Cluster satellite observations of mHz pulsations in the dayside magnetosphere
2006 (English)In: Advances in Space Research, ISSN 0273-1177, Vol. 38, no 8, 1730-1737 p.Article in journal (Refereed) Published
On 17 August 2002 the Cluster spacecraft moved through the dayside magnetosphere. Between 16:00 and 18:30 LIT clear monochromatic oscillations are seen in both electric field and magnetometer data. The frequency is 4.2 mHz in the spacecraft frame of reference. The oscillations have a clear spatial localisation. The magnetic field oscillations are radially polarised in the plane perpendicular to the background magnetic field, indicating that the wave is in the poloidal mode. From the difference in phase between the satellites we estimate the azimuthal wave number, in, to be about 130, consistent with the magnetic field polarisation. The frequency is stable for different L-values as well as over time. From the value of in, the Doppler shift due to satellite motion is estimated to 0.5 mHz. By looking at the phase of the electric and the magnetic field close to the equator we conclude that the oscillations are in a mode with an odd number of half wavelengths between the two ionospheres.
Place, publisher, year, edition, pages
2006. Vol. 38, no 8, 1730-1737 p.
Fusion, Plasma and Space Physics
IdentifiersURN: urn:nbn:se:kth:diva-5813DOI: 10.1016/j.asr.2005.04.103ISI: 000202988500024ScopusID: 2-s2.0-33845991191OAI: oai:DiVA.org:kth-5813DiVA: diva2:10319
QC 20100707. Konferens: 35th COSPAR Scientific Assembly Paris, FRANCE, JUL 18-25, 2004 Comm Space Res.2005-08-252005-08-252012-09-17Bibliographically approved