## Abstract A multiβindex drought (MID) model was developed to combine the strengths of various drought indices for agricultural drought risk assessment on the Canadian prairies, as related to spring wheat crop yield. The model automatically selects and combines optimum drought indices derived from
On the crosscorrelation between drought indices and solar activity
β Scribed by G. Padmanabhan; A. Ramachandra Rao
- Publisher
- Springer
- Year
- 1990
- Tongue
- English
- Weight
- 519 KB
- Volume
- 41
- Category
- Article
- ISSN
- 1434-4483
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The cross-correlation coefficient 7(t) of the solar tidal force induced by the planets f(x -~-t) with the sunspot number g(x) during a period of 44 years is about --0.7 when t is about --2 years. This fact will be useful for predicting solar activity. The solar tidal force was calculated from 1928 t
In this paper, applying Vondrak band filter to both series of (1.o.d.) and sunspot relative number (R), we obtain variations of amplitude of 11 yr term during 1800-1985. The results show that solar cyclic signal in (1.o.d.) series is weak and unstable. The amplitude of 11 yr term in R series has lon