Počet záznamů: 1

Electromagnetic ion cyclotron waves in the helium branch induced by multiple electromagnetic ion cyclotron triggered emissions

  1. 1.
    0367472 - UFA-U 2012 RIV US eng J - Článek v odborném periodiku
    Shoji, M. - Omura, Y. - Grison, Benjamin - Pickett, J. - Dandouras, I. - Engebretson, M.
    Electromagnetic ion cyclotron waves in the helium branch induced by multiple electromagnetic ion cyclotron triggered emissions.
    Geophysical Research Letters. Roč. 38, - (2011), L17102/1-L17102/5 ISSN 0094-8276
    Grant CEP: GA ČR(CZ) GPP209/11/P848
    Výzkumný záměr: CEZ:AV0Z30420517
    Klíčová slova: 1-2 MAGNETIC PULSATIONS * EQUATORIAL MAGNETOSPHERE * DISTRIBUTIONS * STORMS
    Kód oboru RIV: BL - Fyzika plazmatu a výboje v plynech
    Impakt faktor: 3.792, rok: 2011
    http://www.agu.org/pubs/crossref/2011/2011GL048427.shtml

    Electromagnetic ion cyclotron (EMIC) triggered emissions with rising tones between the H(+) and He(+) cyclotron frequencies were found in the inner magnetosphere by the recent Cluster observations. Another type of EMIC wave with a constant frequency is occasionally observed below the He(+) cyclotron frequency after the multiple EMIC triggered emissions. We performed a self-consistent hybrid simulation with a one-dimensional cylindrical magnetic flux model approximating the dipole magnetic field of the Earth's inner magnetosphere. In the presence of energetic protons with a sufficient density and temperature anisotropy, multiple EMIC triggered emissions are reproduced due to the nonlinear wave growth mechanism of rising-tone chorus emissions, and a constant frequency wave in the He(+) EMIC branch is subsequently generated. Through interaction with the multiple EMIC rising-tone emissions, the velocity distribution function of the energetic protons is strongly modified.
    Trvalý link: http://hdl.handle.net/11104/0202145