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Titolo:
The storm-substorm relationship: Ion injections in geosynchronous measurements and composite energetic neutral atom images
Autore:
Reeves, GD; Henderson, MG;
Indirizzi:
Univ Calif Los Alamos Natl Lab, Los Alamos, NM 87545 USA Univ Calif Los Alamos Natl Lab Los Alamos NM USA 87545 amos, NM 87545 USA
Titolo Testata:
JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS
fascicolo: A4, volume: 106, anno: 2001,
pagine: 5833 - 5844
SICI:
0148-0227(20010401)106:A4<5833:TSRIII>2.0.ZU;2-6
Fonte:
ISI
Lingua:
ENG
Soggetto:
GEOMAGNETIC DISTURBANCE; DST FIELD; POLAR; ASSOCIATION; PARTICLE; DECAY; ONSET;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
22
Recensione:
Indirizzi per estratti:
Indirizzo: Reeves, GD Univ Calif Los Alamos Natl Lab, NIS-1,MS D-466, Los Alamos, NM 87545 USA Univ Calif Los Alamos Natl Lab NIS-1,MS D-466 Los Alamos NM USA 87545
Citazione:
G.D. Reeves e M.G. Henderson, "The storm-substorm relationship: Ion injections in geosynchronous measurements and composite energetic neutral atom images", J GEO R-S P, 106(A4), 2001, pp. 5833-5844

Abstract

We have analyzed isolated and storm time ion injections using geosynchronous particles, energetic neutral atom (ENA) data, and Dst. There are both surprising similarities between the two classes of events as well as important differences that bear directly on the relationship between storms and substorms. The average geosynchronous ion responses during the growth phase, at onset, and in the approximate to 15 min following onset are nearly identical in intensity, spectral hardness, and temporal profile. ENA observationsconfirm that similarity and additionally show that the two classes of injections span nearly the same extent in local time. The two classes of injections differ primarily in the subsequent behavior of the ion fluxes. For theisolated injections the fluxes return to preevent levels within about an hour, and exhibit the expected westward drift and dispersion. For the storm time injections the fluxes remain elevated for at least several hours following the initial injection. Additionally, the ENA observations show new evidence that the region of new particle injections expands eastward (oppositeto the ion drift direction) to encompass most of the nightside. Within 3 hours, ENA emissions are observed coming from most of the inner magnetosphere but have still not formed a symmetric, trapped distribution. Within thosesame 3 hours Dst decreased an average of 40 nT with the initial decrease observed in the same hour as the initial injection. The isolated injections did not produce a measurable Dst signature. These results show that despitemany remarkable similarities, storm time ion injection events are different from isolated injection events.

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Documento generato il 09/12/19 alle ore 03:41:35