Published April 13, 2013
A solar flare that occurred around 2 a.m. Thursday morning may create a spectacular display of northern lights Saturday evening. The midlevel flare had a long duration and was directed at Earth. According to AccuWeather.com Astronomer Hunter Outten, who stated that this flare was "impressive", these are the best conditions for seeing a direct effect on our planet. On the Kp index, the flare has been categorized at 6 to 8. This is a scale for measuring the intensity of a a geomagnetic storm. The 6 to 8 rating means that the effects of the radiation will have a greater reach.
The radiation from such a flare may cause radio wave disturbances to electronics such as cell phones, GPS and radios, causing services to occasionally cut in and out. While traveling slower than was originally anticipated, the flare effects are moving towards Earth at 1000 km per second.
The flare is also expected to cause vibrant northern lights from the Arctic as far south as New York, the Dakotas, Washington and Michigan, with a smaller possibility of it going into Pennsylvania and Iowa, even Kansas. The lights are currently estimated for 8 p.m. EDT Saturday arrival, with a possible deviation of up to seven hours. If the radiation hits much after dark settles on the East Coast the lights may be missed and will instead only be visible for the West.
Solar flares create auroras when radiation from the sun reaches Earth and interacts with charged protons in our atmosphere. The effects are greater at the magnetic poles and weaken as they move south from the Arctic or north of the Antarctic. In the northern hemisphere the results are called the aurora borealis, with the aurora australis being its southern counterpart. The result is a spectacular display of light and color for areas with clear enough views.
Viewing conditions will be best in the mid-Atlantic, specifically for parts of Pennsylvania and the Delmarva. Most of the country will have poor to fair views as a result of cloud cover, with areas further south not experiencing the aurora at all. A pocket of fair conditions sits over southeastern Oregon and the southwest corner of Idaho. A swath of partly cloudy conditions will also spread over a section of the Ohio Valley for parts of Michigan, Indiana and Illinois. Ohio will experience fair to good viewing conditions. For the rest of the country conditions will be poor.
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