Other
Scientific paper
Dec 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsa42a..07c&link_type=abstract
American Geophysical Union, Fall Meeting 2008, abstract #SA42A-07
Other
2403 Active Experiments, 2431 Ionosphere/Magnetosphere Interactions (2736), 2471 Plasma Waves And Instabilities (2772), 2487 Wave Propagation (0689, 3285, 4275, 4455, 6934), 2752 Mhd Waves And Instabilities (2149, 6050, 7836)
Scientific paper
Modulated ionospheric heating at ULF frequencies using the HAARP heater was performed from April 28 to May 3, 2008 (http://www.haarp.alaska.edu). Simultaneous ground-based ULF measurements were made locally at Gakona, AK and at Lake Ozette, WA that is 2000 km away. The ground-based results showed that ULF amplitudes measured at Gakona are mostly proportional to the electrojet strength above HAARP, indicating electrojet modulation to be the source of the local ULF waves. However, the timing of ULF events recorded at Lake Ozette did not correlated with the electrojet strength at Gakona, indicating that modulation of F region pressure is the more likely source for distant ULF waves. These observations are consistent with the theoretical understanding that ULF waves generated by current modulation are shear Alfven waves propagating along the magnetic field line, thus at high latitude their observations are limited to the vicinity of the heated spot. On the other hand, propagation of ULF waves at significant lateral distances requires generation of magnetosonic waves since they are the only mode that propagates isotropically and can thus couple efficiently in the Alfvenic duct. In addition to ground-based observations, the DEMETER satellite also provided space measurements of the heating effects during its passes over HAARP. The DEMETER results showed direct detection of HAARP ULF waves at 0.1 Hz. Moreover, density dips were observed every time HAARP was operated at CW mode, which provides clear evidence of duct formation by direct HF heating at F peak. Details of these results will be presented at the meeting. We would like to acknowledge the support provided by the HAARP facility during our ULF experiments.
Chang Chulhoon
Doxas Isidoros
Labenski John
Milikh Gennady
Papadopoulos Demetrios
No associations
LandOfFree
Ground and Satellite Observations of ULF Waves Artificially Produced by HAARP 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 Ground and Satellite Observations of ULF Waves Artificially Produced by HAARP, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Ground and Satellite Observations of ULF Waves Artificially Produced by HAARP will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1245455