Affiliation
American Association of Variable Star Observers (AAVSO)
Thu, 12/17/2020 - 04:05
Hello,
I have been observing the sun for several years now.
I have just completed a training course on the classification of variable stars and light curves in French at AAVSO.
I am asking myself a very simple question without a precise answer, here it is:
- Regarding solar cycles, is there a convention established by the scientific community to determine the start of a new cycle? If yes, what are the criteria used?
Thank you in advance and have a good day,
Max Surlaroute
Hi Max,
There seems to be many theories on when and how the new solar cycle begins and ends. You may find some references here: https://ssnworkshop.fandom.com/wiki/Presentations_3
Rodney
Hi Rodney,
Thank you very much for these documents.
No doubt this will allow me to form an opinion and learn more.
Have a nice day,
Max Surlaroute
The SILSO September 15, 2020 News Release explains how they have determined that a new cycle has started. http://sidc.be/silso/node/167
Rich GRIB
Their criterion (SILSO) is "mathematical" .... change in growth .... variation in the slope of the tangent to the cycle curve ... null-positve-null-negative-null = one cycle ... .And so on !
Thank you Rich GRIB and have a good day,
Max Surlaroute