Dependence of seasonal variation of absorption on solar activity in the equatorial ionosphere |
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| Affiliation: | 1. National Remote Sensing Centre, Indian Space Research Organisation (ISRO), Department of Space, Hyderabad 500037, India;2. Department of Physics, Jawaharlal Nehru Technological University Hyderabad (JNTU-H), India 500085;3. Regional Remote Sensing Centre, NRSC, ISRO, Nagpur, India;4. Indian Institute of Soil and Water Conservation (IISWC), Research Centre, Ooty, The Nilgiris 643001, India and Presently at ICAR-IISWC, Research Centre,Koraput, Odisha-763 002, India.;5. Lab for Spatial Informatics (LSI), International Institute of Information Technology (IIIT), Hyderabad 500032, India;6. Research Institute for Global Change (RIGC), Japan Agency for Marine-Earth Science and Technology (JAMSTEC), Yokohama 2360001, Japan;1. Centre for Atmospheric Sciences, Indian Institute of Technology Delhi, New Delhi, India;2. Research Institute for Global Change, JAMSTEC, Yokohama, Japan;3. Space Applications Centre, Indian Space Research Organisation (ISRO), Ahmedabad, India;1. National Remote Sensing Centre (NRSC), Indian Space Research Organisation (ISRO), Department of Space, Hyderabad 500037, India;2. Lab for Spatial Informatics, International Institute of Information Technology (IIIT), Hyderabad 500084, India;3. International Center for Agricultural Research in the Dry Areas, Maadi, Egypt;4. Research Institute for Global Change (RIGC), Japan Agency for Marine-Earth Science and Technology (JAMSTEC), Yokohama 2360001, Japan |
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| Abstract: | From data for the absorption of radio waves at oblique incidence in Lagos, and at vertical incidence at Colombo, the seasonal variation of absorption at the two sites are examined. It is shown that, if subsolar absorption be assumed to depend upon sunspot number, the cos X law gives the same index for both the diurnal and the seasonal variation of absorption. |
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