The Dicke cycle: A ˜27-day solar oscillation

Details The Dicke cycle: A ˜27-day solar oscillation The Dicke cycle: A ˜27-day solar oscillation

Feb 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010jastp..72..139v&link_type=abstract

Journal of Atmospheric and Solar-Terrestrial Physics, Volume 72, Issue 2-3, p. 139-142.

Physics

1

Solar Euv, Solar Rotation, Solar-Terrestrial Relations

Scientific paper

Measurements of solar EUV irradiance show, besides the ~11-year Schwabe cycle, a series of oscillations with a ~27-day period. They are generally explained by the passage of active regions across the solar surface resulting from the Sun's rotation, but the calculated amplitude underestimates the observed long-term variation in irradiance (Lean 1991). The variant of this model proposed here is modulation of EUV emission from the corona by rotation of the Sun's radiative zone. The response would be immediate, raising the prospect of short-term forecasting of EUV effects on space weather and on the Earth's atmospheric circulation.

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