Transpolar aurora: time evolution, associated convection patterns, and a possible causeстатья
Статья опубликована в высокорейтинговом журнале
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Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
Аннотация:We present two event studies illustrating the detailed
relationships between plasma convection, field-aligned
currents, and polar auroral emissions, as well as illustrating
the influence of the Interplanetary Magnetic Field’s ycomponent
on theta aurora development. The transpolar arc
of the theta aurorae moves across the entire polar region and
becomes part of the opposite side of the auroral oval. Electric
and magnetic field and precipitating particle data are provided
by DMSP, while the POLAR UVI instrument provides
measurements of auroral emissions. Ionospheric electrostatic
potential patterns are calculated at different times during the
evolution of the theta aurora using the KTH model. These
model patterns are compared to the convection predicted by
mapping the magnetopause electric field to the ionosphere
using the Paraboloid Model of the magnetosphere. The
model predicts that parallel electric fields are set up along
the magnetic field lines projecting to the transpolar aurora.
Their possible role in the acceleration of the auroral electrons
is discussed.