Other
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsh31a0373f&link_type=abstract
American Geophysical Union, Fall Meeting 2006, abstract #SH31A-0373
Other
2102 Corotating Streams, 2164 Solar Wind Plasma, 2169 Solar Wind Sources, 7513 Coronal Mass Ejections (2101), 7811 Discontinuities (2109)
Scientific paper
Hot flow anomalies are studied using observations of the FGM magnetometer and the CIS plasma detector aboard the four Cluster spacecraft. The identification of Hot Flow Anomalies (HFAs), discovered nearly 20 years ago near the Earth's bow shock, and their distinction from other events is still not straightforward. We studied general features of HFAs on the basis of Cluster measurements in February-April 2003 and discovered that the solar wind speed is much higher than the average measured during the 3 months. This condition was also confirmed by simultaneous ACE MAG and SWEPAM solar wind observations at the L1 point 1.4 million km far from the Earth. In this paper we are extending our investigation to spring periods in 2005 when the Cluster fleet stayed right outside of the bow shock at varying separation distances. The possible relation between HFAs and CMEs or recurrent fast solar wind streams is examined. The temperature, particle density and pressure parameters observed at the time of HFA formation are also studied and compared to the average values.
Dandouras Iannis
Erdos Géza
Facskó G.
Kecskemety Károly
Tatrall'yay M.
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