Physics
Scientific paper
Dec 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agufmsm52b..02m&link_type=abstract
American Geophysical Union, Fall Meeting 2002, abstract #SM52B-02
Physics
2740 Magnetospheric Configuration And Dynamics, 2744 Magnetotail, 2752 Mhd Waves And Instabilities
Scientific paper
Localized high-speed flows (> 400 km/s), called bursty bulk flows (BBFs), occur frequently in the inner central plasma sheet of Earth's magnetotail. BBFs are observed to occur semi-periodically with a characteristic period of approximately 20 minutes. A large collection of BBF events from 1996 are identified using Geotail magnetic field and plasma data, at times when the spacecraft was located between 10 and 25 Earth radii in the anti-sunward direction. An ensemble BBF time series is constructed using a super-posed epoch analysis of the magnetic field and bulk plasma properties of the individual events. Epoch time is defined by the initial sharp increase in sunward velocity during a BBF, rather than at the time of the peak flow. The super-posed analysis interval spans one hour pre-epoch time to two hours post-epoch time. Fourier analysis of the post-epoch BBF interval reveals strong periodicities in plasma velocity, temperature, and magnetic field. Results of the analyses characterizing these periodicities, as well as representative case studies of BBF events, will be detailed.
Kepko Larry
McCurdy Shannon
Spence Harlan E.
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