共查询到20条相似文献，搜索用时 15 毫秒
1.
G. A. Nasyrov 《Geomagnetism and Aeronomy》2007,47(1):101-103
For the first time, the spatial variations caused by the IGW generated in the troposphere when the air flow around the Kopet-Dag mountain ridge are detected based on the measurements of the spatial distribution of the 557.7 nm atomic oxygen emission intensity. The measurements were carried out at Vannovskii station, the Physicotechnical Institute, Academy of Sciences of the Turkmen SSR. 相似文献
2.
The dynamics of the distribution of nonthermal electrons, injected into a collapsing magnetic trap, has been considered. The electron energy and pitch angle nonstationary spatial distributions in an extensive magnetic trap have been obtained for the first time for different laws of inhomogeneous magnetic field evolution in this trap by numerically solving the Fokker-Planck kinetic equation. The gyrosynchrotron emission intensity has been calculated for the obtained electron spatial distributions. It has been indicated that energetic electrons are effectively accumulated and accelerated at the top of a collapsing trap due to the first-order Fermi and betatron acceleration mechanisms at certain rates of variations in the magnetic field and background plasma density. 相似文献
3.
The empirical model of variations in the atomic oxygen emission intensity depending on different heliogeophysical conditions such as nighttime, lunar time, lunar phase age, season, year, and solar activity level during the 11-year cycle, as well as on cyclic aperiodic activity variations, level of geomagnetic disturbances, and their manifestations in the form of midlatitude subauroral red arcs, has been developed based on the long-term measurements of this emission intensity. 相似文献
4.
The method for determining the rotational temperature of the hydroxyl emission of the upper atmosphere is analyzed. It is shown that a discrepancy of up to 14 K appears in the temperature values determined for the region of OH emission (～87 km) since different researchers use the intensity factors (line strengths) of the lines of the rotational structure of hydroxyl bands based on various theoretical calculations. This discrepancy considerably exceeds the error (2–3 K) of direct temperature measurements. The use of the set of such data in the analysis of the time and spatial temperature regime can lead to a distortion of the character of the long-term changes in the mesopause temperature. Analytical expressions are obtained making it possible to calculate a systematic correction for the temperatures determined with the use of various intensity factors. One should also take into account considerable seasonal variations in the dependence of rotational temperature values on the level of the hydroxyl vibrational excitation. 相似文献
5.
The ground-based and satellite measurements of the upper-atmosphere continuum (continuous emission) intensity in the visible and near IR spectral regions have been analyzed. The data were obtained at the geophysical stations, located in different regions of the globe, and at Mir Space Station. The regularities in the spectral distribution of the continuum emission intensity and emission variations have been revealed for different heliogeophysical conditions. 相似文献
6.
The model of variations in the orthohelium 1083 nm emission intensity has been constructed based on the measurements at different stations. The analytical approximations of the nighttime intensity variations depending on the phase age of the Moon, season, solar activity during the 11-year cycle, and geomagnetic disturbances are presented. 相似文献
7.
Based on the measurements of 656.3-nm emission of atomic hydrogen, we constructed a model of variations in its intensity,
which describes the dependence of diurnal, lunar, seasonal, latitudinal, and long-term variations, during the 11-year cycle
of solar activity, cyclic aperiodic variations, and variations after geomagnetic disturbances. 相似文献
8.
The data on regular variations in the emission intensity of the molecular oxygen Atmospheric system excited in the region of the lower thermosphere have been systematized based on the long-term studies. The empirical approximations of the emission behavior are presented. 相似文献
9.
A. I. Semenov I. V. Medvedeva V. I. Perminov V. Yu. Khomich 《Geomagnetism and Aeronomy》2016,56(5):616-620
Rocket and balloon measurement data on atomic-oxygen (λ 63 µm) emission in the upper atmosphere are presented. The data from the longest (1989–2003) period of measurements of the atomic-oxygen (λ 63 µm) emission intensity obtained by spectral instruments on sounding balloons at an altitude of 38 km at midlatitudes have been systematized and analyzed. Regularities in diurnal and seasonal variations in the intensity of this emission, as well as in its relation with solar activity, have been revealed. 相似文献
10.
It is well known that the 630.0 nm nightglow emission intensity at mid-latitudes increased more than twofold in periods of
maximum sunspot activity. It is assumed that this phenomenon is caused by variations in solar ultraviolet radiation intensity
in solar activity cycles (Fishkova, 1983). 相似文献
11.
