Solar Flares - How the Sun Relaxes
Ζωντανή μετάδοση στις 23 Φεβ 2017
Host: Edward DeLuca
Speaker: Lyndsay Flectcher (University of Glasgow)
The
outer atmosphere of the Sun is a magnetically-dominated environment.
The magnetic field determines the transport, storage and dissipation of
energy, in fairly steady ways (coronal heating, solar wind acceleration)
but also in abrupt and impulsive events called solar flares. Solar
flares represent the rapid conversion of energy as the magnetically
stressed corona relaxes, with magnetic energy going into plasma heating,
the KE of accelerated particles and mass motions. Flares are now
observed in exquisite detail with imaging and spectroscopy across the
electromagnetic spectrum, allowing increasingly meaningful comparisons
with detailed theory. In this talk I will give a general overview of
recent flare observations and the framework in which they are
interpreted, before focusing on one aspect of flare physics, namely the
need to rapidly transport energy through the corona and accelerate
particles. I will also place our knowledge of solar flares in the
context of what we are learning about stellar flares.
Speaker: Lyndsay Flectcher (University of Glasgow)
The
outer atmosphere of the Sun is a magnetically-dominated environment.
The magnetic field determines the transport, storage and dissipation of
energy, in fairly steady ways (coronal heating, solar wind acceleration)
but also in abrupt and impulsive events called solar flares. Solar
flares represent the rapid conversion of energy as the magnetically
stressed corona relaxes, with magnetic energy going into plasma heating,
the KE of accelerated particles and mass motions. Flares are now
observed in exquisite detail with imaging and spectroscopy across the
electromagnetic spectrum, allowing increasingly meaningful comparisons
with detailed theory. In this talk I will give a general overview of
recent flare observations and the framework in which they are
interpreted, before focusing on one aspect of flare physics, namely the
need to rapidly transport energy through the corona and accelerate
particles. I will also place our knowledge of solar flares in the
context of what we are learning about stellar flares.
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