How long is the time period from an eruption of a solar flare to the beginning of electronic interference-

Question

in the atmosphere on Earth?

Answer 1

8 minutes...

Its the period of time required for light from sun to reach earth.

Answer 2

8.3 minutes.

Answer 3

It depends on the strength of the flare itself, some are bigger than others. From the time they're detected on Earth (approx. 8 minutes after they occur) it can take 2 or more hours to reach Earth. At least that's what was thought before. On January 20, 2005, a solar flare launched a large amount of protons that arrived on Earth only 15 minutes after detection, meaning they got here in 23 minutes, at nearly one-third the speed of light! Their strength depends on the degree to which the Sun's magnetic field is entangled where it originates.

EDIT: as hog b kindly pointed out, geomagnetic storms are not only caused by electromagnetic radiation; in fact, I don't think they have anything to do with it (not sure). These storms are caused by the solar winds (created by solar flares, CME's, etc.), which are basically a plasma composed of highly energized protons and electrons. They excite the elements in Earth's upper atmosphere (causes the Aurora Borealis, aka Northern Lights) and disturb the Earth's magnetosphere, which is what causes blackouts and electronic interference (remember that moving magnetic fields create electricity; that's how all power generators work). There's really no one amount of time that they all take, some can be quick as I pointed out earlier, others can take over 24 hours to reach us.

Answer 4

The electromagnetic radiation takes place after 8.3minutes.But the charged particles that cause the problems travels at 400 kilkometers  per second.It may take 2 or 3 days to reach the earth.

Answer 5

About 8 min...

Answer 6

As Sval points out, it is not primarily the electromagnetic waves that interfer most,(which arrive at the speed of light in 8 and a bit minutes) it is subatomic particles, particularly protons, which arrive later, Sval has some good figures for that.