My name is Roger Tattersall and I am proud to have been invited by Ray Tomes to join this forum. My interest in cycles is primarily in studying the solar system and the relationship between it’s cyclic motions and cycles in Earth’s climate and other varying terrestrial phenomena such as the length of day.
My interest in the subject was sharpened when I read Ray’s thread on another forum concerning the link between planetary motion and the sunspot cycle. On that thread, Ray was assisted by some posts made by Vale Carl Smith, who had been studying the motion and angular momentum of the sun relative to the centre of mass of the solar system, or ‘barycentre’ (SSB). The solar motion relative to the SSB can be regarded as a proxy for the aggregate of planetary motions in the solar system.
Today is the first anniversary of Carl’s death and while his loss caused sadness for all who knew him when he lost his battle with cancer, his wish that his work be carried forward and extended is one which is fulfilled today by several people including Geoff Sharp, who continues Carl’s blog at http://landscheidt.auditblogs.com and augments it at a new site http://landscheidt.info. I have also used Carl’s insights to further my efforts at my own blog http://tallbloke.wordpress.com.
Anniversaries are important, they remind us we made it round the sun again! In Carl’s memory today, I’d like to open discussion of the fascinating longer cyclicities evident in the solar system’s exchanges of angular momentum by posting two graphs produced by Carl of the suns angular momentum relative to it’s motion around the solar system barycentre. The first gives a 6000 year broad sweep overview of the long term cycles:
The second gives a closer view of the last 400 years, and hints at the interesting self similarity of successive ~180 year periods.
It was Carl’s belief that these repeating periods coincided with the major climate events in our history as well as the solar grand minima. We may be entering one now, as the Sun is very coy about getting solar cycle 24 under way properly after a long minimum. Carl’s work has never been more relevant.