Analysis of plasma waves observed within local plasma injections seen in Saturn's magnetosphere

0313482 - ÚFA 2009 RIV US eng J - Článek v odborném periodiku
Menietti, J. D. - Santolík, Ondřej - Rymer, A. M. - Hospodarsky, G. B. - Persoon, A. M. - Gurnett, D. A. - Coats, A. J. - Young, D. T.
Analysis of plasma waves observed within local plasma injections seen in Saturn's magnetosphere.
[Analýza plazmových vln pozorovaných v blízkosti lokálních injekcí plazmatu v magnetosféře Saturnu.]
Journal of Geophysical Research. Roč. 113, č. 5 (2008), A05213/1-A05213/11. ISSN 0148-0227
Grant CEP: GA AV ČR IAA301120601
Výzkumný záměr: CEZ:AV0Z30420517
Klíčová slova: Saturn's magnetosphere * plasma waves * plasma injections
Kód oboru RIV: BL - Fyzika plazmatu a výboje v plynech
Impakt faktor: 3.147, rok: 2008

Plasma injections or density depletion regions have been reported to be a prolific feature of Saturn’s inner magnetosphere. They are characterized by flux tubes of warm, tenuous plasma in a cooler, locally produced plasma background. The injected plasma undergoes dispersion in energy due to gradient and curvature drifts as the flux tube transports. The plasma waves within these injections are of at least two types. Above the electron cyclotron frequency, fce, very intense and narrow-banded emissions resembling electrostatic cyclotron harmonics (ECH) are often observed. Below fce, whistler mode chorus is sometimes observed. Inside the plasma injections there exists a low-energy (<100 eV) electron component which tends to have a field-aligned pitch angle distribution, and a warmer (E > 1000 eV) component with "pancake" pitch angle distributions (peaked at 90). We model the electron plasma distributions observed inside one injection to conduct a linear dispersion analysis of the wave modes.

Pozorování vln v plazmatu v magnetosféře Saturnu spojených s lokálními injekcemi plazmatu.
Trvalý link: http://hdl.handle.net/11104/0164289