The Aurora Borealis Might Be Visible in the Northern US Tonight
The colorful lights splashed across the night sky are caused by geomagnetic storms in our atmosphere and the SWPC pays attention to when these might occur. Geomagnetic storms in the atmosphere can arise from a cosmic phenomena called coronal mass ejections (CME). These surging ejections of solar wind come from the corona, the sun's outermost layer. CMEs consist of plasma and magnetic field, and they can take hours or days to reach Earth.
When CMEs arrive, they cause disturbances in our atmosphere by disrupting our planet's magnetic field. This creates geomagnetic storms. Coming sooner than expected, the first CME actually arrived earlier today, spaceweather.com reports.
As a result, a G1 (minor) geomagnetic storm is currently raging in our atmosphere. It's still too soon to tell if this is the first of two CMEs that erupted from the sun on Sunday, or if one CME "ate" the other one to make this a cannibal combination. Forecasters say the storm is strengthening into a G3-class.
Most places in the US won't have an opportunity to see the aurora borealis, but people in US regions as far south as Iowa, Michigan, Oregon, Pennsylvania and Wyoming might get a chance to see the lights, according to Accuweather. However, clouds, rain and snow might make it hard to see.
For the best chance of seeing it, you'll need to have an unobstructed view of the northern horizon and be using long-exposure photography to capture images of the phenomenon.
The Northern Lights have certain times of year when they're more likely to be observed. You have the best chance of catching aurora borealis in March, April, September and October, as these are the months near the spring and autumn equinoxes, when the Earth's position to the sun is ideal for geomagnetic storms.
"The equinoxes are the transition points between which hemisphere is tilted toward the sun," Shannon Schmoll, director of the Abrams Planetarium, told CNET last month. "At this point, the Earth's magnetic field is at a more favorable angle, closer to perpendicular, that allows easier interaction of the charged solar particles with the Earth's magnetic field and atmosphere."
April is a good month for watching the Northern Lights because we're at Solar Maximum -- the period of the highest solar activity in the 11-year solar cycle.
"During this time, we expect to see more sunspots, and therefore there's a higher chance of high-impact space weather occurring on any given day," Elsayed Talaat, director of the Office of Space Weather Observations at the National Oceanic and Atmospheric Administration, said last October.
So, if you live in a place where the aurora borealis might be visible tonight, make sure to head away from city lights and check out the night sky to the north.
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