Результаты исследований: Научные публикации в периодических изданиях › статья › Рецензирование
Sharp boundary between the inner magnetosphere and active outer plasma sheet. / Sergeev, V. A.; Sauvaud, J. A.; Reme, H.; Balogh, A.; Daly, P.; Zong, Q. G.; Angelopoulos, V.; Andre, M.; Vaivads, A.
в: Geophysical Research Letters, Том 30, № 15, 1799, 06.08.2003, стр. SSC 3-1 - 3-4.Результаты исследований: Научные публикации в периодических изданиях › статья › Рецензирование
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TY - JOUR
T1 - Sharp boundary between the inner magnetosphere and active outer plasma sheet
AU - Sergeev, V. A.
AU - Sauvaud, J. A.
AU - Reme, H.
AU - Balogh, A.
AU - Daly, P.
AU - Zong, Q. G.
AU - Angelopoulos, V.
AU - Andre, M.
AU - Vaivads, A.
PY - 2003/8/6
Y1 - 2003/8/6
N2 - We report observations of a sharp spatial boundary between the outer plasma sheet and the inner magnetosphere. It was successively crossed by the Cluster spacecraft in their pearl-on-string configuration near the perigee (∼4 Re) at midnight during a substorm expansion phase. Being mapped presumably to 8-10 Re in the equatorial tail, this boundary was extremely thin, comparable to a gyroradius of plasma sheet proton. Substantial changes on this spatial scale were observed coherently in (1) the fluxes of radiation belt energetic electrons (exceeding a factor 10 at E ≥ 100 keV), (2) the plasma pressure (by a factor of 2), (3) the density and outflow of the cold ionospheric plasma. Strong diverging electric field (azimuthal shear flow) coincides with this boundary and is accompanied by a strong downward field-aligned current. While this boundary was staying at nearly the same location during the ∼5 min time scale, we also found indications of its dynamical origin. We suppose it could be generated by a sudden braking and azimuthal deflection of localized bursty fast flows produced by the magnetic reconnection which was going on at this time in the near tail.
AB - We report observations of a sharp spatial boundary between the outer plasma sheet and the inner magnetosphere. It was successively crossed by the Cluster spacecraft in their pearl-on-string configuration near the perigee (∼4 Re) at midnight during a substorm expansion phase. Being mapped presumably to 8-10 Re in the equatorial tail, this boundary was extremely thin, comparable to a gyroradius of plasma sheet proton. Substantial changes on this spatial scale were observed coherently in (1) the fluxes of radiation belt energetic electrons (exceeding a factor 10 at E ≥ 100 keV), (2) the plasma pressure (by a factor of 2), (3) the density and outflow of the cold ionospheric plasma. Strong diverging electric field (azimuthal shear flow) coincides with this boundary and is accompanied by a strong downward field-aligned current. While this boundary was staying at nearly the same location during the ∼5 min time scale, we also found indications of its dynamical origin. We suppose it could be generated by a sudden braking and azimuthal deflection of localized bursty fast flows produced by the magnetic reconnection which was going on at this time in the near tail.
UR - http://www.scopus.com/inward/record.url?scp=0242274068&partnerID=8YFLogxK
U2 - 10.1029/2003GL017095
DO - 10.1029/2003GL017095
M3 - Article
VL - 30
SP - SSC 3-1 - 3-4
JO - Geophysical Research Letters
JF - Geophysical Research Letters
SN - 0094-8276
IS - 15
M1 - 1799
ER -
ID: 36755088