Solar Cycle Nearing Minimum

Updated April 27, 2018:

Has anyone noticed anything different about the Sun? Anything unusual? Well, there’s nothing different, nothing unusual. The Sun is just going through its normal cycle. So, if you’ve looked lately, you’ve probably noticed that Sunspots are becoming rarer. The Sun goes through cycles. These cycles are measured by the number of Sunspots seen on the Sun’s surface, that is, the Earth-facing side. Each cycle lasts for about 11 years, with slight variations of time in each cycle.

The solar cycle was discovered in 1843 by Samuel Heinrich Schwabe, and using other observations, reconstructed the cycle back to 1745. Prior cycles were reconstructed from observations going back as far as Galileo and others in the early 1600’s. We are presently in cycle 24.  Right now, the Sunspot number is decreasing, and it has been for some time. Let’s look at the numbers.

Cycle 24 peaked in April, 2014 with 101 Sunspots, the weakest in a hundred years. There was only 1 day in 2014 with no Sunspots. 2015 had 0 spotless days. 2016 had 32 spotless days. 2017 had 104 spotless day. As of May 11 of 2018, there have been 73 spotless days this year, yielding a yearly percentage of 56% so far. The last “spotless” days stretch, ending May 5, was 6 days. The minimum is expected to “peak” in 2019-2020.

But even with this minimum, there is still activity to be observed. There are still the occasional flares and CME’s (Coronal Mass Ejections). And then there are the “holes” in the Sun’s atmosphere that let stronger than normal streams of solar wind, charged particles, target the Earth’s atmosphere and produce those awesome auroras in the high latitudes. So if you have a solar telescope, keep watching, it’s not hopeless.

Keep checking back, we’ll keep you updated weekly.