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Alexei Pevtsov (NSO)

How well can we reconstruct past solar magnetic activity
When Jun 28, 2018 from 02:30 PM to 03:30 PM
What
  • Colloquium
Where SH Lecture Hall
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Magnetic fields form a foundation for all solar active phenomena from the smallest to the largest spatial scales. They serve as a reservoir of energy for flares, play critical role in triggering mechanisms for coronal mass ejections, and provide the means of transporting energy from the photosphere to the corona. Modern studies use observations of large-scale and polar magnetic field to represent the topology of solar and heliospheric magnetic fields, to evaluate the total and spectral solar irradiance, and predict the amplitude of future solar cycles. However, systematic magnetograph observations are only available since late 1960. The reconstruction of magnetic data from historical non-magnetic observations is possible, but it has several limitations. In this talk, I will present the results of recent studies aimed at reconstructing past magnetic activity of the Sun using historical observations and discuss various pitfalls related to such reconstructions.