Journal cover Journal topic
Annales Geophysicae An open-access journal of the European Geosciences Union
Ann. Geophys., 35, 805-816, 2017
https://doi.org/10.5194/angeo-35-805-2017
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 3.0 License.
Review paper
14 Jul 2017
Our dynamic sun: 2017 Hannes Alfvén Medal lecture at the EGU
Eric Priest 1Mathematics Institute, St Andrews University, St Andrews KY16 9SS, UK
*Invited contribution by Eric Priest, recipient of the EGU Hannes Alfvén Medal for Scientists 2017
Abstract. This lecture summarises how our understanding of many aspects of the Sun has been revolutionised over the past few years by new observations and models. Much of the dynamic behaviour of the Sun is driven by the magnetic field since, in the outer atmosphere, it represents the largest source of energy by far.

The interior of the Sun possesses a strong shear layer at the base of the convection zone, where sunspot magnetic fields are generated. A small-scale dynamo may also be operating near the surface of the Sun, generating magnetic fields that thread the lowest layer of the solar atmosphere, the turbulent photosphere. Above the photosphere lies the highly dynamic fine-scale chromosphere, and beyond that is the rare corona at high temperatures exceeding 1 million degrees K. Possible magnetic mechanisms for heating the corona and driving the solar wind (two intriguing and unsolved puzzles) are described.

Other puzzles include the structure of giant flux ropes, known as prominences, which have complex fine structure. Occasionally, they erupt and produce huge ejections of mass and magnetic fields (coronal mass ejections), which can disrupt the space environment of the Earth. When such eruptions originate in active regions around sunspots, they are also associated with solar flares, in which magnetic energy is converted to kinetic energy, heat and fast-particle energy. A new theory will be presented for the origin of the twist that is observed in erupting prominences and for the nature of reconnection in the rise phase of an eruptive flare or coronal mass ejection.


Citation: Priest, E.: Our dynamic sun: 2017 Hannes Alfvén Medal lecture at the EGU, Ann. Geophys., 35, 805-816, https://doi.org/10.5194/angeo-35-805-2017, 2017.
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Short summary
A review is given of major progress towards addressing unsolved fundamental puzzles about the Sun. The solar magnetic field is generated by dynamo action in the solar interior. Several mechanisms may heat the corona to 106 K and drive the solar wind. Occasionally, giant flux ropes (prominences) erupt and produce huge CMEs and solar flares. A new theory is presented for the origin of the twist observed in erupting prominences and the nature of reconnection in the rise phase of a flare or CME.
A review is given of major progress towards addressing unsolved fundamental puzzles about the...
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