HR: 0800h
AN: SH31B-04    [Abstracts]
TI: Multi-spacecraft study of interplanetary magnetic field depressions Multi-spacecraft Study of Interplanetary Magnetic Field Depressions
AU: * Tatrallyay, M
EM: mariella@rmki.kfki.hu
AF: KFKI Research Inst. Particle and Nuclear Physics, Konkoly Thege ut 29-33., Budapest, 1121, Hungary
AU: Erdos, G
EM: erdos@rmki.kfki.hu
AF: KFKI Research Inst. Particle and Nuclear Physics, Konkoly Thege ut 29-33., Budapest, 1121, Hungary
AB: Magnetic holes were observed in the interplanetary field by the four Cluster spacecraft at different times when the separation between the satellites was ranging from ~500 km to ~10000 km. In several cases the holes appeared in wave trains like quasi-sinusoidal oscillations suggesting that they are not the remnants of long time evolving magnetic dips. The estimation of the size of the magnetic structures was based on the correlation between the magnetic field profiles measured across the holes by the four spacecraft. In case when the depressions could be identified by all four spacecraft, the velocity of the structures was determined by triangulation. This study confirmed that the holes are likely to be frozen in the solar wind flow. The relation between solar wind parameters and the characteristic features of the magnetic holes were also investigated in cases when series of events were observed. Inside several holes, the magnetic field was found to be close to zero.
DE: 2134 Interplanetary magnetic fields
DE: 2149 MHD waves and turbulence (2752, 6050, 7836)
DE: 2164 Solar wind plasma
SC: SPA: Solar and Heliospheric Physics [SH]
MN: 2009 Joint Assembly