Use available evidence to effects of sunspot activity on the Earth’s power grid and satellite communications.

Question

use available evidence to effects of sunspot activity on the Earth’s power grid and satellite communications.

Answer 1

past history proves this. read the ARRL Handbook, VHF/UHF section.

EVERY radio amateur knows the effects of sunspots.

Answer 2

First show how sunspots affect solar flares, then you have  evidence how they indirectly affect the Earth:Solar flares also create a wide spectrum of radio noise; at VHF (and under unusual conditions at HF) this noise may interfere directly with a wanted signal. The frequency with which a radio operator experiences solar flare effects will vary with the approximately 11-year sunspot cycle; more effects occur during solar maximum (when flare occurrence is high) than during solar minimum (when flare occurrence is very low). A radio operator can experience great difficulty in transmitting or receiving signals during solar flares due to more noise and different propagation patterns.

Significant events

An extremely powerful flare was emitted toward Earth on 1 September 1859. It interrupted electrical telegraph service and caused visible Aurora Borealis as far south as Havana, Hawaii, and Rome with similar activity in the southern hemisphere.

The most powerful flare observed by satellite instrumentation began on 4 November 2003 at 19:29 UTC, and saturated instruments for 11 minutes. Region 486 has been estimated to have produced an X-ray flux of X28. Holographic and visual observations indicate significant activity continued on the far side of the Sun