Now showing items 1-10 of 174
Validation of the magnetic energy vs. helicity scaling in solar magnetic structures
(2014-10) - Journal item,
Aims. We assess the validity of the free magnetic energy - relative magnetic helicity diagram for solar magnetic structures. Methods. We used two different methods of calculating the free magnetic energy and the relative ...
Statistical evidence for the existence of Alfvénic turbulence in solar coronal loops
(2014-12-10) - Journal article,
Recent observations have demonstrated that waves capable of carrying large amounts of energy are ubiquitous throughout the solar corona. However, the question of how this wave energy is dissipated (on which timescales and ...
A new technique for observationally derived boundary conditions for space weather
(2018-04-17) - Journal article,
Context. In recent years, space weather research has focused on developing modelling techniques to predict the arrival time and properties of coronal mass ejections (CMEs) at the Earth. The aim of this paper is to propose ...
Contribution of phase-mixing of Alfvén waves to coronal heating in multi-harmonic loop oscillations
(2018-04-26) - Journal article,
Context. Kink oscillations of a coronal loop are observed and studied in detail because they provide a unique probe into the structure of coronal loops through MHD seismology and a potential test of coronal heating through ...
Collisionless distribution functions for force-free current sheets : using a pressure transformation to lower the plasma beta
(2018-06-14) - Journal article,
So far, only one distribution function giving rise to a collisionless nonlinear force-free current sheet equilibrium allowing for a plasma beta less than one is known (Allanson et al., Phys. Plasmas, vol. 22 (10), 2015, ...
The Paris Observatory appoints a director in 1907
(2018-12-12) - Journal article,
The energy budget of stellar magnetic fields : comparing non-potential simulations and observations
(2017-03-21) - Journal article,
The magnetic geometry of the surface magnetic fields of more than 55 cool stars have now been mapped using spectropolarimetry. In order to better understand these observations, we compare the magnetic field topology at ...
Broadening of the differential emission measure by multi-shelled and turbulent loops
(2018-12) - Journal article,
Context. Broad differential emission measure (DEM) distributions in the corona are a sign of multi-thermal plasma along the line-of-sight.Traditionally, this is interpreted as evidence of multi-stranded loops. Recently, ...
Magnetic helicity condensation and the solar cycle
(2018-12) - Journal article,
Solar filaments exhibit a global chirality pattern where dextral/sinistral filaments, corresponding to negative/positive magnetic helicity, are dominant in the northern/southern hemisphere. This pattern is opposite to the ...
Formation and large-scale patterns of filament channels and filaments
(Springer, 2015) - Book item,
The properties and large-scale patterns of filament channels and filaments are considered. Initially, the global formation locations of filament channels and filaments are discussed, along with their hemispheric pattern. ...