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Titolo:
CRRES observation of Pi2 pulsations: Wave mode inside and outside the plasmasphere
Autore:
Takahashi, K; Ohtani, S; Hughes, WJ; Anderson, RR;
Indirizzi:
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 Univ Iowa, Dept Phys & Astron, Iowa City, IA 52242 USA Univ Iowa Iowa City IA USA 52242 t Phys & Astron, Iowa City, IA 52242 USA
Titolo Testata:
JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS
fascicolo: A8, volume: 106, anno: 2001,
pagine: 15567 - 15581
SICI:
0148-0227(20010801)106:A8<15567:COOPPW>2.0.ZU;2-K
Fonte:
ISI
Lingua:
ENG
Soggetto:
NEAR-EARTH MAGNETOTAIL; PI-2 PULSATIONS; GEOSTATIONARY ORBIT; INNER MAGNETOSPHERE; SUBSTORM ONSET; GEOMAGNETIC PULSATIONS; STATISTICAL-ANALYSIS; CAVITY RESONANCE; ENERGY-FLOW; SATELLITE;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
51
Recensione:
Indirizzi per estratti:
Indirizzo: Takahashi, K Johns Hopkins Univ, Appl Phys Lab, Johns Hopkins Rd, Laurel, MD 20723 USA Johns Hopkins Univ Johns Hopkins Rd Laurel MD USA 20723 3 USA
Citazione:
K. Takahashi et al., "CRRES observation of Pi2 pulsations: Wave mode inside and outside the plasmasphere", J GEO R-S P, 106(A8), 2001, pp. 15567-15581

Abstract

The relationship between the plasma density and the mode of Pi2-band (40-150 s) waves in the magnetosphere is studied using measurements made from the Combined Release and Radiation Effects Satellite (CRRES). We focus on wave events that occurred From 1100 to 1500 UT on February 17, 1991, on a single CRRES orbit. During this interval the low-latitude ground station Kakioka (L = 1.2) observed a series of Pi2 pulsations within 2 hours of the localtime of CRRES. When CRRES was in the plasmasphere, the poloidal components(E-y, B-x, B-z) at the spacecraft had high coherence with the Pi2 pulsations seen at Kakioka, where E-y, B-x, and B-z are, respectively, the azimuthal component of the electric field and the radial and compressional components of the magnetic field. This relationship lasted until the spacecraft completely moved into the plasmatrough. Waves were present in the plasmatrough, but they did not maintain high coherence with the ground Pi2. For a plasmaspheric event, E-y and B-z oscillated nearly in quadrature, in support of a radially standing wave mode. These results confirm previous AMPTE/CCE magnetic field studies that suggested that fast-mode waves in the inner magnetosphere are the source of low-latitude Pi2 pulsations. In addition, the CRRES results strongly suggest that the outer limit of the "inner magnetosphere" is the plasmapause. The observed wave properties are discussed in light of possible Pi2 mechanisms, including plasmaspheric cavity modes and braking of periodic bursty bulk flows.

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Documento generato il 28/03/20 alle ore 10:38:05