Author/Authors :
S. Savin، نويسنده , , J. Blecki، نويسنده , , N. Pissarenko، نويسنده , , V. Lutsenko، نويسنده , , I. Kirpichev، نويسنده , , E. Budnik، نويسنده , , N. Borodkova، نويسنده , , M. Nozdrachev، نويسنده , , L. Zelenyi، نويسنده , , V. Romanov، نويسنده , , I. Sandahl، نويسنده , , J-A. Sauvaud، نويسنده , , J. Buechner، نويسنده , , B. Nikutowski، نويسنده , , G. Gustafsson، نويسنده , , K. Stasiewicz ، نويسنده , , V. Korepanov، نويسنده ,
Abstract :
We study the high latitude turbulent boundary layer (TBL), where the essential magnetosheath (MSH) ion heating (in 1.5–3 times) is seen in more than 80 % cases within ‘diamagnetic bubbles’ -structures with highly reduced magnetic field. The high- energy tails of the core particle distributions in TBL exceed 20keV for ions and 10keV for electrons on April 21, 1996. We find indications also for further acceleration of a small fraction of protons there up to 300 keV. More energetic particles could have maximum intensity just inside magnetopause that is consistent with their magnetospheric origin. Simultaneous Polar and Interball-1 data in TBL and MSH on May 29, 1996 demonstrate heating of the MSH core ions in cusp, TBL and stagnant MSH. In the TBL the O+ ions might be heated as well (up to few keV) and even be backscattered towards the ionosphere together with the protons > 18 keV. The dominant incompressible Alfvenic waves in TBL constitute an intermediate chain for the transformation of the solar wind kinetic energy into the auroral particle acceleration/heating. The most intensive energy transformation occurs over cusps and along the boundary between the mantle and low latitude boundary layer down to X= − 6 RE. It provides primary heating for MSH ions in both cusp proper and boundary cusp.
