Fast changes between the solar seasons resolved by new sun clock
The declining phase of the current solar cycle 25 is predicted to be short. Whether that would follow a low peak remains to be seen, but not much has happened so far in the cycle.
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Violent activity on our Sun leads to some of the most extreme space weather events on Earth, impacting systems such as satellites, communications systems, power distribution and aviation, says Phys.org.
The roughly 11-year cycle of solar activity has three ‘seasons’, each of which affects the space weather felt at Earth differently: (i) solar maximum, the sun is active and disordered, when space weather is stormy and events are irregular (ii) the declining phase, when the sun and solar wind becomes ordered, and space weather is more moderate and (iii) solar minimum, when activity is quiet.
In a new study led by the University of Warwick and published in The Astrophysical Journal, scientists found that the change from solar maximum to the declining phase is fast, happening within a few (27 day) solar rotations.
They also showed that the declining phase is twice as long in even-numbered solar cycles as it is in odd-numbered cycles.
No two solar cycles are the same in amplitude or duration. To study the solar seasons, the scientists built a sun clock from the daily sunspot number record available since 1818. This maps the irregular solar cycles onto a regular clock.
The magnetic polarity of the sun reverses after each roughly 11 year solar cycle giving a roughly 22 year magnetic cycle (named after George Ellery Hale) and to explore this, a 22 year clock was constructed.
The effect on space weather at earth can be tracked back using the longest continuous records of geomagnetic activity over the past 150 years, and once the clock is constructed, it can be used to study multiple observations of seasonal solar activity which affect the earth.
With the greater detail afforded by the sun clock, the scientists could see that the switch from solar maximum to the declining phase is fast, occurring within a few (27 day) solar rotations.
There was also a clear difference in the duration of the declining phase when the sun’s magnetic polarity is ‘up’ compared to ‘down’: in even-numbered cycles it is around twice as long as odd-numbered cycles.
As we are about to enter cycle 25, the scientists anticipate that the next declining phase will be short.
Full article here.
Source: https://tallbloke.wordpress.com/2021/08/18/fast-changes-between-the-solar-seasons-resolved-by-new-sun-clock/
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