European Solar Physics Online Seminar Archive

Following an initiative by the University of Oslo the MPS will participate in the "European Solar Physics Online Seminar" series (ESPOS). Details can be found here: https://folk.uio.no/tiago/espos/
The aim of this video conference series is to promote ideas more widely with a specialized audience, and give some exposure to cutting-edge research for students and other young researchers that do not regularly travel to conferences. The ESPOS series is planned to take place every second Thursday at 11am.

ESP Online Seminar: On the Importance of Non-equilibrium Ionisation. Understanding (D. Nobrega Siverio) the Enhanced Emissivity of Si IV and O IV in Solar Surges

ESPOS
Surges are ubiquitous cool ejections in the solar atmosphere that often appear associated with other interesting phenomena such as UV bursts or coronal jets. Recent observations from the Interface ... [more]

ESP Online Seminar: The Magnetic Nature of the Umbra-Penumbra Boundary in Sunspots (J. Jurčák)

ESPOS
Sunspots are the longest known manifestation of solar activity and their magnetic nature has been known for more than a century. Despite this, the boundary between umbrae and penumbrae, the two ... [more]

ESP Online Seminar: Dissecting bombs and bursts: inversions of reconnection events in SST-IRIS observations (G. Vissers)

ESPOS
Ellerman bombs and UV bursts are transient brightenings that are ubiquitously observed in the lower atmospheres of active and emerging flux regions. While some Ellerman bombs display clear UV burst ... [more]

ESP Online Seminar: What can numerical simulations tell us about the mechanism of solar and stellar activity? (J. Warnecke)

ESPOS
The magnetic field in the Sun undergoes a cyclic modulation with a reversal typically every 11 years due to a dynamo operating under the surface. Also, other solar-like stars exhibit magnetic ... [more]

ESP Online Seminar: Frequency-dependent Damping of Slow Magneto-acoustic Waves in Sunspots (K. Prasad )

ESPOS
Propagating slow magneto-acoustic waves are regularly observed in the solar corona, particularly in sunspot related loop structures. These waves exhibit rapid damping as they propagate along the ... [more]

ESP Online Seminar: Recurrent CME-like Eruptions in Flux Emergence Simulations (P. Syntelis)

ESPOS
Ellerman bombs and UV bursts are transient brightenings that are ubiquitously observed in the lower atmospheres of active and emerging flux regions. While some Ellerman bombs display clear UV burst ... [more]

ESP Online Seminar: Search for predicted periodic flows in loops undergoing thermal non-equilibrium (G. Pelouze)

ESPOS
Long-period intensity pulsations have been recently detected in coronal loops with EUV images of both SoHO/EIT (Auchère et al., 2014) and SDO/AIA (Froment et al., 2015). These pulsations have been ... [more]

ESP Online Seminar: Counter-streaming Flows of a Giant Solar Filament as Observed in the Extreme Ultraviolet (A. Dierke)

ESPOS
A giant solar filament was visible on the solar surface between 8-23 November 2011. The filament stretched over more than half a solar diameter. Multi-wavelength data from the SDO instrument AIA ... [more]

ESP Online Seminar: Interactions between pre-existing and emerging magnetic flux systems observed with IRIS (S. Guglielmino)

ESPOS
We report multi-wavelength ultraviolet observations taken with the IRIS satellite, concerning the emergence phase in the upper chromosphere and transition region of an emerging flux region (EFR) ... [more]

ESP Online Seminar: Searching for the Origin of Flares in M dwarfs (L. Doyle)

ESPOS
We present an overview of K2 short cadence observations for 32 M dwarfswhich have spectral types between M0-L1. All of the stars in our sampleshowed flares with the most energetic reaching 3x10^34 ... [more]

ESP Online Seminar: The spectral content of SDO/AIA 1600 and 1700 Å filters from flare and plage observations (P. Simões)

ESPOS
The strong enhancement of the ultraviolet emission during solar flares is usually taken as an indication of plasma heating in the low solar atmosphere caused by the deposition of the energy released ... [more]

ESP Online Seminar: Multi-height spectropolarimetric study of MHD waves in a big sunspot observed with IBIS (M. Stangalini)

ESPOS
We present preliminary results derived from the analysis of spectropolarimetric measurements of active region AR12546, which represents one of the largest sunspots to have emerged onto the solar ... [more]

ESP Online Seminar: Surface waves and instabilities in the presence of an inclined magnetic field (E. Vickers )

ESPOS
While surface waves propagating at tangential discontinuities have been studied in great detail, few studies have been dedicated to the investigation of the nature of waves at contact discontinuities ... [more]

ESP Online Seminar: Asymmetric Solar Waveguides: Theory and Observations (M. Allcock )

ESPOS
Are solar MHD waveguides symmetric? It is convenient to assume that they are. The solar physics community is familiar with the traditional notion of sausage and kink waves, which propagate along ... [more]

ESP Online Seminar: Ellerman bombs and UV bursts: reconnection at different atmospheric layers? (A. Ortiz)

ESPOS
The emergence of magnetic flux through the photosphere and into the outer solar atmosphere produces, amongst many other phenomena, the appearance of Ellerman bombs (EBs) in the photosphere. EBs are ... [more]

ESP Online Seminar: The association of RHESSI flares to the Hale Sector Boundary and Active Longitudes (K. Loumou)

ESPOS
Are some parts of the Interplanetary Magnetic Field’s (IMF) neutral line more flare energetic than others? What are Hale Sector Boundaries (HSBs) and are they connected with flares? Do they have ... [more]

ESP Online Seminar: A new method for measuring the Wilson depression of sunspots (Björn Löptien)

ESPOS
The Wilson depression is the difference in geometric height of the layer of unit continuum optical depth between the sunspot umbra and the quiet Sun. Measuring the Wilson depression is important for ... [more]
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