Based on observations of mesopause emissions, namely, emissions of hydroxyl (band (6-2)) and molecular oxygen (band (0-1)
of the atmospheric system), their systematic nighttime and seasonal variations are determined at Zvenigorod Observatory in
2000–2008. It is shown that the intensity of hydroxyl emission decreases during the entire night or first half-night, probably
due to the influence of the chemical sink of atomic oxygen on the nighttime behavior of hydroxyl emission. The nighttime behavior
of the intensity of molecular oxygen emission is explained by the action of atmospheric tides. The seasonal behavior of emissions
is characterized by two minima, in April–May and December; it is caused by the annual behavior of the atomic oxygen content,
temperature, and atmospheric density in the emitting layer. Based on the emission data, we determined the seasonal variations
of atomic oxygen at heights of ∼87 km (maximum of hydroxyl emission) and ∼95 km (maximum of molecular oxygen emission). 相似文献
12.
It is well known that the 630-nm nightglow emission intensity in midlatitudes increases by more than a factor of 2 during a sunspot maximum. It has been assumed that the phenomenon is caused by variations in solar UV radiation during a solar cycle (Fishkova, 1983). We present the results of photometric measurements of the nightglow 630.0 nm emission intensity at a latitude of 63° E and longitude of 130° E (Yakutsk) in 1990–2007. The dependence of the 630-nm emission intensity on solar activity on magnetically quiet days in the 22nd and 23rd solar cycles is shown. The close relationship between the 630-nm nightglow intensity and the intensity of extreme UV (EUV) with a correlation coefficient of 0.8–0.9 in 1997–2007 is ascertained from the SOHO/SEM data. The dominance of solar EUV in the excitation of nightglow 630-nm emission has thus been experimentally proved. 相似文献
13.
Rotational temperatures of the 1.58-μm (0–1) band of the Infrared Atmospheric system of molecular oxygen (IRAO2), measured in Zvenigorod (56° N, 36° E), are systematized and analyzed. An empirical dependence of variations in the temperature of the 1.58-μm emission on the solar zenith angle is derived. The use of parameters of the altitude distribution of emission intensity 1.27 μm of middle atmosphere temperature profiles, received from the AURA satellite, allowed for the study of daily variations in the temperature of the 1.58-μm emission. It is revealed that the behavior of these variations corresponds to daily variations in the atmospheric temperature at altitudes of the radiating layer of IRAO2, received from the AURA satellite. 相似文献
14.
A. I. Semenov N. N. Shefov I. V. Medvedeva A. B. Beletsky 《Geomagnetism and Aeronomy》2012,52(2):248-253
On the basis of correlations between seasonal variations in the intensity and temperature of 557.7-nm emission, the mean monthly
longitudinal variations in temperature are drawn. A comparison is performed with the data of interferometer and lidar measurements
of temperature performed at various stations, as well as with the results of satellite studies. The dependences of the amplitudes
of seasonal variations in temperature on latitude are obtained. 相似文献
15.
Summary From the theoretical investigation ofLetfus andApostolov (1974) it follows that under flare conditions the intensive X-ray emission lines in the 1–8 Å range have an insignificant contribution to the ionization state of the lower ionosphere in comparison with the enhanced emission of the continuum. This result is experimentally confirmed by direct comparison of the intensity variations of the emission line 1.87 Å (Fe XXV) during the solar flare of 25 July 1967 measured onboard of the OSO III satellite with simultaneous ground observations of the ionization state variations of the lower ionosphere made by the A3 method. 相似文献
16.
On the basis of the data of ground-based spectrometric observations in Zvenigorod (55.7°N, 36.8°E) and published results of measurements of the intensity of the Infrared Atmospheric system of molecular oxygen obtained at other stations, empirical relations describing variations in the intensity of the 1.58-μm emission for various solar and geophysical conditions are calculated. 相似文献
17.
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18.
The results of rocket and satellite measurements available in the literature of 5.3-μm nitric oxide emission in the upper atmosphere have been systematized and analyzed. Analytical dependences describing the height distribution of volumetric intensity of 5.3-μm emission of the NO molecule and its variations in a range of heights from 100 to 130 km as a function of the time of year, day, latitude, and solar activity have been obtained. 相似文献
19.
Atmospheric gravity waves, detected over Kiruna (67.8°N, 20.4°E) during geomagnetic storms, are presented and analysed. The data include direct measurements of the OI 630.0 nm emission line intensity, the x-component of the local geomagnetic field and thermospheric (meridional and zonal) wind velocities derived from the OI 630.0 nm Doppler shift observed with an imaging Fabry-Perot interferometer (IFPI). A low pass band filter technique was used to determine short-period variations in the thermospheric meridional wind velocities observed during geomagnetic storms. These short-period variations in the meridional wind velocities, which are identified as due to gravity waves, are compared to the corresponding variations observed in the OI 630.0 nm emission line intensity, x-component of the local geomagnetic field and the location of the auroral electrojet. A cross-correlation analysis was used to calculate the propagation velocities of the observed gravity waves. 相似文献
