If geomagnetic storm strong enough, aurora borealis may show over Northwest – The News Tribune

Tom MarkLast Update : Sunday 16 July 2017 - 1:27 AM
If geomagnetic storm strong enough, aurora borealis may show over Northwest – The News Tribune

Hopeful sky gazers could get the rare chance to spot the aurora borealis this weekend, but it’s going to depend on how strong a geomagnetic storm hits near earth.

The National Weather Service and National Oceanic and Atmospheric Administration issued a geomagnetic storm watch for Sunday and Monday.

Here’s what that means and how that happens:

On Friday a huge sunspot erupted on the surface of our sun, and an enormous solar flare — which is an explosion — ejected from the area. This explosion produced what scientists call a coronal mass ejection (CME).

A CME is a burst of magnetized plasma that interacts with the earth’s magnetic field to produce geomagnetic storms and an enhanced aurora around the north and south poles.

So when this energy arrives near earth on Sunday, it could spark a geomagnetic storm and brilliant auroras at far northerly latitudes.

If the storm is strong enough, Washington could be in for a show. KIRO 7 meteorologist Morgan Palmer cautions we won’t know for sure until late Sunday evening. The energy levels tend to fluctuate wildly during a geomagnetic storm, affecting how far south the Northern Lights are visible.

The aurora borealis — the “Northern Lights” — is a region of charged gases in the ionosphere, a region around 50 miles above the earth’s surface. These gases give off light from green to orange to red depending on the type of gas being excited by the charged solar particles.

Viewing tips from KIRO 7 meteorologist Morgan Palmer

Peak viewing time will be from around midnight to 3 a.m., but aurora can potentially be seen through most of the overnight hours.

CLICK THIS LINK for the latest 30-minute “forecast” for auroral activity, paying special attention to how far south the red “view line” extends. (Timestamps on the image are in Universal time, seven hours ahead of Pacific Daylight Time.)

If the auroral forecast predicts a visible aurora, get away from light pollution in urban areas and away from any bright lights. The darker your sky, the better.

Look north on the horizon. You may see a faint glow or much more. Remember, how vibrant a display will be is highly unpredictable.

Source: world

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2017-07-16 2017-07-16
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Tom Mark