10 votes
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Does a geomagnetic storm visibly deflect a compass?

You can definitely see a large geomagnetic storm with a compass, if you have the timing to catch one and the patience to sit and stare for a few minutes. If you look at these minutely measurements ...
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  • 881
10 votes

How much water is the atmosphere losing to space?

It is not actual water what is lost to space, because in the high atmosphere water usually dissociate into other molecules or ions. The oxygen ion outflow is frequently assumed to be a proxy for the ...
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9 votes
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What? Northern lights are *not* simply caused by energetic charged particles from the sun?

Solar wind particles directly entering the Earth's magnetosphere are not responsible for the majority of bright auroral displays. As you have found, it is magnetic reconnection that accelerates ...
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9 votes
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Does Magnetic Deviation depend on altitude?

Technically yes, but practically, usually no. The magnetic field varies in three dimensions and the variations are not parallel to the Earth's surface. However, horizontal distances varies usually ...
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8 votes
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Laboratory simulation of the Earth's magnetic field

Magnetohydrodynamic experiments intended to create laboratory analogues for the Earth's magnetic field generally use molten sodium rather than nickel. You can read about the details of one such ...
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3 votes
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If the earth's core is made up of copper/other metals other than iron-nickel alloy, how our magnetosphere will be?

On a quick approach: Magnetism. The copper itself have a weak magnetism, so a copper core will not create a magnetosphere. Chek here or here. Gravity. The Iron density is 7.874 g/cm³ and the nickel ...
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3 votes
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Where are the magnetopheres weak points on Earth?

The region where the Earth's internal magnetic field is weakest is known as the South Atlantic Anomaly (SAA). In this region at Earth's surface, the field is approximately one third the strength of ...
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3 votes
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What causes aurorae?

When the solar wind is funneled into the Earth's magnetic poles, those particles excite the electrons of molecules in the atmosphere which then bumps those electrons up into another orbital. When the ...
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2 votes

Does the magnetic field really protect Earth from anything?

It seems your question was more like a thinking exercise rather than a question. I cannot answer your question with robust confidence in the current state of knowledge. The fact is, I have always ...
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2 votes
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Does the magnetic field really protect Earth from anything?

Dr. Robert Strangeway kindly shared with me the poster he presented at AGU fall meeting 2017, the one I cited in the question based in the abstract only. I've included below some of the key parts of ...
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2 votes

What is the meaning of integral of negative magnetic field (nT) over time?

Disturbance storm time index is a measure of the weakened horizontal component of Earth magnetic field during great magnetic disturbances. The depression is often flanked by peaks, that initiates and ...
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  • 5,896
2 votes

Databases of all Astronomical Geomagnetic storms data

Could you be specific in your question as to what data you need on storms? Do you just need dates when storms occurred, or global geomagnetic index activity levels, or ground magnetic field ...
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2 votes

Derivation of Geomagnetic field lines (after interaction with solar wind)

Short answer: Tsyganenko was not the first to attempt an observation based mathematical model, and older purely theoretical models also exist. The first mathematical magnetic field model was created ...
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1 vote
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Can living where magnets are abundant provide a mini-magnetoshere?

Near to the Earth's surface there are small variations in the Earth's magnetic field, but these don't play a role in providing the magnetosphere which protects the Earth from charged particles ...
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