Orographic Disturbances of Upper Atmosphere Emissions

There are some increases of the temperature of the hydroxyl emission (delta T approximately 20 K, z approximately 90 km) and of the intensity of the 63000 oxygen emission (delta I/I approximately 20 per cent, z approximately 250 km) for the lee of the mountains at distances about 150 km in the case of the latitudinal direction of the wind (U approximately 10 m/s) at the 3000 m level. Airflow motions over mountains may be one of the possible processes of generation of wave disturbances penetrating into the upper atmospheres (HINES, 1974; LINDZEN, 1971). The purpose here is to study the penetration of orographic disturbances into upper atmosphere. Airplane measurements of emission variations of hydroxyl and atomic oxygen 6300 A near the Northern Ural mountains were made. Several nocturnal flights were carried out in March, 1980 and January to February, 1981 at heights about 3000 m along 64 deg northern latitude in the Ural region. Spectrographs SP-48 with electronic image converters registration for OH ((9,4) and (5,1) bands - 7700 to 8100 A) and OI (6300 A) emissions were used. The zenith region was observed, and exposure time was 2 minutes. This corresponds to averaging of the emission intensities along the airplane trace over a distance of 10 km. Simultaneous measurements of atmospheric temperature variations at the flight altitude were made

Statistical properties of the helium emission

Statistical analysis of solar cycle effects on helium emission spectra in upper atmospher

Certain properties of the hydroxyl emission

Intensity and rotational temperature variations of oxygen hydrogen bands in airglo

Lunar Tidal Variations of Hydroxyl Emission

313-314The intensities and rotational temperatures of upper atmospheric hydroxyl emission have regular variations with a period of the moon's age. The values of ΔI/I, ΔTrot/Trot and ΔTvibr./Tvibr. Show variations with the moon's age and have a maximum of 30% in the case of intensity, 6% in the case of rotational temperature and 15% in the case of vibrational temperature for the mean annual lunar variations

Relation between Disturbed Variations of Hydroxyl Emission & Radio Wave Absorption in D Region

314-316The variations of hydroxyl emission and radio wave absorption after geomagnetic storms in middle latitudes are observed to be similar. A correlation between these values is noted

Estimation of past solar and upper atmosphere conditions from historical and modern auroral observations

On the basis of the analysis of the data of auroral observations at middle latitudes during low solar activity, and modern spectrophotometric research, the feasibility of their joint use for the estimation of the level of the solar activity during periods without instrumental measurements is discussed. In this paper an attempt is undertaken to determine quantitative information on solar activity by comparing the data of visual auroral observations with the modern parameter of their luminescence

Orographic Disturbances in the Upper Atmosphere Stipulated by Air Currents Streamlining of Great Caucasus Range

Измерения температуры мезопаузы в северной подветренной области Кавказского хребта позволили получить уникальные сведения о характеристиках орографических возмущений на высотах мезопаузы и особенностях их генерации в приземной атмосфере. Температура на высотах ~ 90 км в подветренной области гор имеет максимум ~ 10 К на расстоянии ~ 150 км от хребта. Источники волновых возмущений возникают в тропосфере примерно на высотах 4 км над Кавказским хребтомMeasurements of mesopause temperature in northern leeward area of the Caucasian ridge have allowed to obtain unique data on characteristics of orographical disturbances at heights of mesopause and of their generation processes in a ground atmosphere. The temperature at heights ~ 90 km in leeward area of mountains has a maximum ~ 10 K on distance about 150 km from a ridge. Sources of wave disturbances arise in troposphere approximately at heights of 4 km above the Caucasian ridg