Solar zenith angle and frequency dependence of ionosphericD-region absorption

  • S L Jain
  • R K Rai


In this paper, the results of a series of extensive measurements of multifrequency radio wave absorption in theD-region of the ionosphere during the epoch of the minium period of the solar cycle are presented. Experimental results for Udaipur, a low latitude station (24°35′N) are compared with the theoretically expected results. It is found that the experimental values of frequency indexm and cos χ indexn agree well with those obtained theoretically. The mean values ofm andn for the whole period of observation are found to be 1·76 and 1·4 respectively. The seasonal variation of the values ofm andn is also discussed.


Radiowave absorption solar cycle 


Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.


  1. Aikin A C, Goldberg G A, Somayajulu Y V and Avadhanulu M B 1972J. Atmos. Terr. Phys. 34 1483CrossRefGoogle Scholar
  2. CIRA 1965 COSPAR International Reference Atmosphere (Amsterdam: NH Publishing Co.)Google Scholar
  3. Jaeger J C 1947Proc. Phys. Soc. (London) 59 87CrossRefGoogle Scholar
  4. Jain S L 1973 Ph.D. Thesis, University of UdaipurGoogle Scholar
  5. Jain S L and Rai R K 1974J. Inst. Engrs. (India) 55 ETI 23Google Scholar
  6. Jain S L and Rai R K 1976J. Inst. Engrs. (India) 57 ETI 22Google Scholar
  7. Sen H K and Wyller A A 1960J. Geophys. Res. 65 3931CrossRefGoogle Scholar

Copyright information

© Indian Academy of Sciences 1979

Authors and Affiliations

  • S L Jain
    • 1
  • R K Rai
    • 1
  1. 1.Department of PhysicsUniversity of UdaipurUdaipur

Personalised recommendations