Short-wavelength drift dissipative instability in the presence of field-aligned currents |
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Authors: | A Bhattacharyya GS Lakhina |
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Institution: | Indian Institute of Geomagnetism, Colaba Bombay 400 005, India |
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Abstract: | Sharp density gradients coupled with field-aligned currents can give rise to short wavelength (?15 m) drift waves due to collisional effects in the F-region of the auroral ionosphere. In this wavelength range, ion-ion collisions at altitudes of 300–450 km render the ions unmagnetized and a field-aligned current can drive a drift wave, propagating almost transverse to the magnetic field, unstable due to the resistance in electron parallel motion arising from electron collisions. |
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