Statistical characteristics of bursty flow events

Journal Article · Tue Nov 01 04:00:00 EST 1994 · Journal of Geophysical Research

DOI:https://doi.org/10.1029/94JA01263· OSTI ID:106836

Angelopoulos, V; Kennel, C F; Coroniti, F V; Pellat, R; Kivelson, M G; Walker, R J; Russell, C T ^[1]; Baumjohann, W ^[2]; Feldman, W C; Gosling, J T ^[3]

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1. Univ. of California, Los Angeles, CA (United States)
2. Max-Planck-Institut fuer Extraterrestrische Physik, Garching (Germany)
3. Los Alamos National Laboratory, Los Alamos, NM (United States)

Using a common methodology to analyze data from the AMPTE/IRM and ISEE 2 satellites the authors report on the statistical properties of bursty bulk flow events (BBFs) in the inner plasma sheet (IPS). A positive correlation between BBFs and the AE index suggests that BBFs are predominantly geomagnetically active time phenomena. Earthward BBFs are more frequent close to midnight and away from Earth, up to a distance of {approximately}19 R{sub E}. Tailward BBFs are very infrequent in the IRM data set and somewhat less infrequent in the ISEE 2 data set in the region of the satellites` spatial overlap, possibly due to the more active conditions prevailing during the ISEE 2 mission in that region. However, in both data sets the ratio of tailward to earthward BBFs increases with distance from Earth; more than 20% of all BBFs are anti-sunward tailward of X={minus}19 R{sub E} in the ISEE 2 data set. BBFs are responsible for 60-100% of the measured earthward transport of mass, energy and magnetic flux past the satellite in the regions of maximum occurrence rate, even though they last approximately 10-15% of the IPS observation time there. Thus BBFs represent the primary transport mechanism at those regions. The one-to-one correspondence between BBFs and substorm phase, as well as the relative contribution of BBFs to the total transport observed during substorms are questions that await further investigation based on multi instrument studies of individual events. 44 refs., 19 figs., 5 tabs.

• Sponsoring Organization: USDOE
• OSTI ID: 106836
• Journal Information: Journal of Geophysical Research, Journal Name: Journal of Geophysical Research Journal Issue: A11 Vol. 99; ISSN JGREA2; ISSN 0148-0227
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
ENERGY TRANSFER
MAGNETIC FLUX
MAGNETOTAIL
MASS TRANSFER
PLASMA DRIFT
PLASMA SHEET
TRANSIENTS