Abstract
Abstract. The results of investigations into the stimulated electromagnetic emission (SEE) polarization under different modes of the pump wave polarization are presented. The present results were obtained in November 2012 during a heating campaign utilizing the SPEAR (Space Plasma Exploration by Active Radar) heating facility, transmitting in both O- and X-mode polarization, and a PGI (Polar Geophysical Institute) radio interferometer capable of recording the polarization of the received radiation. The polarization ellipse parameters of the SEE DM (downshifted maximum) components were determined under both O-mode and X-mode polarization of the pump waves. The polarization direction of the SEE DM component was preserved under different polarizations of the pump waves. Different polarizations of the pump waves have a different SEE generation efficiency. The intensity of the DM component is observed to be greater during O-mode pumping. In addition, the numbers of observed SEE features are also greater during O-mode pumping.
Highlights
Since the first registration of stimulated electromagnetic emission (SEE), during the heating experiments at Tromsø (Thidé et al, 1982), this phenomenon has been investigated using mainly amplitude methods
The SEE is a weak signal, limited across a frequency band of ∼ 150 kHz around the pump frequency which is generated through the excitation of the ionospheric plasma by powerful radio emissions from a high-frequency (HF) heating facility
This paper focuses on the observation of the SEE polarization parameters under different polarizations of pump waves
Summary
Since the first registration of stimulated electromagnetic emission (SEE), during the heating experiments at Tromsø (Thidé et al, 1982), this phenomenon has been investigated using mainly amplitude methods. The SEE is a weak signal, limited across a frequency band of ∼ 150 kHz around the pump frequency which is generated through the excitation of the ionospheric plasma by powerful radio emissions from a high-frequency (HF) heating facility. In some cases the region of SEE generation may not coincide with the direction of maximum radiation of the pump wave (Carozzi et al, 2001; Tereshchenko et al, 2006). The study of the polarization characteristics of SEE near the fourth harmonic of the electron cyclotron frequency was carried out using the heating facility “Sura” in 1998. In this paper we present the results from a heating campaign utilizing the SPEAR (Space Plasma Exploration by Active Radar, Robinson et al, 2006) heating facility (located near Longyearbyen, Svalbard), which transmits circular polarization, and a radio interferometer capable of recording the polarization of the received radiation (located in Barentsburg, Svalbard). Combined interferometric and polarization measurements allow us to investigate the general characteristics of the polarization of the received radiation and to determine the radiation characteristics from different arrival directions
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