pure and applied geophysics

, Volume 98, Issue 1, pp 146–152 | Cite as

The sunspot cycle and solar and lunar daily variations inH

  • D. R. K. Rao


Results of sunspot cycle influence on solar and lunar ranges at a low latitude station, Alibag, outside the equatorial electrojet belt, show that the sunspot cycle association in solar ranges is three times that of the lunar ranges in thed- andj-seasons. This is in general agreement with the earlier results for non-polar latitude stations. The association with sunspot number of individual lunar amplitudes is greatest for lunar semidiurnal harmonic in thej-season. During this season, the sunspot cycle influence on lunar variations is more than that on solar variations, thereby indicating that the lunar current is situated at a level more favourable for sunspot cycle influence than the level of the current associated with solar variations. With the increase in solar activity a shift appears in the times of maxima of semidiurnal lunar variation towards a later lunar hour ine- andj-seasons and in the year.


Solar Activity Early Result Sunspot Number Daily Variation Sunspot Cycle 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.


  1. [1]
    S. Chapman, J. C. Gupta andS. R. C. Malin, Proc. Roy. Soc. Lond. A.324 (1971), 1Google Scholar
  2. [2]
    N. B. Trivedi andR. G. Rastogi, Indian J. Met. Geophys.20 (1969), 235.Google Scholar
  3. [3]
    S. Chapman andJ. C. P. Miller, Monthly Not. of R.A.S., Geophysical Supplement4 (1940), 649.Google Scholar
  4. [4]
    D. R. K. Rao, Pageoph (1971), in press.Google Scholar
  5. [5]
    S. R. C. Malin, Geophys. J. R. astr. Soc.13, (1967), 397.Google Scholar
  6. [6]
    S. Chapman, J. C. Gupta andS. R. C. Malin, Beitr. Geophys.79, (1970), 5.Google Scholar
  7. [7]
    B. R. Leaton, S. R. Malin andH. F. Finch, Royal Observatory Bulletins, No. 63 (1962).Google Scholar
  8. [8]
    P. Green andS. R. C. Malin, J. Atmosph. Terr. Phys.33, (1971), 305.Google Scholar
  9. [9]
    A. Yacob andD. Radha Krishna Rao, J. Atmosph. Terr. Phys.28 (1966), 351.Google Scholar

Copyright information

© Birkhäuser Verlag 1972

Authors and Affiliations

  • D. R. K. Rao
    • 1
  1. 1.Indian Institute of GeomagnetismColaba Observatory CompoundBombay-5India

Personalised recommendations