291
you are viewing a single comment's thread
view the rest of the comments
view the rest of the comments
this post was submitted on 29 Nov 2023
291 points (96.5% liked)
World News
39395 readers
2415 users here now
A community for discussing events around the World
Rules:
-
Rule 1: posts have the following requirements:
- Post news articles only
- Video links are NOT articles and will be removed.
- Title must match the article headline
- Not United States Internal News
- Recent (Past 30 Days)
- Screenshots/links to other social media sites (Twitter/X/Facebook/Youtube/reddit, etc.) are explicitly forbidden, as are link shorteners.
-
Rule 2: Do not copy the entire article into your post. The key points in 1-2 paragraphs is allowed (even encouraged!), but large segments of articles posted in the body will result in the post being removed. If you have to stop and think "Is this fair use?", it probably isn't. Archive links, especially the ones created on link submission, are absolutely allowed but those that avoid paywalls are not.
-
Rule 3: Opinions articles, or Articles based on misinformation/propaganda may be removed. Sources that have a Low or Very Low factual reporting rating or MBFC Credibility Rating may be removed.
-
Rule 4: Posts or comments that are homophobic, transphobic, racist, sexist, anti-religious, or ableist will be removed. “Ironic” prejudice is just prejudiced.
-
Posts and comments must abide by the lemmy.world terms of service UPDATED AS OF 10/19
-
Rule 5: Keep it civil. It's OK to say the subject of an article is behaving like a (pejorative, pejorative). It's NOT OK to say another USER is (pejorative). Strong language is fine, just not directed at other members. Engage in good-faith and with respect! This includes accusing another user of being a bot or paid actor. Trolling is uncivil and is grounds for removal and/or a community ban.
Similarly, if you see posts along these lines, do not engage. Report them, block them, and live a happier life than they do. We see too many slapfights that boil down to "Mom! He's bugging me!" and "I'm not touching you!" Going forward, slapfights will result in removed comments and temp bans to cool off.
-
Rule 6: Memes, spam, other low effort posting, reposts, misinformation, advocating violence, off-topic, trolling, offensive, regarding the moderators or meta in content may be removed at any time.
-
Rule 7: We didn't USED to need a rule about how many posts one could make in a day, then someone posted NINETEEN articles in a single day. Not comments, FULL ARTICLES. If you're posting more than say, 10 or so, consider going outside and touching grass. We reserve the right to limit over-posting so a single user does not dominate the front page.
We ask that the users report any comment or post that violate the rules, to use critical thinking when reading, posting or commenting. Users that post off-topic spam, advocate violence, have multiple comments or posts removed, weaponize reports or violate the code of conduct will be banned.
All posts and comments will be reviewed on a case-by-case basis. This means that some content that violates the rules may be allowed, while other content that does not violate the rules may be removed. The moderators retain the right to remove any content and ban users.
Lemmy World Partners
News !news@lemmy.world
Politics !politics@lemmy.world
World Politics !globalpolitics@lemmy.world
Recommendations
For Firefox users, there is media bias / propaganda / fact check plugin.
https://addons.mozilla.org/en-US/firefox/addon/media-bias-fact-check/
- Consider including the article’s mediabiasfactcheck.com/ link
founded 2 years ago
MODERATORS
I hope someone can ELI5. I mean, we're told that sunlight/etc we see is 8 minutes old - it took 8 minutes to get from the sun to the earth. The radiation, light, etc all travel at the speed of light, neither slower nor faster.
If we can see anything on the sun, it happened 8 minutes ago. It's not like we're looking out over a Kansas field and see a tornado coming.
Further, there's this from a quick Google (while attempting to answer this question myself), from Oct 13 2023:
"How much warning do we have for solar storms? So it should come as no surprise that a team at NASA has been busily applying AI models to solar storm data to develop an early warning system that they think could give the planet about 30 minutes' notice before a potentially devastating solar storm hits a particular area."
So how are we getting a notice one or two days in advance here? Is the sun currently ejecting matter into space, intersecting the place in our orbit we'll occupy tomorrow (or the next day)? Or is this like predicting a volcanic eruption, basing it on other observable behavior?
CMEs and solar flares do not travel at the speed of light, as they are not light
The charged particles that affect our electrical and electronic systems have mass and therefore cannot travel at the speed of light... We can see the visible light effects of a flare and know that the slower-moving particles that will cause actual damage are on the way.
That was a very succinct explanation; two sentence refresher course. Thank you!
I would surmise they're talking about a system to let us know where the worst effects are happening so people can prepare. This article says the fastest storms take 15-18 hours to arrive and most are slower. https://www.swpc.noaa.gov/phenomena/coronal-mass-ejections
Yes, it's not just light, it's better to understand it as an ejection of super heated plasma. It is mass ( actually called a coronal mass ejection ) and maybe kinda comparable in ELI5 concept to a volcano eruption.
So, the thing is we can't really predict CMEs. What we can do is observing them by satellites like SOHO or SDO (actually you can also check these data, check for jHelioViewer). While light indeed needs roughly 8 minutes to travel from the Sun, the ejected plasma is much slower than that, it travels at a comfy pace of 1000km/s or so. So it takes about a day to reach Earth (you can do the precise numbers as a homework or use Wolfram alpha to cheat), so from the observations we have roughly this time to do anything.
ChatGPT says:
This delay is due to the fact that solar storms consist of charged particles (mostly electrons and protons) ejected from the Sun. These particles are not electromagnetic radiation (like light), so they don’t travel at the speed of light. Instead, they are propelled by the solar wind, a continuous stream of charged particles that flows outward from the Sun.
The solar wind travels at varying speeds, but it typically takes several days for the charged particles associated with a solar storm to travel from the Sun to Earth. The exact time depends on the speed of the solar wind and the distance between the Sun and Earth.
So, although light from the Sun reaches us in just over eight minutes, the charged particles involved in solar storms take longer to traverse the vast distance of space between the Sun and Earth.
*downvoters be like “oh no, it answered the question successfully, how can I get triggered emotionally by this?!” Like seriously guys you realize it’s basically a calculator for language? what the fuck are you hating on?
Excellent! Thank you!
Can’t tell if you’re being serious….
there are satellites orbiting the Sun, much as how we have satellites orbiting the Earth to help predict our weather. same principle