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The paper reports first simultaneous observations of artificial emission of 630-nm oxygen red line, along with perturbations of slant total electron content (STEC). They were induced by the high-frequency (HF) ionospheric heating produced by the SURA facility situated near Nijniy Novgorod, Russia. The HF heating affects differently the optical emission and STEC. While the patches of the artificial airglow are close to the area of the reduced STEC, the STEC increases at the periphery of the patches. Thus, the artificial airglow occurs mostly inside the large plasma cavities.

Plain Language Summary The paper reports results of first simultaneous observations of artificial optical emission of atomic oxygen red line, along with perturbations of slant total electron content (STEC) mesured by GPS receivers on the radio paths from navigation satellite. The emission and STEC perturbutions were induced by the high-frequency ionospheric heating produced by the SURA facility situated near Nijniy Novgorod, Russia. The high-frequency heating affects differently the optical emission and STEC. While the patches of the artificial optical emission are close to the area of the reduced STEC, the STEC increases at the periphery of the patches. Thus, it is shown that the artificial optical emission is generated mostly inside the large cavities of the ionospheric plasma.