Statistical properties of flows in association with dipolarizations in the near-Earth tail

Details Statistical properties of flows in association with dipolarizations in the near-Earth tail Statistical properties of flows in association with dipolarizations in the near-Earth tail

Dec 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsm41a1845k&link_type=abstract

American Geophysical Union, Fall Meeting 2010, abstract #SM41A-1845

Physics

[2744] Magnetospheric Physics / Magnetotail, [2764] Magnetospheric Physics / Plasma Sheet, [2790] Magnetospheric Physics / Substorms

Scientific paper

Using the magnetic field and plasma moment data obtained by the THEMIS satellites (A, D, and E), we selected 320 events of dipolarizations in the near-Earth tail (X(GSM) = -6 ~ -12 RE) for the period from 2008 to 2009 and statistically examined the associated plasma flow properties. First, we found that for most of the dipolarization events, the maximum flow velocity occurs between 1 minute before and 3 minutes after the onset of the corresponding dipolarizations. About 80% of the flow events examined in this study are earthward flows and the other 20% are tailward flows. We also found that the occurrence rate of fast earthward flows is lower toward the Earth, which seems to be consistent with the flow braking scenario. Most of the tailward flow speeds are weak to moderate, less than 500 km/s regardless of the distance from the Earth. On the other hand, the PV5/3 is a useful quantity to describe the plasma sheet dynamics (Pontius and Wolf, 1990). For example, it is generally understood that a dipolarization is associated with a reduction of the PV5/3. Using the Wolf et al. [2006] formula, we estimated the PV5/3 for the dipolarizations, and investigated the possible relationship between the amount (or degree) of the change in PV5/3 across dipolarization onsets and the associated flow speed. We found the statistical tendency that the peak flow speed is approximately proportional to the amount (or degree) of the reduction of PV5/3 after dipolarizations. Interestingly this is found to be the case for both the earthward and tailward flow-associated dipolarizations. Lastly we tried to estimate the possible connection between the near-tail dipolarizations and the response at geosynchronous orbit, the details of which will be presented in this paper.

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