Physics
Scientific paper
Dec 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsa11b..01p&link_type=abstract
American Geophysical Union, Fall Meeting 2009, abstract #SA11B-01
Physics
[2403] Ionosphere / Active Experiments
Scientific paper
We present evidence of Ionospheric Current Drive (ICD) by modulated F-region ionospheric HF heating, using the HAARP Ionospheric Research Instrument (IRI). The ICD is different from the conventional low frequency electrojet modulation in that it does not require the presence of ambient currents. The ICD is an oscillatory diamagnetic current driven by the heater created local pressure gradients. The magnetic moment generated by the ICD is directed along the ambient magnetic field. As a result at high latitude F-region heating ICD drives magnetosonic waves that propagate in the Alfvenic duct. Their ground signatures are due to the E-region Hall current generated by the ExB interaction of the electric field of the magnetosonic wave with the ambient magnetic field. Analysis shows that an ionospheric facility located at the dip equator will be by more than 30-40 dB more efficient than at high latitudes. The paper concludes with: (a) a discussion of potential proof-of-principle experiments using the Arecibo heater, currently under construction; and (b) an analysis that indicates that ICD can also be driven in the D/E region and depending on latitude it can inject VLF waves in the earth-ionosphere waveguide or the magnetosphere.
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