Physics
Scientific paper
Dec 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsm23b1721e&link_type=abstract
American Geophysical Union, Fall Meeting 2008, abstract #SM23B-1721
Physics
2740 Magnetospheric Configuration And Dynamics, 2744 Magnetotail, 2760 Plasma Convection (2463), 2790 Substorms
Scientific paper
The method described in Wolf et al. [J. Geophys. Res., 111, A12218, doi: 10.1029/2006JA012010] to obtain the instantaneous pV5/3 (specific entropy) of flux tubes from single-satellite measurements of the magnetic field and plasma pressure. The specific entropy is used to investigate the distinction between substorm expansion onsets, pseudobreakups, and convection bays. Fast, earthward flows are comprised of flux tubes of reduced pV5/3, i.e., "bubbles". Flux tubes injected over the satellite at local onset have values of pV5/3 comparable or below geosynchronous values. In pseudobreakups, pV5/3 returns to its larger pre-onset value within a few minutes, while for substorm expansions, pV5/3 remains at depressed levels through the expansion phase. pV5/3/le 0.08 nPa(RE/nT)5/3 (near Earth) during convection bays. The depressed value of pV5/3≤ 0.1 nPa(RE/nT)5/3 during expansions and convection bays implies that pV5/3 is approximately constant with distance in the inner plasma sheet.
Erickson Gary M.
Salman S.
Vigilant T. C.
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