Sentences with phrase «magnetic cycle»
Starting in the 1960's at the Mt. Wilson Observatory O.C. Wilson (sic) began a long - term study of magnetic cycles in cool stars using as his observational indicator the variable emission flux of the H and K resonance lines of ionized calcium whose appearance in emission is characteristic of stellar chromospheres.
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The 22 - year magnetic cycle was discovered in 1925 by the American astronomer George Ellery Hale.
Understanding this cycle is one of the biggest outstanding problems in solar physics, in part because it does not appear to match magnetic cycles observed on other solar - type stars — leading some to suggest the Sun is fundamentally different.
Here, by carrying out a series of simulations of stellar magnetic fields, Antoine Strugarek and colleagues show that the Sun's magnetic cycle depends on its rotation rate and luminosity.
A larger sixth planet, closer in mass to Saturn, also appears significantly in the data at a greater distance from HD 10180, but the study's authors note that the signal could be caused by a long - term magnetic cycle on the star rather than the tug of an orbiting planet.
The Rickies (rapid climate change events RCCEs), correlate with massive solar magnetic cycle events and unexplained geomagnetic changes.
In addition, with the solar magnetic cycle in a minimum, the large scale magnetic field and solar heliosphere should be reduced.
After looking at more than 25 magnetic cycles, researchers found that the length of each star's cycle is related to its rotation rate and brightness, they report today in Science.
This relationship can be expressed in terms of the so - called Rossby number; they show that the magnetic cycle of the Sun is inversely proportional to this number.
The brightening could be due to a magnetic cycle like the sun's, Simon suggests.
If you had asked me five years ago, I would have said by and large we have an idea about how the magnetic cycle works on the sun, says Rosner.
Title: The Long and the Short of It: Timescales for Stellar Activity Abstract: Stellar activity varies on a range of timescales, from the long - term decrease due to stellar spindown, through the shorter timescales of magnetic cycles and the rapid fluctuations of flares and coronal mass ejections.
Stellar activity varies on a range of timescales, from the long - term decrease due to stellar spindown, through the shorter timescales of magnetic cycles and the rapid fluctuations of flares and coronal mass ejections.
Research interests: automated astronomy with robotic telescopes, high - precision photometry, luminosity and magnetic cycles in solar - type stars, the search for extrasolar planets, chromospherically active stars, pulsating variable stars More
However, we conclude that the imprint of this Modern Maximum (e.g. Earth climate forcing) would essentially result from time - integration effects (system inertia), since exceptionally high amplitudes of the solar magnetic cycle can not be invoked anymore.