Sun-Earth-Man - PlasmaResources

IN-EARTH-MAN. A MESH OFCOSMICOSCILLATIONS
Figure 23: Smoothed running variance V of the Sun's equatorial angular sidereal rotation rate (Mount W&* data)
covering Carrington rotat~ons 1516 (December 29.1%) to 1726 (September 4.1982). Fat arrows point ~OW-CM-CS~
epochs (C), while a hiangle marks the epoch of a JU-CM-CSg event (G). Arrow-heads designare harmonics dquasi.
cycles formed by mnsecutive JU-CM-CS events.
of the variance cover two consecutive rotations, thus measuring the variation
in variability from one rotation to the next one. These results have been
subjected to a Gaussian low-pass filter eliminating short range features
covering less than five rotations. The ordinate axis measures this smoothed
running variance. The epochs of JU-CM-CS events in 1967.8 and 1974.48 are
marked by fat arrows and the letter C, whereas the epoch of the event in
1970.02 is indicated by a fat triangle and the le!ter G. This makes allowance
for the two types of JU-CM-CS events mentioned already: those that go along
with an increase in orbital momentum and resulting centrifugal motion of the
Sun (C), and those that initiate a decrease in orbital momentum and centripetal
motion due to prevailing gravitation (G).
The two C-conjunctions are related to prominent variance peaks significant
at the 85% confidence level (CL) and far beyond. If the running variance is
not subjected to smoothing, the second C-peak in 1974 reaches the 95%
confidence level. There is only a relatively small variance peak connected with
the G-conjunction in 1970. This points to a different quality of this kind of
events, which was to be expected, as the orbital momentum does not increase,
but is diminished. Nevertheless, G-conjunctions, too, have an impact on the
Sun's differential rotation. The Mount Wilson rotation data do not cover the
following C-conjunction in 1982.8. It is beyond the kame of the plot. If
consecutive conjunctions are thought to form quasi-cycles initiated by the