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Titolo:
BIPOLAR ELECTROSTATIC STRUCTURES IN THE SHOCK TRANSITION REGION - EVIDENCE OF ELECTRON PHASE-SPACE HOLES
Autore:
BALE SD; KELLOGG PJ; LARSON DE; LIN RP; GOETZ K; LEPPING RP;
Indirizzi:
UNIV CALIF BERKELEY,SPACE SCI LAB BERKELEY CA 94720 UNIV MINNESOTA,SCH PHYS & ASTRON MINNEAPOLIS MN 55455 NASA,GODDARD SPACE FLIGHT CTR,EXTRATERR PHYS LAB GREENBELT MD 20771 UNIV CALIF BERKELEY,DEPT PHYS BERKELEY CA 94720 OBSERV PARIS,DESPA F-92195 MEUDON FRANCE
Titolo Testata:
Geophysical research letters
fascicolo: 15, volume: 25, anno: 1998,
pagine: 2929 - 2932
SICI:
0094-8276(1998)25:15<2929:BESITS>2.0.ZU;2-U
Fonte:
ISI
Lingua:
ENG
Soggetto:
BOW SHOCK; COLLISIONLESS; WAVES;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
13
Recensione:
Indirizzi per estratti:
Citazione:
S.D. Bale et al., "BIPOLAR ELECTROSTATIC STRUCTURES IN THE SHOCK TRANSITION REGION - EVIDENCE OF ELECTRON PHASE-SPACE HOLES", Geophysical research letters, 25(15), 1998, pp. 2929-2932

Abstract

We present observations of intense, bipolar, electrostatic structuresin the transition region of the terrestrial bow shock from the Wind spacecraft. The electric field signatures are on the order of a tenth of a,millisecond in duration and greater than 100 mV/m in amplitude. The measured electric field is generally larger on the smaller dipole antenna, indicating a small spatial size. We compare the potential on the two dipole antennas with a model of antenna response to a Gaussian potential profile. This result agrees with a spatial scale determined by convection and gives a characteristic scale size of 2 - 7 lambda(d). We interpret the observations as small scale convecting unipolar potential structures, consistent with simulations of electron phase space holes and discuss the results in the context of electron thermalization at strong collisionless shocks.

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Documento generato il 13/07/20 alle ore 18:04:05