism and that it has an even mode standing wave structure in the magnetosphere. This result is discussed in terms of previous observations of Pgs.

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Documento generato il 04/07/20 alle ore 21:21:06