Solar magnetic field and irradiance: how unusual is the current minimum? (Invited)

Details Solar magnetic field and irradiance: how unusual is the current minimum? (Invited) Solar magnetic field and irradiance: how unusual is the current minimum? (Invited)

Dec 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufm.u34a..01s&link_type=abstract

American Geophysical Union, Fall Meeting 2009, abstract #U34A-01

Astronomy and Astrophysics

Astrophysics

[2162] Interplanetary Physics / Solar Cycle Variations, [7524] Solar Physics, Astrophysics, And Astronomy / Magnetic Fields, [7538] Solar Physics, Astrophysics, And Astronomy / Solar Irradiance

Scientific paper

In many respects the current minimum of solar activity is rather different from other minima during the last half century, which has seen the Sun in a state of unusually high activity. This uncommon minimum has fascinated solar physicists. Of particular importance for our understanding is the behaviour of the magnetic field, which is the source of all activity observed in the solar atmosphere, including the heliosphere. Furthermore, the evolution of dark and bright magnetic features on the solar surface modulates the solar irradiance, which could directly influence the Earth's climate. In this presentation observations and models of the evolution of the Sun's magnetic field and irradiance are reviewed. After discussing the variation of these quantities over the solar cycle and from cycle to cycle, the current minimum is considered in greater detail. It is compared to earlier minima going back to the Maunder minimum and, in a more averaged sense, to solar activity and irradiance during the whole Holocene. Questions that will be considered are: Are we leaving the period of high solar activity (a grand maximum) to enter into a phase of more moderate activity, or even into a grand minimum? How could such a change in the level of the magnetic field and irradiance aid us in gaining further insight into the nature of the Sun's influence on the Earth's climate?

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