Excitation of the ionospheric Alfvén resonator from the ground: Theory and experiments

Details Excitation of the ionospheric Alfvén resonator from the ground: Theory and experiments Excitation of the ionospheric Alfvén resonator from the ground: Theory and experiments

Oct 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011jgra..11610221s&link_type=abstract

Journal of Geophysical Research, Volume 116, Issue A10, CiteID A10221

Physics

Ionosphere: Active Experiments, Ionosphere: Ionosphere/Magnetosphere Interactions (2736), Ionosphere: Wave Propagation (0689, 3285, 4275, 4455, 6934), Magnetospheric Physics: Mhd Waves And Instabilities (2149, 6050, 7836), Magnetospheric Physics: Numerical Modeling

Scientific paper

We report results from numerical and experimental studies of the excitation of ULF shear Alfvén waves inside the ionospheric Alfvén resonator (IAR) by heating the ionosphere with powerful HF waves launched from the High Frequency Active Auroral Research Program (HAARP) facility in Alaska. Numerical simulations of the two-fluid MHD model describing IAR in a dipole magnetic field geometry with plasma parameters taken from the observations at HAARP during the October-November 2010 experimental campaign reveal that the IAR quality is higher during nighttime conditions, when the ionospheric conductivity is very low. Simulations also reveal that the resonance wave cannot be identified from the magnetic measurements on the ground or at an altitude above 600 km because the magnetic field in this wave has nodes on both ends of the resonator, and the best way to detect IAR modes is by measuring the electric field on low Earth orbit satellites. These theoretical predictions are in good, quantitative agreement with results from observations: In particular, (1) observations from the ground-based magnetometer at the HAARP site demonstrate no significant difference in the amplitudes of the magnetic field generated by HAARP in the frequency range from 0 to 5 Hz, and (2) the DEMETER satellite detected the electric field of the IAR first harmonic at an altitude of 670 km above HAARP during the heating experiment.

Affiliated with

Also associated with

No associations

Rating

Excitation of the ionospheric Alfvén resonator from the ground: Theory and experiments does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Excitation of the ionospheric Alfvén resonator from the ground: Theory and experiments, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Excitation of the ionospheric Alfvén resonator from the ground: Theory and experiments will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1649982