Propagation of lower-band whistler-mode waves in the outer Van Allen belt: Systematic analysis of 11 years of multi-component data from the Cluster spacecraft

0429234 - ÚFA 2015 RIV US eng J - Článek v odborném periodiku
Santolík, Ondřej - Macúšová, Eva - Kolmašová, Ivana - Cornilleau-Wehrlin, N. - De Conchy, Y.
Propagation of lower-band whistler-mode waves in the outer Van Allen belt: Systematic analysis of 11 years of multi-component data from the Cluster spacecraft.
Geophysical Research Letters. Roč. 41, č. 8 (2014), s. 2729-2737. ISSN 0094-8276. E-ISSN 1944-8007
Grant CEP: GA MŠMT 7E12026; GA ČR GAP205/10/2279
Institucionální podpora: RVO:68378289
Klíčová slova: whistler-mode chorus * wave vector directions * Van Allen radiation belts
Kód oboru RIV: BL - Fyzika plazmatu a výboje v plynech
Impakt faktor: 4.196, rok: 2014
http://onlinelibrary.wiley.com/doi/10.1002/2014GL059815/abstract

Lower-band whistler-mode emissions can influence the dynamics of the outer Van Allen radiation belts. We use 11 years of measurements of the STAFF-SA instruments onboard the four Cluster spacecraft to systematically build maps of wave propagation parameters as a function of position. We determine probability distributions of wave vector angle weighted by the wave intensity. The results show that wave vector directions of intense waves are close to a Gaussian-shaped peak centered on the local magnetic field line. The width of this peak is between 10 and 20 degrees. The cumulative percentage of oblique waves is below 10–15%. This result is especially significant for an important class of whistler-mode emissions of lower-band chorus at higher latitudes, well outside their source region, where a simple ray tracing model fails and another mechanism is necessary to keep the wave vectors close to the field-aligned direction.
Trvalý link: http://hdl.handle.net/11104/0234374