ARLA/CLUSTER: Entre 18 e 19 de Setembro de 1941 registou-se a maior tempestade geomagnetica do seculo XX

[João Costa > CT1FBF]

The Geomagnetic Blitz of September 1941

Seventy-five years ago, on 18–19 September 1941, the Earth experienced
a great magnetic storm, one of the most intense ever recorded.

It arrived at a poignant moment in history, when radio and electrical
technology was emerging as a central part of daily life and when much
of the world was embroiled in World War II, which the United States
had not yet officially entered.

The illuminated night sky exposed an Allied convoy to German attack.
Auroras danced across the night sky as voltage surged in power grid
lines. A radio blackout interrupted fan enjoyment of a baseball game,
while another radio program was interrupted by private phone
conversations. Citizens, already on edge, wondered if neon lights were
some sort of antiaircraft signal. And far away in the North Atlantic,
the illuminated night sky exposed an Allied convoy to German attack.

These effects raised awareness within the scientific community and
among the public of the societal significance of the effects that the
Sun and outer space can have on the Earth—what we now call space
weather.

Read the full article - The Geomagnetic Blitz of September 1941
https://eos.org/features/the-geomagnetic-blitz-of-september-1941