I got informed that Earth and The Sun both have magnetic fields and THAT is an explanation for global warming. I guess there is such a thing as a degree in stupid, or possibly that this effect only started around 1900.
If someone doesn't think that I represent what they posted, what that clown posts doesn't represent science, so what?
If north is up north, then compass's north end is actually south.
The compass has a "north seeking end" but it has to be of south magnetic polarity.
But if you take the south end of a bar magnet and bring near a compass, the north end of the needle will be attracted. Shouldn't the "north seeking" end be repelled. So the compass north end of the compass is actually a north pole.
So technically using that example, up north has a south polarity.
You have to detect the direction of the field.
Tom...
PS. And I haven't has a coffee this morning, yet.
Reminds me of something my dad once told me: he was in the parts department of a car dealership he often went to buying parts for something when a guy came in wanting a bulb for the engine warning light on his car.
My dad: "what's the problem, won't it come on?"
The guy: "No, it won't go off".
Can happen as often as every 10 thousand years or so and as infrequently as every 50 million years or more . The last reversal was about 780,000 years ago.
The time it takes for Earth's magnetic field to reverse polarity is approximately 7000 years . . .
I know of 5 mass extinction events. But that's my limited knowledge so I looked around and found that the weakening of the magnetic field does let space weather in.
But then I guess it depends on what you call a mass extinction. The pole reversals have happened a lot more frequently than the big extinction events.
quote" Magnetic Pole ReversalsWhile that may sound like a big deal, pole reversals are common in Earth's geologic history. Paleomagnetic records tell us Earth's magnetic poles have reversed 183 times in the last 83 million years, and at least several hundred times in the past 160 million years."
The last reversal is identified as happening 42,000 or maybe 34,000 years ago and I know of no mass extinction corresponding to it and can't find any for what's that worth.
The thing is that mass extinction timelines don't tend to be as precise as to when they happened as pole reversals have happened so for the big 5 it's not hard to find a pole reversal within the range of each that may have been a factor. The hard part is tying an extinction to every pole reversal
Do any mass extinctions correlate with magnetic reversals?
No. There is no evidence of a correlation between mass extinctions and magnetic pole reversals.
Earth’s magnetic field and its atmosphere protect us from solar radiation. It’s not clear whether a weak magnetic field during a polarity transition would allow enough solar radiation to reach the Earth's surface that it would cause extinctions. But reversals happen rather frequently--every million years or so--compared to mass extinctions, which occur every hundred million years or so.
IMO, this is a nice start point for looking but note that it is not a new field of study and so far I'm pretty sure that humans have already wiped out more species than last time the poles flipped.