The Neutral Upper Atmosphere by S. N. Ghosh (auth.)

By S. N. Ghosh (auth.)

After global struggle II, Professor S.K. Mitra wrote a accomplished e-book known as The top Atmosphere, which handled info to be had from ground-based and balloon-borne experiments. hence, themes corresponding to day airglow have been investigated and extra ground-based experiments utilizing incoherent back-scattering have been conducted. those actions led to new info at the ozonosphere.

The dramatic discovery of ozone holes kinds a brand new and fascinating bankruptcy within the discovery of atmospheric strategies. whereas facing the boundaries of the ambience, reference should be made to interstellar molecules whose discovery has raised massive clinical interest. wisdom of the solar-terrestrial courting complicated very much whilst additional info on sunlight radiation turned on hand via measuring larger strength photons within the UV, EUV, or even X-ray regimes.

All this data is integrated during this quantity and awarded less than the identify The impartial higher surroundings.

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The Neutral Upper Atmosphere

After global warfare II, Professor S. okay. Mitra wrote a complete publication known as the higher surroundings, which handled info to be had from ground-based and balloon-borne experiments. accordingly, themes comparable to day airglow have been investigated and extra ground-based experiments utilizing incoherent back-scattering have been conducted.

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4. It is to be noted that stratospheric pollutants are distributed throughout the globe and hence they pose international problems. 6. 2. 10 =. Clio- Bacterial AeroplOllt! 4 Ozone is converted from liquid to gaseous state by F-ll and F-12 by solar UV radiations at 20 km altitude. They release abundantly CI and CIa which participate in catalytic reactions leading to ozone destruction. 2 Absorption of solar radiation by atmospheric ozone Radiation Band Spectral Range (nm) Amount of absorption Effect on living beings UV-A 400-320 slight Relatively harmless UV-B 320-280 partial Lethal to many forms of life UV-C 280-200 total Lethal to man and living organisms Hence we are only concerned with UV-B radiation which affects man, animal, fish and plant.

Hence, the structure of ozone molecule was proposed to be an isosceles triangle with two long equal arms and a small angle between them. But this structure is not in agreement with other data. Ultimately the structure of ozone was determined by using microwave spectrometers which can determine bond angles and bond distances of molecules very accurately. Using this method it was shown that the angle between two equal side arms is as large as 116°(1). 1. Solar UV Cut-off On the atmosphere, radiation from the Sun is incident copiously.

J oCt 260 0 24 ..... l 280 HUANCAYO 260 ot's. 9 A comparison of monthly ozone values in South America and Antarctic regions. Solomon et al. (18) showed from the balloon-sonde ozone data that ozone changes are largely confined in the region from about 10 to 20 km during August to October. 54 THE NEUTRAL UPPER ATMOSPHERE Stephenson et al. (19) examined depletion of stratospheric ozone caused by reaction of ozone with nitric oxide generated by energetic solar photons associated with solar flares.

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