Northern Lights Now – It has been such a treat attending the Space Weather Workshop in Boulder Colorado. It is exciting to watch the ideas and collaboration arise as this wonderful community of academic, government, commercial, and enthusiast space weather stakeholders collaborate.
As I’ve been talking with people and explaining NLN, I’ve realized that I need to have a simple central place to access some of the more scicom-ready data visualizations, stories, videos, and just plain cool examples as a jumping off point. This blog entry is that.
Your best bet for determining if there is currently aurora activity is to take a peak at the current KP value. The chart on that page shows the current KP and the expected KP over the next 30-75 minutes. KP is a global scale that ranges from 0 to 9, the higher the value, the more active the aurora is and the closer to the equator it may be visible.
Once you know the current KP, you will want to know if it is possible to see aurora where you are at that KP. This map helps with that:
Find your location on this map, If you are in the Northern Hemisphere the KP level you need is the line to the south of your location. Likewise, if you are in the southern hemisphere the value you need is on the line to the north of your location.
Finally, check your weather. Aurora displays are high in the atmosphere. If it is cloudy, the aurora will be above the clouds and you will not be able to see them.
Great question! We hear it often. The answer needs to be more than 140 characters.
The short answer is yes. There are a number of reasons Norway, Sweeden and Finland are terrific travel location for aurora hunters. But surprisingly, this has nothing to do with there aurora activity in October – it comes down to it being the right balance of warm (or at least not insanely cold) and dark.
The longer answer:
Solar storms arrive at Earth in a pattern governed by activity cycles on the Sun which are completely independent of the position of Earth or the season on Earth. Solar storms and aurora are just as likely to happen in October as in any other month.
The solar cycle can be used for determining how likely it is that your visit to a higher latitude location will coincide with an aurora show. This 11-year cycle governs the number of active regions and sunspots on the sun. Generally speaking, when there are more sunspots, solar storms from flares are more likely and aurora are more likely. So, a trip to Scandinavia during the peak of the solar cycle is more likely to reward an aurora hunter. The current solar cycle, “cycle 24”, is now in it’s declining phase, but there are still plenty of nights with aurora in store over the next several years. Here’s a graph showing the progress of the current solar cycle:
Because a solar storm can arrive any time of the year, and at any time of day, the best place to be is where it is dark for a larger percent of the day. In the northern hemisphere, this means September through March, in the southern hemisphere March through September are the best aurora hunting months.
It also has to be clear to see the aurora because they are above the clouds. So, once you’ve picked a place to visit, choose a time of year where it is more likely to be clear skies.
In Vermont, where NLN is based, we frequently hear that August is the best time of year for northern lights – which goes entirely counter to the previous paragraphs. This discrepancy is due to weather. In August is it summer, its is warm and people are camping. People spend more time outside at night, and see more aurora. In the winter it’s cold and people huddle by their fireplaces at night, so they don’t even notice the aurora going on just outside their door. This leads to a perception that summer is a better time of year to see aurora.
Autumn seems to be the most comfortable and rewarding time of year to hunt aurora. The nights get longer, and the temperature hasn’t dropped too much yet.
So yes – go visit Scandinavia during October. Even if you don’t see the lights, it’s a wonderful place to visit.