Frequency structure of IAR spectral bands and ionosphere parameters
Category: 16-2UDC 550.385.37+550.383
T.N. Polyushkina1, B.V. Dovbnya2, A.S. Potapov1, B. Tsegmed1,3, R.A. Rakhmatulin1
1 Institute of Solar-Terrestrial Physics SB RAS, Irkutsk, Russia
2 Borok Geophysical Observatory of Institute of Physics of the Earth RAS, Borok, Yaroslavl region, Russia
3 Research Center for Astronomy and Geophysics MAS, Ulaan-Baator, Mongolia
Abstract. Continuous magnetic observations of IAR emission at the mid-latitude Mondy observatory performed by a search-coil magnetometer LEMI-30 within the period from March 2010 to May 2011 have been analyzed and compared with the results of simultaneous ionosphere sounding. We have studied the morphology of IAR emission and analyzed its relationships with other phenomena and ionospheric parameters. A large amount of observational data allowed us to follow daily and seasonal variations of this relationship which had not been sufficiently studied before. The main factor affecting the duration of the emission is the length of the shading of the lower ionosphere. We have demonstrated a good correlation of diurnal and seasonal IAR frequency variations with the changes in critical frequency f0F2 of the ionosphere. An attempt has been made to simulate diurnal variation of IAR frequency by calculating expected frequency scales of emission using the IRI-2012 model. The results show good agreement with the measurements, but contain systematic and random errors. We discuss the sources thereof.
Keywords: ionospheric Alfven resonator, ionosphere critical frequency f0F2, morphological characteristics, IRI-2012 model.
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