IMAGe Seminar - Injection and release of free energy, magnetic helicity, and electric currents in the solar atmosphere

01/14/2015 - 1:30pm
Center Green 1 - South Auditorium

Injection and release of free energy, magnetic helicity, and electric currents in the solar atmosphere

Kevin Dalmasse, CISL/IMAGe and HAO

Link to Recording


In the solar atmosphere, the signatures of solar activity are transient, localized brightenings, during which a localized region is rapidly and temporarily heated, i.e., solar flares. The origin of solar flares is magnetic and comes from the evolution of current-carrying magnetic fields. These magnetic fields are essential for solar activity because they store the magnetic energy that can be released during solar flares. The work that I did during my PhD aimed at better understanding and quantifying the role of current-carrying magnetic fields for solar activity in the framework of magnetohydrodynamics (MHD). For that purpose, I jointly studied three physical quantities, the properties of which give information on the properties of eruptive magnetic fields: relative magnetic helicity (which quantifies the geometrical properties of the magnetic field, i.e., its shear, its twist); electric currents; and free magnetic energy (the magnetic energy of the current-carrying magnetic fields). After a general introduction, I will present the results of this work.

Date:      Wednesday, January 14, 2015
Time:      1:30–2:30 pm
Location: CG1-S. Auditorium