MARINE FORECAST FOR SEAS IN A 25 MILE OR 40 KM RADIUS FROM SAINT LUCIA Weather: Partly cloudy with a few showers at first, becoming occasionally cloudy with scattered showers which may be heavy at times and possibly isolated thunderstorms from late afternoon into tomorrow. Winds will be blowing from the east near 21 mph or 33 km/h. Sunset today: 6:33 pm Sunrise tomorrow: 5:47 amįORECAST FOR SAINT LUCIA VALID FOR THE NEXT 24 HOURS Total rainfall for the month of July so far: Rainfall in the 24-hour period that ended at 2:00 am today: Wind at Hewanorra Airport is blowing from the east at 20 mph or 31 km/h. Last night’s minimum temperature at Hewanorra Airport was 27☌ or 81☏. Present temperature at Hewanorra Airport is 28☌ or 82☏. The excited electrons eventually calm down and release light, which is what we see as the aurora.Present weather at Hewanorra Airport is partly cloudy. When the electrons reach Earth's thin upper atmosphere, they collide with nitrogen and oxygen molecules, sending them into an excited state. If they were moving with the right speed relative to the wave, they would get picked up and accelerated." "In order to surf, you need to paddle up to the right speed for an ocean wave to pick you up and accelerate you, and we found that electrons were surfing. "Think about surfing," Jim Schroeder, an assistant professor of physics at Wheaton College who has led research on the process. Sometimes electrons hitch a ride on these superfast Alfvén waves, reaching speeds as high as 45 million mph as they hurtle downward.
As those waves get closer to Earth, they move faster thanks to the planet's magnetic pull. The sun's activity is volatile, and in some cases, the disturbances are so strong they can pull the Earth's magnetic field away from our planet.īut, like a taut rubber band when it's released, the magnetic field snaps back, and the force of that recoil creates powerful ripples known as Alfvén waves about 80,000 miles from the ground. "CMEs typically take several days to arrive at Earth, but have been observed, for some of the most intense storms, to arrive in as short as 18 hours," NOAA's Space Weather Prediction Center says. A CME projects plasma and pieces of the sun's magnetic field into the atmosphere. "You really got to get higher levels of storming really to be visible in the U.S., but the G2 prediction has since been degraded down to G1 or less," Bill Murtagh, the program coordinator for the National Oceanic and Atmospheric Administration 's Space Weather Prediction Center, said Wednesday.ĭuring the storm, a coronal hole (the spots that appear black on the sun) prompts high winds, which in turn, trigger coronal mass ejections, or CMEs. A G1 storm has a Kp-index of 5, while a G5 storm has a Kp index of 9. Geomagnetic storms are classified G1 (minor) through G5 (extreme) on the Kp-index, or planetary index. "However, now that the forecast activity is less than three days in the future, we can see that the solar features that produced the prior activity have actually diminished over the last month," he said.
The features it observed on the sun typically last one to three months, which led to its initial report, Rod Boyce, a spokesperson for UAF's Geophysical Institute, said Wednesday. The university now says the previous forecast derived from a long-term forecast based on the sun's rotation that went back 54 days. as previously thought.Ī previous forecast by the University of Alaska Fairbanks said the aurora would be visible in more than a dozen states. An updated forecast for this week's northern lights display shows they won't be as visible in the mainland U.S.
0 kommentar(er)
