Diamagnetic Processes of Substorms: Fundamental Results and a New Perspective

Details Diamagnetic Processes of Substorms: Fundamental Results and a New Perspective Diamagnetic Processes of Substorms: Fundamental Results and a New Perspective

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agufmsm71a0562n&link_type=abstract

American Geophysical Union, Fall Meeting 2002, abstract #SM71A-0562

Physics

2700 Magnetospheric Physics, 2744 Magnetotail, 2752 Mhd Waves And Instabilities, 2764 Plasma Sheet, 2788 Storms And Substorms

Scientific paper

By virtue of the Geotail magnetic field and low-energy-particle data, we have investigated the characteristics of substorms that observed in the near-to-mid magnetotail plasma sheet. We focused on the changes of three kinds of energy density considering their primary importance, their relationship and their flux transport. We divided the substorms into the Pi2 oscillatory variation (with a period of 40-150 s) and the background disturbances. Characteristics of the expansion phase determined here include the following: (1) Plasma thermal pressure and the magnetic pressure change exactly out-of-phase. The intensity of the energy flux is stronger in the direction parallel to the magnetic field than in the direction transverse to it. The plasma fluid clearly exhibits the diamagnetic properties; (2) Characteristics are seen on almost all time scales relevant to substorms (both in the Pi2s and background disturbances), and in almost all of the 139 examples. The substance of magnetotail Pi2 is the slow MHD wave, and the nature of background disturbances indicates slow MHD disturbances.

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