EMIC waves growth and guiding in the presence of cold plasma density irregularities

Autor:	M. de Soria-Santacruz, Maria Spasojevic, Lunjin Chen
Rok vydání:	2013
Předmět:	Geomagnetic storm Physics Wave propagation Equator Electron Geophysics Computational physics Ray tracing (physics) Wavelength symbols.namesake Van Allen radiation belt Physics::Space Physics symbols General Earth and Planetary Sciences Ring current
Zdroj:	Geophysical Research Letters. 40:1940-1944
ISSN:	0094-8276
Popis:	[1] Intense electromagnetic ion cyclotron (EMIC) waves are observed within plasmaspheric plumes during geomagnetic storms and are believed to be a significant driver of loss of both ring current protons and radiation belt electrons. In this study, we use ray tracing together with path-integrated linear growth calculations to analyze the amplification and propagation of EMIC waves within cold plasma density irregularities characteristic of the plasmaspheric plume. All waves are launched at the equator in the range of L = 5 to 7, and wave amplification is analyzed as a function of frequency and initial wave normal angle. These results are compared to a baseline case without irregularities, which show that guiding is possible for irregularity sizes on the order of the EMIC wavelength. Results suggest that typical structures with density levels above and below the average value can result in both areas of increased as well as suppressed wave activity.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::711084212d3024f98af65a207e946178 https://doi.org/10.1002/grl.50484 Zobrazit plný text záznamu Plný text