We analyzed and systemized the published data on satellite and rocket long-term measurements of the oxygen atom O(3P) (63 μm) and of the СО2 molecule (15 μm) infrared (IR) emissions in the upper atmosphere. We revealed and presented empirical ratios describing the diurnal, seasonal, and latitudinal variations in the intensities of these emissions, their height distribution, as well as their dependence on solar activity. We analyzed photochemical atmospheric processes leading to the emergence of O(3P) (63 μm) and of СО2 (15 μm) emissions in the upper atmosphere.
We present the results of studying the state of the neutral upper atmosphere and the ionosphere over the Eastern Siberia region during minor winter sudden stratosphere warming (SSW) in early February, 2016 and final stratospheric warming in early March, 2016. We used the data from spectrometric measurements of OH (~87 km, 834.0 nm, (6-2)) and At O2 (~94 km, 864.5 nm, (0-1)) emissions from the Geophysical Observatory at the Institute of Solar-Terrestrial Physics SB RAS (51.8°N, 103.1°E, Tory). We also used the vertical sounding data on the peak electron density (NmF2), and on the peak height (hmF2). These data were obtained with the DPS-4 Irkutsk ionosonde (52.3°N, 104.3°E). For the analysis, we also involved the MLS Aura satellite data of measuring vertical temperature profiles and the MERRA reanalysis data. We found the MLT and ionospheric signatures for both analyzed SSWs. At MLT heights, a significant increase in the OH and O2 emission intensities, a decrease in the atmosphere temperature, and an increase in wave activity were found. In the F2-region, we revealed significant (up to ~80 %) NmF2 positive disturbances in the postmidnight hours, which are not associated with geomagnetic activity variations. The revealed effects can be caused by the intensification of the activity of atmospheric waves and the enhancement of vertical transport of atmospheric components caused by stratospheric warmings.
We calculated the absolute integrated intensity of the continuum emission infrared components using the laboratoryobtained rates of photochemical reaction between nitric oxide molecules and oxygen atoms, as well as with non-excited and excited ozone molecules. Altitude distribution of the intensity of continuum radiation in atmosphere in infrared region of a spectrum covers a range of heights of the middle atmosphere from 10 up to 15 km with a maximum at height about 30 km.
On the basis of spectral observations of the hydroxyl emission (band (6-2), 834 nm) in the Eastern Siberia, at Tory (52N, 103E), and in
the European Russia, at Zvenigorod (55.7N, 36.8E), during 2008-2011 the statistically significant seasonal variations of the
mesopause temperature and its day-to-day and night variabilities are revealed. Standard deviations of temperature were used as
parameters of its variability, which allow us to analyze the seasonal activity of planetary waves, tides and internal gravitational waves.
The comparison of the results, obtained in different regions of Russia, shows higher values of variability of the mesopause temperature
in the Eastern Siberia.
On the basis of the photochemical model for atomic oxygen [OI] 558 nm nightglow emission and an approximate
expression for the altitude distribution of the atomic oxygen density in the MLT region at night, we develop a method for
deriving the peak density of atomic oxygen in the MLT region from atomic oxygen [OI] 558 nm nightglow intensity. By
using this method, the peak density of atomic oxygen is derived from the 558 nm airglow data received at the ISTP SB
RAS Geophysical observatory in 2000-2004. The nocturnal variations and the seasonal variations of 558 nm airglow
intensity and the derived peak density of atomic oxygen are considered. The results show that nocturnal variation of the
558 nm airglow intensity changes with season and that the monthly mean 558 nm airglow intensity changes with month,
showing peaks in March, June and October, and larger values in the winter months The nocturnal and the seasonal
variations of the peak density of atomic oxygen are generally similar to those of 558 nm airglow intensity.
We present preliminary analysis of experimental data of the nightglow observation of the atomic oxygen 557.7 nm
(emitting layer height is 85-115 km) and 630 nm (180-250 km) lines emissions in the 23-rd solar cycle. The
experimental data were obtained at ISTP Geophysical observatory near Irkutsk (52° N, 103° E). The 557.7 nm and 630
nm emissions observational data are compared with atmospheric, solar and geophysical parameters. Generally, the 630
nm emission intensity in the 23-rd solar cycle changed in a phase with the solar cycle, increasing from the period of low
solar activity to the period of high solar activity. The difference of correlation coefficient between green line intensity
and F10.7 solar radio flux in various phases of the 23-rd solar cycle was marked. During the increasing and maximum
phases of the solar cycle the negative correlation between monthly mean values of the 557.7 nm emission intensity and
the F10.7 was revealed. The correlation became positive during the descending phase.
Broken phase synchronism of 557.7 nm emission behavior and F10.7 during the growth and maximum phase of the 23-rd solar cycle is preliminary interpreted by high sensitivity of the atmospheric parameters determining 557.7 nm
emission intensity to atmospheric dynamics and various disturbances including the effects from lower atmospheric
We investigate the influence of stratospheric warming on 557.7 nm airglow variations on the basis of the experimental
data received at the ISTP SB RAS Geophysical observatory (52°N, 103°E) in 1998-2005. In the researched period some
cases of abnormal behavior of 557.7 nm airglow intensity in absence of strong geomagnetic disturbances have been
found out. We revealed, that these significant increasing of 557.7 nm airglow intensity concerning to mesosphere-low
thermosphere heights, are caused by strong stratospheric warming when disturbances cover the big range of atmosphere
heights. It is emphasized, that for the Asian region, and, in particular, for the region of Eastern Siberia, there is a big
concentration of stratospheric warming centers that can result in occurring regional features in airglow characteristics.
Upper-atmospheric airglow observations were used to investigate the seasonal variation of upper-atmospheric emission in the atomic oyxgen 558 nm line over the region of East Siberia. There is a qualitative agreement with the seasonal variations of 558 nm emission obtained in preceding decades at other mid-latitude stations, as well as with model approximations. Quantitative differences of the seasonal variation of 558 nm emission for the region of East Siberia are considered, which imply a more pronounced autumn maximum and larger values of monthly mean 558 nm emission intensities in the winter months. An analysis of the factors and phenomena that are responsible for the seasonal variation of 558 nm emission, and a comparision with the wind regime dynamics of the upper mesosphere - lower thermosphere as well as with stratospheric warmings in the region of East Siberia suggests the existence regional features in the seasonal variation of 558 nm emission.