Quiet solar units new document for spotless days
As of November 1st, the present stretch of days with none observable sunspots in photo voltaic cycle 24 has reached a complete of 228 spotless days in 2019 up to now That’s 75% of the yr up to now. Through the 2008 photo voltaic minimal, there have been 268 days with out sunspots, or 73% of the yr.
The solar as seen by the Photo voltaic Dynamics Observatory on Oct 31 2019
Right here’s a tally of spotless days for the final photo voltaic cycle:
2019 complete: 228 days (75%)
2018 complete: 221 days (61%)
2017 complete: 104 days (28%)
2016 complete: 32 days (9%)
2015 complete: zero days (zero%)
2014 complete: 1 day (<1%)
2013 complete: zero days (zero%)
2012 complete: zero days (zero%)
2011 complete: 2 days (<1%)
2010 complete: 51 days (14%)
2009 complete: 260 days (71%)
2008 complete: 268 days (73%)
2007 complete: 152 days (42%)
2006 complete: 70 days (19%)
In the meantime, a brand new cycle 25 sunspot was noticed at present. From Spaceweather.com :
Breaking a string of 28 spotless days, a brand new sunspot is rising within the solar’s southern hemisphere–and it’s a member of the following photo voltaic cycle. An image of the sunspot is inset on this magnetic map of the solar’s floor from NASA’s Photo voltaic Dynamics Observatory:
How do we all know this sunspot belongs to the following photo voltaic cycle? Its magnetic polarity tells us so. Southern sunspots from previous Photo voltaic Cycle 24 have a -/+ polarity. This sunspot is the other: +/-. In keeping with Hale’s Regulation, sunspots swap polarities from one photo voltaic cycle to the following. In the present day’s rising sunspot is subsequently a member of Photo voltaic Cycle 25.
This improvement doesn’t imply Photo voltaic Minimal is completed. Quite the opposite, low photo voltaic exercise will in all probability proceed for a minimum of one other yr as Photo voltaic Cycle 24 decays and Photo voltaic Cycle 25 slowly sputters to life. If forecasters are right, Photo voltaic Cycle 25 sunspots will ultimately dominate the photo voltaic disk, bringing a brand new Photo voltaic Most as early as 2023.
Again in April 2019, an confab of photo voltaic scientists stated:
Specialists Predict a Lengthy, Deep Photo voltaic Minimal
“We count on Photo voltaic Cycle 25 might be similar to Cycle 24: one other pretty weak most, preceded by an extended, deep minimal,” says panel co-chair Lisa Upton, a photo voltaic physicist with House Programs Analysis Corp.
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