Abstract
Solar wind velocity control of low latitude geomagnetic field both on long and short term basis is studied. It is shown that semiannual averages of the low latitude field is inversely related to solar wind velocity and that there is a dominant local time dependence of the relationship. Strongest correlation are confined to the local afternoon hours. It is also shown that for a duration when the solar wind velocity exhibits significant recurrent pattern the low latitude geomagnetic field also depicts strong solar synodic rotation periodicity of 27 days with significant coherence with velocity. The low latitude field on a short term basis is influenced by variable solar wind velocity with a delay of about 1–2 days. During the period of systematic recurrent pattern in solar wind velocity even the quiet-time night field at equatorial and low latitudes show a strong dependence on velocity indicative of the solar wind control of the quiet-time proton belt encompassing the earth.
Similar content being viewed by others
References
Bhargava B N 1973J. Atmos. Terr. Phys. 35 567
Bobrov M S 1975Planet. Space Sci. 23 627
Burlaga L F 1975Space Sci. Rev. 17 327
Burton R K, McPherron R L and Russell C T 1975J. Geophys. Res. 80 4204
Crooker N U, Feynman J and Gosling J T 1977J. Geophys. Res. 82 1933
Davis L R and Williamson J M 1963Space Res III (Amsterdam: North Holland) 365
Frank L A 1967J. Geophys. Res. 72 1905
Gallaher D L and D’Angelo N 1981Geophys. Res. Lett. 8 1087
Garrett H B, Dessler A J and Hill T W 1974J. Geophys. Res. 79 4603
Gosling J T and Hansen R T 1971J. Geophys. Res. 76 1811
Hoffman R A and Bracken P A 1965J. Geophys. Res. 70 3541
Intrilligator D 1977Study of travelling interplanetary phenomena (Holland: Reidel) 195
Maezawa K 1978Qualitative modelling of magnetospheric processes geophysical monographs AGU 436
Murayama T and Hakamada K 1975Planet Space. Sci. 23 75
Olbert S 1968Physics of the magnetosphere (Holland: Reidel) 641
Rangarajan G K 1981Proc. Indian Acad. Sci. (Earth Planet. Sci.) 90 55
Schield M A 1969J. Geophys. Res. 74 1275
Snyder C W, Neugebauer M and Rao U R 1963J. Geophys. Res. 68 6361
Yacob A and Bhargava B N 1971J. Atmos. Terr. Phys. 33 515
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Rangarajan, G.K. Long and short term relationships between solar wind velocity and geomagnetic field at low latitudes. Proc. Indian Acad. Sci. (Earth Planet Sci.) 93, 343–351 (1984). https://doi.org/10.1007/BF02843252
Received:
Revised:
Issue Date:
DOI: https://doi.org/10.1007/BF02843252