9 votes
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Is the mechanism of solar flares on red dwarfs and brown dwarfs the same as that on the Sun?

Yes, the basic mechanism is thought to be the same on red dwarfs and at least the hotter brown dwarfs, but the details can be different. As you say, magnetic reconnection in the corona is the ...
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  • 118k
8 votes
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How does a Super-Massive Black Hole 'flare'?

The flare happens just outside the black hole. Matter which aproaches a black hole but not perfectly straight on doesn't fall into it immediately. It gets pulled around the black hole, just as a ...
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6 votes
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Does coronal mass ejection include radiation at optical wavelengths?

Coronal mass ejections consist of a very hot, but thin, plasma. Their very weak intrinsic emission would be dominated by ultraviolet and X-ray lines and bremsstrahlung continuum. There is very little ...
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6 votes
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Difference in creation of solar flares and CME?

The point of my comment was that the connection between CMEs and flares would make for a good 20 page research paper in a college course. The connections are still only understood at a kind of ...
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6 votes
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What forces expelled these huge clouds, then blocked further progress, yet allowed it to maintain its threads?

This was a coronal mass ejection. Those 1973 astronomers weren't looking at the picture correctly. They didn't have the tools at that time to look at the picture correctly. Coronal mass ejections (...
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6 votes

How likely is it that the Sun will destroy our electric society?

I should give credit here to @honeste_vivere, who pointed out to me today that there have been recent studies excited by some extremely large coronal mass ejections that were classed as "near misses" ...
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5 votes
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Would an ultra bright moon indicate that the world is ending?

I remember that well. I presume you're referring to an episode of "The Outer Limits," which was based on a short story by Larry Niven. Having looked into the idea back when I read the story in the ...
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4 votes
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Any new info about solar flares hitting the Moon added by the LADEE mission?

You'd probably be most interested in the results of the Lunar Dust EXperiment (LDEX). A 2015 paper states LDEX data show no evidence for an electrostaticallylofted dust component at densities ...
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4 votes

Can solar luminosity & activity be predicted?

All of these effects are related to the 11 year solar cycle. And while we know there are times when the sun is "active" versus "inactive" we aren't necessarily predicting exactly where sunspots or ...
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  • 1,453
4 votes
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How bad could we reasonably expect a solar flare to impact earth, and what can be done to mitigate the impact?

Space Weather is the field within heliophysics that tries to understand this Sun-Earth relationship. When a Solar Flare occurs multiple things may happen and how it interacts with the Earth and our ...
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  • 383
4 votes
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Can a planet's gravity rip out its moon's atmosphere?

It's probably rare that moons have atmospheres to begin with. Planets don't generate solar flares. Planets emit thermal radiation as a result of their heat and during formation and collision planets ...
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4 votes

Directionality of solar flares

First, I have provided some background on these phenomena at: https://astronomy.stackexchange.com/a/16786/13663 Solar flares and coronal mass ejections (CMEs) are not the same phenomena. I am aware ...
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4 votes
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Solar flare generate energetic protons. Where do the electrons go?

The solar wind, and more generally plasma in space is not charged on average; it is electrically neutral. That means you have the positively charged ions and the corresponding amount of electrons. In ...
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3 votes
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Any active solar X-ray imager in orbit?

The Hinode satellite has an active x-ray telescope that is routinely used to image the sun. And the NuSTAR extreme x-ray telescope can also be used for sun imaging (although its main job is looking ...
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3 votes
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Does Earth's magnetic field become stronger when a solar flare hits?

No, but the magnetic dipole of Earth has a field strength that increases with closer distance. On the direct line between Earth and Sun the magnetic field strength is always $B(r) = M/r^3$ where $M$ ...
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3 votes
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Is it possible for a solar flare in one star to influence the chances of a solar flare in another star?

I'd say it's an open question awaiting some observational evidence that it can happen. It presumably would depend a lot on what kind of situation you are looking for, and what would you call a flare ...
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3 votes
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What triggers solar flares?

Magnetic fields are generated by currents - i.e. by the motion of charged particles. As you say, the Sun is full of freely moving charged particles, and these generate currents which in turn generate ...
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3 votes

Typical wavelength of solar flare

Solar flares are observed at wavelengths right across the electromagnetic spectrum, not just H alpha. The basic model for a solar flare starts with the magnetic field in the corona. You can think of ...
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3 votes

How bad could we reasonably expect a solar flare to impact earth, and what can be done to mitigate the impact?

It would be good business for the news industry: sky lights, plane crashes, exploding grid transformers, city blackouts, satellite damage, long, electricity-carrying wires would spark, start fires and ...
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3 votes

Spectra of electromagnetic radiation emitted during solar flare

Flares involve releasing huge amounts of potential energy that are stored in stressed magnetic structures in the solar corona. So-called reconnection events can release this stress but at the same ...
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3 votes

What is the largest recorded solar flare?

What is the largest recorded solar flare? Since @Moriarty already dealt with historical records, I will focus on the modern observations. X-Ray Classification On April 2, 2001 the GOES spacecraft ...
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3 votes

What are the main differences between solar flares and coronal mass ejections?

The following are largely excerpts from an answer I wrote at https://physics.stackexchange.com/a/258093/59023. What are the main differences between solar flares and coronal mass ejections? There ...
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3 votes
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What online tools are available to investigate and classify solar eruptions?

How are these flares tracked after they've been detected? Since you already linked to https://astronomy.stackexchange.com/a/16786/13663, I won't belabor the differences between a solar flare and ...
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3 votes

What would be the effect of a large solar flare on motor vehicles?

Never drive a car which is larger than a football field during a solar storm Otherwise, don't worry about it. The answer to Does a geomagnetic storm visibly deflect a compass? shows the plot below ...
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2 votes
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How does solar activity (e.g. flares, coronal mass ejections) change over the life cycle of a Sun-like star?

Magnetic activity depends on rotation due to the dynamo mechanism. Younger stars in general rotate faster. They (stars like the sun) spin down because their ionised winds interact with their magnetic ...
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2 votes
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Conditions on Hot Jupiters

I think we can broadly distinguish two classes of effects here: Flares directly affecting the planet The by-products of the flare affecting the planet I can loosely tell you what I know (although my ...
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2 votes

How bad could we reasonably expect a solar flare to impact earth, and what can be done to mitigate the impact?

Satellites have been damaged before. GPS has been effected before. Power grids surge during magnetic disturbances. Pipelines energize too. March 13 1989 was a whopper. There's a lot of reporting ...
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2 votes

Can hot Jupiters cause solar flares?

Sun is more than one thousand times the mass of Jupiter, so it seems unlikely that even a very close approach by a "hot Jupiter" to its host star would cause a flare, and especially not a superflare.
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2 votes
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Can hot Jupiters cause solar flares?

Just going off the Wikipedia article you posted, it says the hot jupiter superflare theory was abandoned. The flares were initially explained by postulating giant planets in very close orbits, ...
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2 votes

Detecting anomalies from the sun from home

The most extreme solar flares are visible as bright marks on the face of the sun and the most extreme CME are apparent as aurorae even at low latitudes. Detecting CME as they leave the sun is ...
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