K is the 11th letter of the alphabet.
Could11.3mean the same asK-3
A measure of solar storm intensity?
If so, we have just passed the 11.3 marker as Nov 4th solar storm reaches K-4.
https://www.swpc.noaa.gov/products/planetary-k-index
It would seem that we know a lot more about solar storms, and have studied their fluxes for a much longer time than most people realize. Long enough to be able to predict when Earth will be hit by the BIG ONE
The Great Space Weather Event during February 1872 Recorded in East Asia
Abstract
The study of historical great geomagnetic storms is crucial for assessing the possible risks to the
technological infrastructure of a modern society, caused by extreme space‒weather events. The
normal benchmark has been the great geomagnetic storm of September 1859, the so-called
‘Carrington Event’. However, there are numerous records of another great geomagnetic storm in
February 1872. This storm, about 12 years after the Carrington Event, resulted in comparable
magnetic disturbances and auroral displays over large areas of the Earth. We have revisited this great
geomagnetic storm in terms of the auroral and sunspot records in the historical documents from East
Asia. In particular, we have surveyed the auroral records from East Asia and estimated the
equatorward boundary of the auroral oval to be near 24.3° invariant latitude (ILAT), on the basis that
the aurora was seen near the zenith at Shanghai (20° magnetic latitude, MLAT). These results
confirm that this geomagnetic storm of February 1872 was as extreme as the Carrington Event, at
least in terms of the equatorward motion of the auroral oval. Indeed, our results support the
interpretation of the simultaneous auroral observations made at Bombay (10° MLAT). The East
Asian auroral records have indicated extreme brightness, suggesting unusual precipitation of highintensity, low-energy electrons during this geomagnetic storm. We have compared the duration of
the East Asian auroral displays with magnetic observations in Bombay and found that the auroral
displays occurred in the initial phase, main phase, and early recovery phase of the magnetic storm.
https://arxiv.org/pdf/1807.05186.pdf
http://adsabs.harvard.edu/pdf/1977SoPh…53….3H
http://adsabs.harvard.edu/full/1968SoPh….5..338W
https://arxiv.org/pdf/1911.02251.pdf
By 2030 lightning bolts the size of tornadoes will ravage the surface.
The only humans guaranteed to survive with sanity intact will be in the tunnels, caves and lava tubes