SLIGHT CHANCE OF STORMS TODAY: NOAA forecasters say there is a 25% chance of G1-class geomagnetic storms on June 26th as Earth passes through a minor stream of solar wind. High-latitude sky watchers should be alert for auroras, especially in the southern hemisphere where winter darkness favors visibility. Free: Aurora Alerts
NEW ATMOSPHERIC RADIATION RESULTS: For the past two+ years, Spaceweather.com and the students of Earth to Sky Calculus have been monitoring cosmic rays in the atmosphere above California using high-altitude space weather balloons. After more than 100 flights, they find that dose rates have increased over the Golden State by 13% since March 2015.
Now we know the same thing is happening over New England--only more so.
The Earth to Sky team has flown balloons over Maine and New Hampshire four times since 2015, most recently on June 15, 2017. Although the data are relatively sparse compared to the better-sampled west coast, the results are clear. Radiation in the stratosphere over the northeastern corner of the USA is not only stronger than California, but also intensifying much faster--a 19% increase in New England vs. 13% in California.
What's happening? Generally speaking, cosmic rays are increasing throughout the entire solar system. This is because of the sunspot cycle. The sun is currently plunging toward a deep Solar Minimum. As it descends, the sun's weakening magnetic field and flagging solar wind provides less and less shielding against high-energy particles from deep space. Every planet in the Solar System is getting an extra dose.
The difference we see between California and New England is telling us something local about Earth. After the sun's magnetosphere deflects many cosmic rays, Earth's magnetic field and atmosphere provide another line of defense. Our data show that central California is better defended by geomagnetism than New England.
Cosmic rays penetrate commercial airlines, dosing passengers and flight crews enough that pilots are classified as occupational radiation workers. Some research shows that cosmic rays can seed clouds and trigger lightning, potentially altering weather and climate. Furthermore, there are studies ( #1, #2, #3, #4) linking cosmic rays with cardiac arrhythmias in the general population.
SIERRA SNOWPACK AS SEEN FROM THE STRATOSPHERE: A space weather balloon launched by Earth to Sky Calculus on June 23rd has captured remarkable spherical images of California's historic snowpack from the stratosphere. They show Sierra Nevada mountains laden with widespread snow despite an early summer heat wave that has sent temperatures shooting above 110 F at the base of the range. Click on the image to explore an interactive 360-degree scene:
This is the same camera we will use to photograph the Moon's shadow from the stratosphere during the Great American Solar Eclipse on Aug. 21. 2017. Stay tuned for more information about our Solar Eclipse Balloon Network in the days ahead.
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AURORA SURPRISE: A minor solar wind stream brushed against Earth's magnetic field on June 25th. Forecasters didn't expect much--but we were wrong. A beautiful display of auroras appeared near Bassano, Alberta:
"It was a bit of a surprise," says photographer Alan Dyer. "I positioned myself at the south shore of this prairie lake to shoot what I hoped was going to be a good display of noctilucent clouds over the water. I got a nice aurora instead!"
Realtime Space Weather Photo Gallery