The non-existence of Gliese 581 f was accepted relatively quickly : it was shown that the radial velocity variations that led to the claimed discovery of Gliese 581 f were instead associated with the stellar activity cycle rather than an orbiting planet.
32.
These external forces usually contribute to climate change on a time scale, as meteorites strike the earth, on average, every 50 to 100 million years, where as geomagnetic storms occur periodically through the sun s eleven-year activity cycle.
33.
They say the results lend tenuous support to a highly controversial theory that the earth is cloudier, and therefore reflects more sunlight, when the sun is near the minimum of its 11-year activity cycle and has the fewest sunspots and solar storms.
34.
Observations of short term variations in the chromatic activity suggest that the star undergoes differential rotation, with a rotation period of about 11 13 days . Its surface has a measured activity cycle of 16.6 years, compared to 11 years on the Sun.
35.
The orbit of the stars in the binary pair is gravitationally coupled to their shape changes, so that the period shows modulations ( typically on the order of " P / P < " 10 " 5 ) on the same time scale as the activity cycles ( typically on the order of decades ).
36.
The "'solar cycle "'or "'solar magnetic activity cycle "'is the nearly periodic 11-year change in the Sun's activity ( including changes in the levels of solar radiation and ejection of solar material ) and appearance ( changes in the number and size of sunspots, flares, and other manifestations ).
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