Sun-Earth connection: Boundary layer waves and auroras

Citation
Gs. Lakhina et al., Sun-Earth connection: Boundary layer waves and auroras, PRAMANA-J P, 55(5-6), 2000, pp. 665-683
Citations number
76
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Physics
Journal title
PRAMANA-JOURNAL OF PHYSICS
ISSN journal
0304-4289 → ACNP
Volume
55
Issue
5-6
Year of publication
2000
Pages
665 - 683
Database
ISI
SICI code
0304-4289(200011/12)55:5-6<665:SCBLWA>2.0.ZU;2-1
Abstract
Boundary layers are the sites where energy and momentum are exchanged betwe en two distinct plasmas. Boundary layers occurring in space plasmas can sup port a wide spectrum of plasma waves spanning a frequency range of a few mH z to 100 kHz and beyond. The main characteristics of the broadband plasma w aves (with frequencies > 1 Hz) observed in the magnetopause, polar cap, and plasma sheet boundary layers are described. The rapid pitch angle scatteri ng of energetic particles via cyclotron resonant interactions with the wave s can provide sufficient precipitated energy flux to the ionosphere to crea te the diffused auroral oval. The broadband plasma waves may also play an i mportant role in the processes of local heating/acceleration of the boundar y layer plasma.