The patterns of the changes in
magnetic field strength over 48 hours seen in these two events were so
similar to those recorded in a ground sensor during the Carrington event that the first event must not have been global in its reach either, the team reports in the Journal of Space Weather and Space Climate.
Portrait of a young planet The Jack Hills zircons show that a
magnetic field existed as early as 4 billion years ago, fluctuating in
strength from a value
similar to today's — around 25 microteslas — to about 12 % of that.
The Earth's
field sustains the magnetosphere and it is not constant either, it shows
similar decadal variability, as shown in the data from and used by number of distinguished geo -
magnetic scientists and researchers (Jault Gire, LeMouel, J. Bloxham, D. Gubbins, A.Jackson, R. Hide, D. Boggs, J. Dickey etc,) Since changes in either of two
fields affect
strength of the magnetosphere, it would be expected that the «magnetospheric variability» time function could be produced by combining two sets of available data.