Optical estimation of auroral ion upflow: Theory
نویسندگان
چکیده
منابع مشابه
Superthermal Ion Signatures of Auroral Acceleration Processes
The retarding ion mass spectrometer on the Dynamics Explorer 1 spacecraft has generated a unique data set which documents, among other things, the occurrence of non-Maxwellian superthermal features in the auroral topside ionosphere distribution functions. In this paper, we provide a representative sampling of the observed features and their spatial morphology as observed at altitudes in the ran...
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We investigate the interaction of O ions with a one-dimensional potential well, using Hamiltonian formulation. Heating of plasma originating in the terrestrial ionosphere plays a catalytic role in solar-driven magnetic storms, which dissipate energy globally within the magnetosphere of the earth. An interesting candidate for ionospheric plasma heating is a potential well located at auroral arcs...
متن کاملAuroral ion outflow: low altitude energization
The SIERRA nightside auroral sounding rocket made observations of the origins of ion upflow, at topside F-region altitudes (below 700 km), comparatively large topside plasma densities (above 20 000/cc), and low energies (10 eV). Upflowing ions with bulk velocities up to 2 km/s are seen in conjunction with the poleward edge of a nightside substorm arc. The upflow is limited within the poleward e...
متن کاملVelocity shear-related ion upflow in the low-altitude ionosphere
Strong ion upflows with field-aligned velocity above 1000 ms−1 were observed by the European Incoherent Scatter (EISCAT) UHF Radar at Tromsø, Norway in the dayside auroral region at heights between 500–600 km during the 15 May 1997 magnetic storm. Both the EISCAT observations and the Assimilative Mapping of Ionospheric Electrodynamics (AMIE) simulation results show that this event occurred in a...
متن کاملIon acceleration through an auroral potential structure: Numerical simulations
We perform numerical simulations for the acceleration of O ions in a potential well which has an exponential form in x-direction with a characteristic length Lx. The oxygen ions are moving in the presence of constant magnetic field Bz and a constant electric field Ey. We trace the orbits of individual particles for different initial conditions (phase angle and kinetic energy). We found that dep...
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ژورنال
عنوان ژورنال: Journal of Geophysical Research: Space Physics
سال: 2007
ISSN: 0148-0227
DOI: 10.1029/2007ja012691