Apparent progression of intensity variations of the oxygen red line

Multilayered structures in the ionosphere F2 region and impulse‐like increase of the nightglow red 630 nm line intensity as a result of influence of shear excited atmospheric vortical perturbations

“…The impulse‐like increase in the red line intensity (or BW) propagates with various velocities at midlatitudes [ Misawa et al , 1984; Afraimovich et al , 2002; Colerico et al , 2006]. Note that in the case when the following approximation u 0 = U 0 + ay is possible for the background meridional wind velocity of , the shear wave excited in this flow propagates in the meridional direction with U 0 = const [ Didebulidze and Pataraya , 1999].…”

“…Similar variations in the background meridional wind and the F 2 layer, responsible for the impulse‐like increase (or BW), can be caused by atmospheric waves [ Misawa et al , 1984; Didebulidze and Pataraya , 1989; Afraimovich et al , 2002]. According to Misawa et al [1984] and Afraimovich et al [2002], the atmospheric solitary wave may cause the impulse‐like increase (with duration about 1–3 h) observed on magnetically disturbed days and propagating from polar regions to the south. Similar enhancement in the red line intensity with duration of about 40 min was explained by northward propagation of solitary atmospheric gravity waves [ Didebulidze and Pataraya , 1989].…”

“…The impulse‐like increase (with duration of about 1–3 h) in the total nightglow intensity of the red 630.0 nm line, which is also referred to as brightness wave (BW) [ Colerico et al , 1996], is a well‐known observed phenomenon [ Greenspan , 1966; Nelson and Cogger , 1971; Misawa et al , 1984]. The midlatitude red line is emitted from the ionosphere F 2 region, and the nightly behavior of its intensity is mainly determined by variations in the height profile of the F 2 layer electron density [ Gudadze et al , 2008, and references therein], which in turn is controlled by ambipolar diffusion of ions, their recombination, and thermospheric neutral wind [ Rishbeth and Garriott , 1969].…”

Upper atmosphere nightglow disturbances during the geomagnetic storm of December 15, 2006 over Eastern Siberia

“…A correlation between variations in the 630 nm emission intensity and variations in the h m F 2 altitude during magnetically disturbed periods is noted in many works (see, e.g., [1][2][3]7]). Synchronous varia tions in the 557.7 and 630 nm emission intensities in magnetically disturbed periods are noted in individ ual works, but their origin has not been sufficiently studied.…”

“…It should be noted that disturbances of variations in the 630 nm emission intensity during geomagnetic storms (GS) are relatively well known [1][2][3]. At the same time, results of different studies of the 557.7 nm emission response to GS are of a contradictory char acter [4][5][6][7][8].…”