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**50kW**. we have to presume that radiation is equally distributed to upper surface. And i have to find amplitude of

**E**and

**B**

**100 km**from earth.

I derived equation that involves

**P**and

**E**.

**P**=

**E^2 * sigma0 * c**

But that

**P**is probably power of one wave. And to get power of one wave I thought it is logical to divide whole P with semisphere with radii of 100 km.

and after that calculated E and got 3*10^-5 V/m, but book has different answer, after getting E it is easy to calculate B because B = E/c. any suggestions?