Reverse Polarity Sunspots appear on the Sun – ending a 39 day stretch of spotless days

Dr. Tony Phillips writes:

A new solar cycle is coming. Today, two sunspots emerged on the solar disk. Their reversed magnetic polarity marks them as members of new Solar Cycle 25. This quickening of new-cycle solar activity suggests that the sun is not entering a new Maunder Minimum despite the recent scarcity of sunspots.

Today, for the first time, there are two new-cycle sunspots on the solar disk–one in each hemisphere. This map of solar magnetic fields from NASA’s Solar Dynamics Observatory shows their location:

We know these sunspots belong to the next solar cycle because of their magnetic polarity. Simply put, they are backwards. According to Hale’s Law, sunspot polarities flip-flop from one solar cycle to the next. During old Solar Cycle 24, we grew accustomed to sunspots in the sun’s southern hemisphere having a -/+ pattern. However, look at today’s southern sunspot:

From the SDO – Solar Dynamics Observatory – click to magnify

It is the opposite: +/-. This identifies it as a member of new Solar Cycle 25.

Likewise, today’s northern sunspot has a reversed polarity compared to northern spots from old Solar Cycle 24. It, too, therefore, belongs to Solar Cycle 25.

The sun is currently in Solar Minimum–the nadir of the 11-year sunspot cycle. It’s a deep Minimum, century-class according to sunspot counts. The scarcity of sunspots has been so remarkable that it has prompted discussion of a possible “extended Minimum” akin to the Maunder Minimum of the 17th century when sunspots were absent for decades. Such an event could have implications for terrestrial climate.

Today’s new-cycle sunspots (along with isolated new-cycle spots earlier this year) suggest that the solar cycle is, in fact, unfolding normally. A new Maunder Minimum does not appear to be in the offing. Forecasters expect Solar Cycle 25 to slowly gain strength in the years ahead and reach a peak in July 2025.

Full story and more at Spaceweather.com

via Watts Up With That?

https://ift.tt/37dqmFX

December 25, 2019 at 12:46AM

One thought on “Reverse Polarity Sunspots appear on the Sun – ending a 39 day stretch of spotless days”

Leave a reply to uwe.roland.gross Cancel reply