Solar Cycle Update – spotless

Watts Up With That?

So Constant And Unspotted Didst Thou Seem1

Guest essay by David Archibald

The image of the Sun today is spotless.

latest_512_HMIIC (1)

This is the first spotless day of the 24-25 solar minimum. Not a great deal can be read from that. According to Wilson, for cycles 9-14, sunspot minimum followed the first spotless day by about 72 months, having a range of 62-82 months; for cycles 15-21, sunspot minimum followed the first spotless day by about 35 months, having a range of 27-40 months. So we could still be six years from minimum making Solar Cycle 24 about 13 years long. Longer is weaker in the following cycle, and colder.

When the Sun goes blank we still have what the professionals use – the F10.7 flux:

clip_image002

Figure 1: F10.7 Flux 2014 – 2016

Figure 1 shows that the F10.7 flux has been in a couple of parallel downtrends since early 2015…

View original post 257 more words

Advertisements

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s