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Titolo:
Sharp decreases of solar metric radio storm emission
Autore:
Chertok, IM; Kahler, S; Aurass, H; Gnezdilov, AA;
Indirizzi:
IZMIRAN, Troitsk 142190, Moscow Region, Russia IZMIRAN Troitsk Moscow Region Russia 142190 142190, Moscow Region, Russia USAF, Res Lab, Hanscom AFB, MA 01731 USA USAF Hanscom AFB MA USA 01731USAF, Res Lab, Hanscom AFB, MA 01731 USA Astrophys Inst Potsdam, D-14482 Potsdam, Germany Astrophys Inst Potsdam Potsdam Germany D-14482 D-14482 Potsdam, Germany
Titolo Testata:
SOLAR PHYSICS
fascicolo: 2, volume: 202, anno: 2001,
pagine: 337 - 354
SICI:
0038-0938(2001)202:2<337:SDOSMR>2.0.ZU;2-J
Fonte:
ISI
Lingua:
ENG
Soggetto:
CORONAL MASS EJECTIONS; NOISE STORM; CONTINUUM DEPRESSIONS; ACTIVE REGIONS; ENERGY-RELEASE; ACCELERATION; ELECTRONS; FLARES; ASSOCIATION;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
44
Recensione:
Indirizzi per estratti:
Indirizzo: Chertok, IM IZMIRAN, Troitsk 142190, Moscow Region, Russia IZMIRAN Troitsk Moscow Region Russia 142190 ow Region, Russia
Citazione:
I.M. Chertok et al., "Sharp decreases of solar metric radio storm emission", SOLAR PHYS, 202(2), 2001, pp. 337-354

Abstract

We discuss a little-known variety of sharp decreases of long-duration meter-wavelength noise storms and type IV bursts. A survey of the IZMIRAN and AIP radio observations shows that a decrease or nearly complete disappearance of the continuum and bursts developing over tens of minutes without a subsequent recovery of the radio flux occasionally occurs. The decrease is usually preceded by a short-duration (several tens of minutes) enhancement of the radio emission. In these events, the onset of the flux decrease drifts from high to low frequencies with a rate of -(0.05-0.35) MHz s(-1), comparable to the drift rates of noise-storm onsets and of chains of type I bursts. White-light coronagraph observations, as well as the characteristics of the accompanying microwave and soft X-ray emissions, provide evidence that such radio decreases appear to be associated with coronal mass ejections (CMEs) and post-CME phenomena. Yohkoh/SXT images show radio flux decrease events which are accompanied by significant rearrangements of coronal structures. We suggest that the radio flux variations are caused by CME interactionswith pre-existing coronal arcade structures which are sources of noise storms and energetic electron acceleration. The fact that the noise-storm decreases develop with delays of several tens of minutes relative to the associated microwave burst peak, when the corresponding CME front is located at heights of several R-circle dot, however, is not explained.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 04/07/20 alle ore 18:28:53