Possible radioindications of anthropogenic influences on the mesosphere and lower thermosphere |
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| Affiliation: | 1. Department of Astronomy and National Astronomical Observatory, Bulgarian Academy of Sciences, 72 Lenin Blvd., Sofia 1784, Bulgaria;2. Geophysical Institute, Bulgarian Academy of Sciences, Sofia 1113, Bulgaria;1. Physical Research Laboratory, Navrangpura, Ahmedabad 380009, India;2. Pandit Deendayal Energy University, Gandhinagar 382007, India;3. Space Physics Laboratory, VSSC, Trivandrum 695022, India;1. Space Physics Laboratory, Vikram Sarabhai Space Centre, Thiruvananthapuram 695022, India;2. Former Scientist, Space Physics Laboratory, Vikram Sarabhai Space Centre, Thiruvananthapuram 695022, India;1. National Atmospheric Research Laboratory (NARL), Gadanki, India;2. Department of Physics, Sri Venkateswara University, Tirupati, India;3. Research Institute for Sustainable Humanosphere, Kyoto University, Uji, Japan;4. B1, CEEBROS, 47/20, IIIrd Main Road, Chennai, India;5. EGRL, Indian Institute of Geomagnetism (IIG), Mumbai, India;6. Indian Institute of Geomagnetism (IIG), Mumbai, India;7. Space Physics Laboratory, VSSC, Thiruvananthapuram, India |
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| Abstract: | From an analysis of the variations of various ionospheric characteristics influenced by global anthropogenic effects, it is shown that the collision frequency ven is the parameter that changes most when the ratio between the carbon dioxide plus methane and the other components is changed. Since this collision frequency is directly involved in the formation of ionospheric absorption, the latter is recommended to be regarded as the most sensitive ground-based indicator of the global ‘cooling’ of the near-Earth space. Expressions are obtained for the estimation of man-made influences by absorption measurements. For medium latitudes, we recommend the frequency range from 400 to 800 kHz as a sensitive range for these measurements. |
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