Time-variation of solar influence on tropospheric circulation

Arora, B. R. ; Padgaonkar, A. D. (1981) Time-variation of solar influence on tropospheric circulation Journal of Atmospheric and Terrestrial Physics, 43 (2). pp. 91-95. ISSN 0021-9169

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Official URL: http://linkinghub.elsevier.com/retrieve/pii/002191...

Related URL: http://dx.doi.org/10.1016/0021-9169(81)90066-0


The influence of large geomagnetic disturbances and solar magnetic sector structure on Vorticity Area Index (VAI) at 500 mb is studied by subdividing the data of 1946-1978 into 15 blocks, each of five years with three years overlapping in successive blocks. Results clearly show marked time-variation in the amplitude of solar-induced signal in VAI in association with the sector boundary passage as well as with large geomagnetic disturbances. These time-variations bear a close parallelism with those of the absolute value of VAI. It is inferred that the initial intrinsic state of the atmosphere is an important factor in controlling the ensuing sun-weather effect. If the variation of VAI with time is taken into account, varying effects reported by earlier workers can be fairly explained.

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