Quasi-annual variations may hold clues to space weather
A number of NASA instruments captured detailed images of this coronal mass ejection on Aug. 31, 2012. Although CMEs can damage sensitive technological systems, this one just struck a glancing blow to Earth’s atmosphere. New research that quasi-annual variations in solar activity, which may help experts better forecast these powerful events.
Credit Image by NASA
BOULDER -The Sun undergoes a type of seasonal variability with its activity waxing and waning over the course of nearly two years, according to a new study by a team of researchers led by the National Center for Atmospheric Research (NCAR). This behavior affects the peaks and valleys in the approximately 11-year solar cycle, sometimes amplifying and sometimes weakening the solar storms that can buffet Earth’s atmosphere.
The quasi-annual variations appear to be driven by changes…
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