Search Publications
On the Physical Nature of the so-Called Prominence Tornadoes
Heinzel, Petr; Schmieder, Brigitte; Labrosse, Nicolas +7 more
The term `tornado' has been used in recent years to describe several solar phenomena, from large-scale eruptive prominences to small-scale photospheric vortices. It has also been applied to the generally stable quiescent prominences, sparking a renewed interest in what historically was called `prominence tornadoes'. This paper carries out an in-de…
Slow-Mode Magnetoacoustic Waves in Coronal Loops
Reale, Fabio; Srivastava, Abhishek K.; Ofman, Leon +3 more
Rapidly decaying long-period oscillations often occur in hot coronal loops of active regions associated with small (or micro-) flares. This kind of wave activity was first discovered with the SOHO/SUMER spectrometer from Doppler velocity measurements of hot emission lines, thus also often called "SUMER" oscillations. They were mainly interpreted a…
Linking the Sun to the Heliosphere Using Composition Data and Modelling
Del Zanna, Giulio; Wimmer-Schweingruber, Robert F.; Lynch, Benjamin J. +13 more
Our understanding of the formation and evolution of the corona and the heliosphere is linked to our capability of properly interpret the data from remote sensing and in-situ observations. In this respect, being able to correctly connect in-situ observations with their source regions on the Sun is the key for solving this problem. In this work we a…
Origins of the Ambient Solar Wind: Implications for Space Weather
Cranmer, Steven R.; Riley, Pete; Gibson, Sarah E.
The Sun's outer atmosphere is heated to temperatures of millions of degrees, and solar plasma flows out into interplanetary space at supersonic speeds. This paper reviews our current understanding of these interrelated problems: coronal heating and the acceleration of the ambient solar wind. We also discuss where the community stands in its abilit…
Radiative Diagnostics in the Solar Photosphere and Chromosphere
van Noort, M.; de la Cruz Rodríguez, J.
Magnetic fields on the surface of the Sun and stars in general imprint or modify the polarization state of the electromagnetic radiation that is leaving from the star. The inference of solar/stellar magnetic fields is performed by detecting, studying and modeling polarized light from the target star. In this review we present an overview of techni…
Measurements of Photospheric and Chromospheric Magnetic Fields
Gosain, Sanjay; Lagg, Andreas; Lites, Bruce +2 more
The Sun is replete with magnetic fields, with sunspots, pores and plage regions being their most prominent representatives on the solar surface. But even far away from these active regions, magnetic fields are ubiquitous. To a large extent, their importance for the thermodynamics in the solar photosphere is determined by the total magnetic flux. W…
Solar Magnetoconvection and Small-Scale Dynamo. Recent Developments in Observation and Simulation
Solanki, S. K.; Borrero, J. M.; Schüssler, M. +1 more
A number of observational and theoretical aspects of solar magnetoconvection are considered in this review. We discuss recent developments in our understanding of the small-scale structure of the magnetic field on the solar surface and its interaction with convective flows, which is at the centre of current research. Topics range from plage areas …
Solar Coronal Jets: Observations, Theory, and Modeling
Young, P. R.; Curdt, W.; Raouafi, N. E. +13 more
Coronal jets represent important manifestations of ubiquitous solar transients, which may be the source of significant mass and energy input to the upper solar atmosphere and the solar wind. While the energy involved in a jet-like event is smaller than that of "nominal" solar flares and coronal mass ejections (CMEs), jets share many common propert…
Slow Solar Wind: Observations and Modeling
Li, B.; Harra, L.; Riley, P. +9 more
While it is certain that the fast solar wind originates from coronal holes, where and how the slow solar wind (SSW) is formed remains an outstanding question in solar physics even in the post-SOHO era. The quest for the SSW origin forms a major objective for the planned future missions such as the Solar Orbiter and Solar Probe Plus. Nonetheless, r…
Review on Current Sheets in CME Development: Theories and Observations
Reeves, Katharine K.; Lin, Jun; Raymond, John C. +5 more
We introduce how the catastrophe model for solar eruptions predicted the formation and development of the long current sheet (CS) and how the observations were used to recognize the CS at the place where the CS is presumably located. Then, we discuss the direct measurement of the CS region thickness by studying the brightness distribution of the C…