Skip to main content
14 votes
Accepted

How are the solar flares from May 23, 2021 extraordinary?

How are the solar flares from May 23, 2021 extraordinary? They weren't at all extraordinary. The Sun has been quiescent for the last three or so years. This quiescence is typical of the period ...
David Hammen's user avatar
  • 34.1k
9 votes

What caused a huge piece of the Sun to break off?

Not a CME, but pretty neat. This is a prominence, the plasma in the prominence got entrailed into a "vortex" that presumably exists at the solar pole. The wind speeds in the plasma are ...
James K's user avatar
  • 123k
7 votes

Where do Coronal Mass Ejections go?

Coronal Mass ejections are not easy to detect from Earth (until they hit the ionosphere and cause a geomagnetic storm) The first was discovered by a space-based solar observatory in 1971. They are, ...
James K's user avatar
  • 123k
6 votes
Accepted

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 ...
ProfRob's user avatar
  • 153k
6 votes
Accepted

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 ...
Ken G's user avatar
  • 5,336
5 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 ...
honeste_vivere's user avatar
4 votes
Accepted

Can CME destroy planetary rings?

Yes it can reach both Saturn and Jupiter. But it's not powerful enough to remove their rings. Even Earth's radiation belts don't get blown away. Edit: Jupiter's magnetic field is $\approx 770 \mu T$ (...
George's user avatar
  • 334
4 votes

how much advanced notice would we have for an Earth bound coronal mass ejection?

To supplement Rory Alsop's answer, it is also possible to detect some CMEs through X-ray observations of the Sun. We have a few satellites continually monitoring the Sun, and if we're lucky we'll see ...
John McCarthy's user avatar
4 votes
Accepted

how much advanced notice would we have for an Earth bound coronal mass ejection?

Could be as much as an hour. Looking at NASA's Space Weather Prediction Centre page on CMEs Imminent CME arrival is first observed by the Deep Space Climate Observatory (DSCOVR) satellite, located at ...
Rory Alsop's user avatar
  • 5,112
4 votes
Accepted

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 ...
honeste_vivere's user avatar
4 votes

Why do CME's "zig-zag" on their way to Earth?

Why do CME's “zig-zag” on their way to Earth? They don't. Coronal mass ejections (CMEs) do not jump back-and-forth as they propagate outward. Their general shape does get distorted due to mass ...
honeste_vivere's user avatar
3 votes

How are the solar flares from May 23, 2021 extraordinary?

Could somebody please guide me how this is read from the (above linked) NOAA forecast model graphs? The yellow dot is the sun, the green dot is the position of the Earth. The CME is the blob of high ...
hobbs's user avatar
  • 758
3 votes
Accepted

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 $M$ ...
AtmosphericPrisonEscape's user avatar
3 votes

Calibrating raw photometric measurements

I have never worked with SMEI but I do have some experience with photometry and, while I do not understand completely the question, I think I can give you some ideas. First of all, did you get the ...
Solfreludio's user avatar
3 votes
Accepted

Calibrating raw photometric measurements

If I understand the question correctly, you have raw data from a CCD sensor in arbitray units (which correlate with brightness) and your challenge is to callibrate this intensity for a certain ...
B--rian's user avatar
  • 5,616
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 ...
honeste_vivere's user avatar
3 votes

how accurate are the predictions for coronal mass ejections-(location, timing and magnitude)?

Old question; I hope you’re still active here… Basically, we CAN’T predict coronal mass ejections in advance. See http://solar.physics.montana.edu/press/ssu_index.html Other solar events, such as the ...
Pierre Paquette's user avatar
2 votes

Might someone see changes to the corona during a solar eclipse?

Yes. There is a chance of one or more solar flares or CME's occurring during the eclipse and these would be noticeable during totality. There are actually two NASA jets equipped with telescopes and ...
Natsfan's user avatar
  • 4,494
2 votes

How was the acceleration calculated for this CME (Coronal Mass Ejection)?

The average velocity in the interval 8:05 to 8:36 is 331.2. So, use $v_1=$ 331.2 at $t_1=$ 08:20:30 under the assumption that acceleration is constant. The average velocity between 8:36 and 9:27 is $...
ProfRob's user avatar
  • 153k
2 votes

How are the solar flares from May 23, 2021 extraordinary?

According to NOAA's Space Weather Prediction Center there was a Solar radio burst at 245 MHz at ~21:30 UTC that was 3300 flux units above background (1 flux unit $= {\rm 10^{-22} Wm^{-2} Hz^{-1}}$) on ...
franz_lyre's user avatar
2 votes

What is the lower limit of a coronal mass ejection?

No, as ‘coronal mass ejection’ is defined ambiguously and refers to an event that is not physically bound to some exact limit and therefore cannot have an undisputable lowest limit value, in the ...
M. Y. Zuo's user avatar
  • 171
2 votes

Physical properties of the stellar corona?

...how typical is the solar corona? The Sun is remarkably "average" (e.g., see https://physics.stackexchange.com/a/262732/59023). So my best guess is that the corona is also remarkably &...
honeste_vivere's user avatar
2 votes

Could a sheet of plasma ejected from the sun's surface magnetically reconnect with itself and eject bits of itself which then also reconnect?

Could the Corona of the sun be getting heated by large sheets of plasma ejecting smaller sheets and these in turn ejecting smaller sheets? I will rephrase the question to: Could magnetic ...
honeste_vivere's user avatar
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 ...
James K's user avatar
  • 123k
2 votes

Strength of the relationship between very large solar flares, coronal mass ejections, and solar proton events?

First, have you looked through my answer at: https://astronomy.stackexchange.com/a/16786/13663? First, is my understanding that either a large flare or a large CME could have caused a large solar ...
honeste_vivere's user avatar
1 vote

Directionality of solar flares

I have just found this paper which seems very relevant: https://www.sciencedirect.com/science/article/abs/pii/S1350448799000633?via%3Dihub "Particles arising at some remote location from the sun ...
Slarty's user avatar
  • 359
1 vote
Accepted

What would be the effects of a -400 nanotesla geomagnetic storm on modern electronics?

You basically asked the same question over on Worldbuilding. I'm copying my answer to that question here. This answer does not specifically address the strength of the magnetic pulse because whether ...
JBH's user avatar
  • 550
1 vote

What effects do CMEs have on planets like Mercury?

Much like Earth, Mercury also has a magnetic field, only much weaker. Because of this, the high velocity charged particles accompanying CMEs distort Mercury's magnetic field at a much greater ...
jrima12's user avatar
  • 111
1 vote

Solar flares/CME dangers to life?

I would say, that with our current atmosphere and magnetic field there's not a "direct" threat to life as they shield the Earth. The atmosphere is opaque to X-ray radiation that can come ...
dvdgc13's user avatar
  • 393

Only top scored, non community-wiki answers of a minimum length are eligible