effect of ionospheric depth on the ionospheric feedback instability: cutoff and subsequent e|| modes
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2010
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Abstract
The ionospheric feedback instability (IFI), which involves feedback
between ionospheric modifications and waves reflected off the magnetosphere,
has up to this point been analyzed in terms of field line integrated
(FLI) ionospheric quantities, that is, with the assumption that the
ionospheric thickness can be ignored. In this work we test this assumption
by solving the two-fluid equations for a representative ionospheric
slab of finite thickness. We find that the results are for the most
part incompatible with a description in terms of FLI quantities, and
that their use can easily lead to an order of magnitude overestimation
of the growth rate. This occurs because the first eigenmode, which
is the one compatible with an FLI description, is cutoff above a certain
frequency, leaving only higher order modes with wavelengths along
B that are subsumed by the slab. Taking the results at face
value, the parallel electric fields associated with the higher order
modes are a possible contributor to electron heating and plasma structure
in the E-region ionosphere.
| Reference Key |
cosgrove2010annaleseffect
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|---|---|
| Authors | ;R. Cosgrove;R. Doe |
| Journal | journal of food measurement and characterization |
| Year | 2010 |
| DOI |
10.5194/angeo-28-1777-2010
|
| URL | |
| Keywords |
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