Estimation of the location of the source region of the equatorial noise emissions from the Cluster measurements

0433810 - ÚFA 2015 GR A - Abstrakt
Hrbáčková, Zuzana - Santolík, Ondřej - Pickett, J. S. - Gurnett, D. A.
Estimation of the location of the source region of the equatorial noise emissions from the Cluster measurements.
Geospace revisited: a Cluster/MAARBLE/Van Allen Probes : Book of Abstracts. Athens: National Observatory Of Athens, 2014. s. 140-140.
[Geospace revisited: a Cluster/MAARBLE/Van Allen Probes. 15.09.2014-20.09.2014, Rhodes]
Institucionální podpora: RVO:68378289
http://geospacerev.space.noa.gr/images/BookofAbstracts.pdf

We report the results of the systematic analysis of the data from 10 years of the Cluster WBD measurements. We have searched for occurrence of the equatorial noise (EN) emissions (also known as the fast magnetosonic waves). These waves interact with ions at their characteristic gyrofrequencies and their harmonics. The frequency spectrum therefore consists of many spectral lines with frequency spacings ranging from a few hertz to several tens of hertz. We have used measurements of the WBD instruments which provide us with high-resolution data of electric and magnetic fields. We have found more than 300 events and we have visually checked them for visibility of the spectral lines. We have recorded frequencies of the spectral lines whose intensities of electric field fluctuations were higher than 10−6 nT2Hz−1 and intensities of magnetic field fluctuations were higher than 10−7 nT2Hz−1. We have estimated the locations of the source regions of EN events from the frequency differences of the spectral lines. The results show maximum occurrence rates at distances around 4 RE.
Trvalý link: http://hdl.handle.net/11104/0237955