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11MODULATIONAL EXCITATION OF DENSITY PERTURBATIONS IN
DUSTY IONOSPHERE
T.I. Morozova, S.I. Kopnin, S.I. Popel
1Space Research Institute RAS, Moscow, Russia
2
Moscow Institute of Physics and Technology, Dolgoprudny, Moscow Region,
Russia
timoroz@yandex. ru
Recent studies of ionosphere by electromagnetic waves with frequencies exceeding 1 GHz have shown the presence of density perturbations at the altitudes of 80 to 100 km. This range of altitudes corresponds often to the presence of dust having meteoritic origin [1] or ice grains responsible for an appearance of Noctilucent Clouds and Polar Mesospheric Summer Echoes [2]. Here, we discuss a possibility of excitation of density perturbations due to the development of the modulational instability [3] in plasmas under the conditions of the dusty ionosphere. We investigate the modulational instability of electromagnetic waves with the participation of low-frequency dust acoustic perturbations. We determine the instabiltity rates and thresholds as well as the conditions for its development. We estimate the number densities of the modulational perturbations for monochromatic electromagnetic pumping under HAARP conditions. We show that the modulational interaction [3] can be responsible for an appearance in the ionosphere of the density perturbations of about 1 per cent with respect to the background density. This is in a good agreement with the data of observations.
T.I. Morozova acknowledges the Dynasty Foundation for the financial support.
1. S.I. Kopnin, S.I. Popel, and M.Y. Yu, Phys. Plasmas 16, 063705 (2009), 7 p.
2. A. Yu. Dubinskii and S. I. Popel, JETP Letters 96, 21 (2012).
3. S.V. Vladimirov, V.N. Tsytovich, S.I. Popel, and F.Kh. Khakimov, Modulational Interactions in Plasmas, Kluwer, Dordrecht, 1995, 544 pages.
