There are Talkshop blog readers who have a considerable interest in the solar barycentre, a taboo subject in many places, possibly because of excessive claims and obsession, makes dreadful coffee too.
Personally I don’t know but the idea has merit as a possible mechanism for something, what we don’t know. It’s worth remembering gravity is not the only solar linkage to the outside, magnetic and electrical connections are present, moreover interaction with planets is to a degree selective because they vary in their magnetic field.
The sun itself is also spinning in strange ways. Does it have a singular core and if so is that spinning? Spin means gyroscopic effects.
I’d forgotten to look at the Z-axis so here is the remedy.
This was produced by Solex 11 using ephemeris 406, which is better for long term than the more recent fine tuned to recent parameters. (ephemeris are approximations anyway)
Output was from year 1400 at 10 day intervals, frequent enough to avoid Nyquist problems, through year 2100, about 27,000 datapoints.
Solex is set to centric -1 which then asks for the absolute ZYX of the point to use, 0,0,0 sets solar barycentre. (which it recognises and names)
A problem is whether there ought to be a reference plane rotation but to what, such as what is the sun rotation axis? Or perhaps the mean planetary plane. Any ideas?
Lot of information on co-ords and computation is here.
Specific post process calculation is under Spherical and Cartesian Coordinates, theta.
All the data and computation excluding filtering is provided in this spreadsheet portable XLS 97/2000/xp which might be useful for anyone wanting barycentre data for other purposes.
Comment on Figure 1
The angular range is about +-0.4 radians, greater than I expected and is somewhat irregular.
The effect of low pass filtering is in essence integrating the effect where the relatively rapid movements could be considered as pulse width modulation, it really depends on how the sun might react, fast or slow?
The obvious pattern is unsurprisingly on the known ~178 year period, which also does not repeat exactly.
A reference to Fairbridge in the SAO/NASA catalog seems fun here but a web search will unearth a mountain of items. Try this
178 year solar period
The effect of a gravitational asymmetry on a spinning sun is unknown but I have an interest in solar asymmetry (north/south difference) and can be seen in the sunspot area traces here
A connection? I have no idea but it is a rational possibility.
The two most recent pattern anomalies in figure 1 are ~1815 when the sun came out of deep slumber and 1991 during the peak of cycle 22.
Plan view of ~1810 event showing close approach of solar centre to barycentre.
Same for 1991 event.
Not shown is the distance, spin vector or velocity, there is a lot which needs detail examination.
Quite soon I expect to post something further, a curious detail which points to yet another factor to keep in mind.
So far as I know no-one has yet directly linked barycentre effects with actual solar activity.
Post by Tim Channon, co-moderator