Quote:
Originally Posted by freebeard
A more recent example was the week or more in 2011. DDG's top result https://weathermodificationhistory.com › september-11-2001-airline-groundings-contrails-affect-daily-temperature-range
September 11, 2001 Airline Groundings: Contrails Affect Daily ...
During the 11-14 September 2001 grounding period natural clouds and contrails were noticeably absent on high-resolution satellite imagery across the regions that typically receive abundant contrail coverage. A previous analysis of temperature data for the grounding period reported an anomalous increase in the U.S.-averaged, 3-day DTR value. Is the 12,000-year cycle more likely to be asteroids or vulcanism? |
1) I don't have anything with me for a 12,000-year cycle.
2) The asteroids large enough to be detected are continuously monitored around the clock.
3) 'Vulcanism' or 'Volcanism?' I don't know anything about 'vulcanism'.
4) Volcanism is not periodic in nature. There are no 'cycles' associated with it that I've experienced in the literature. It is associated with tidal forces, plate tectonics, lithospheric isostatic rebound as ice sheets melt, and seismic activity.
5) The Milankovich 'wobble' has a periodicity of 23,000-years.
6) The 'tilt' cycle is 41,000-years.
7) The 'ellipticity' cycle is 96,000-years.
8) The solar sunspot cycle is eleven years, with a delta-irradiance of 0.50%.