How I find Annual and SemiAnnual variation in Data?

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uzma Ashraf Ali
uzma Ashraf Ali le 25 Déc 2019
I am Stuck at a point....
I am using EOF(Empirical Orthogonal Function) models ,using FoF2 frequency.
After applying model i got Base coefficients A1-A3 ,A1 define Pattern of Cyclic behaviour of Solar Flux ,A2 define Annual behaviour of Solar Flux depending factor of F2F2, A3 define Semi- Annual behaviour of Solar Flux depending factor of FoF2.
My Question is how I detect periodicity by Fourier in A2 and A3.
Kindly help me in this regards.

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