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Titolo:
Charge exchange contribution to the decay of the ring current, measured byenergetic neutral atoms (ENAs)
Autore:
Jorgensen, AM; Henderson, MG; Roelof, EC; Reeves, GD; Spence, HE;
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 Johns Hopkins Univ, Appl Phys Lab, Laurel, MD 20723 USA Johns Hopkins Univ Laurel MD USA 20723 ppl Phys Lab, Laurel, MD 20723 USA Boston Univ, Ctr Space Phys, Boston, MA 02215 USA Boston Univ Boston MA USA 02215 niv, Ctr Space Phys, Boston, MA 02215 USA
Titolo Testata:
JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS
fascicolo: A2, volume: 106, anno: 2001,
pagine: 1931 - 1937
SICI:
0148-0227(20010201)106:A2<1931:CECTTD>2.0.ZU;2-Z
Fonte:
ISI
Lingua:
ENG
Soggetto:
FEBRUARY 1986; DST INDEX; STORM; POLAR; ASSOCIATION; IMAGES; LOSSES; PHASE;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
30
Recensione:
Indirizzi per estratti:
Indirizzo: Jorgensen, AM Univ Calif Los Alamos Natl Lab, Mail Stop D-466,SM-30,BikiniAtoll Rd, LosAlamos, NM 87545 USA Univ Calif Los Alamos Natl Lab Mail StopD-466,SM-30,Bikini Atoll Rd Los Alamos NM USA 87545
Citazione:
A.M. Jorgensen et al., "Charge exchange contribution to the decay of the ring current, measured byenergetic neutral atoms (ENAs)", J GEO R-S P, 106(A2), 2001, pp. 1931-1937

Abstract

In this paper we calculate the contribution of charge exchange to the decay of the ring current. Past works have suggested that charge exchange of ring current protons is primarily responsible for the decay of the ring current during the late recovery phase, but there is still much debate about thefast decay of the early recovery phase. We use energetic neutral atom (ENA) measurements from Polar to calculate the total ENA energy escape. To get the total ENA escape we apply a forward modeling technique, and to estimatethe total ring current energy escape we use the Dessler-Parker-Sckopke relationship. We find that during the late recovery phase of the March 10, 1998 storm ENAs with energies greater than 17.5 keV can account for 75% of theestimated energy loss from the ring current. During the fast recovery the measured ENAs can only account for a small portion of the total energy loss. We also find that the lifetime of the trapped ions is significantly shorter during the fast recovery phase than during the late recovery phase, suggesting that different processes are operating during the two phases.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 09/12/19 alle ore 11:45:17