Physics – Plasma Physics
Scientific paper
Dec 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsa42a..03l&link_type=abstract
American Geophysical Union, Fall Meeting 2011, abstract #SA42A-03
Physics
Plasma Physics
[2403] Ionosphere / Active Experiments, [2461] Ionosphere / Plasma Interactions With Dust And Aerosols, [3332] Atmospheric Processes / Mesospheric Dynamics, [7863] Space Plasma Physics / Turbulence
Scientific paper
In a unique experiment at EISCAT, located in northern Norway and executed in July 2011, Polar Mesospheric Summer Echoes (PMSE) have been observed in the zenith at four different radar frequencies (933, 224, 56 and 7.9 MHz) simultaneously whilst artificially heating the electrons with high-frequency radio waves. Increasing the electron temperature reduces PMSE backscatter power at VHF but may increase it at HF, while the opposite may happen during the relaxation period following heater off. The PMSE backscatter power depends on many parameters, including dust size and charge, radar frequency and electron temperature. By observing the artificially modified PMSE at multiple radar frequencies, it may be possible to uniquely determine dust parameters as a function of altitude. Validation of PMSE theories and its behaviour under electron heating employing this unique set of observations are underway. In addition, high aspect angle observations of the PMSE were obtained at 224 MHz with 66 degrees zenith angle. These clearly show that PMSE can be observed at very high aspect angle, at least for VHF, contrary to results from earlier attempts to investigate PMSE's aspect sensitivity behaviour that has a bearing on the geometry of the electron density irregularities that cause the scattering. Preliminary results from the campaign are presented.
Haggstrom Ingemar
Havnes Ove
Kosch Mike
La Hoz Cesar
Pinedo H.
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