Conveners
Poster Session 2.5
- Alessandro Bemporad (Istituto Nazionale di Astrofisica (INAF))
We hereby present the interferometric LOFAR observations of the solar radio event on 22 August 2017, during which the type III radio bursts have been detected. Solar radio image and dynamic spectra were recorded in the 10 – 90 MHz frequency band. Additionally to LOFAR observations, the data recorded by instruments onboard the Solar Dynamics Observatory (SDO) in the UV spectral range, GOES and...
The atmospheric conditions of the Sun are encoded within the line emission of different atomic transitions (spectra). To infer the physics of the solar atmosphere from spectra, we have to compare these observations with synthetic outputs from simulations. It is however often the case that the thermodynamic solutions satisfying an observation are degenerate, with different variations of...
AB Dor is an active rapidly rotating K0 dwarf which rotates $\sim$ 50 times faster than the Sun. We have studied flare light curves from AB Dor using the archival observations from the XMM-Newton satellite and detected quasi-periodic pulsations (QPPs). Periods and damping times of QPPs are derived and compared to those for solar and other stellar flares. These parameters are generally found...
We present observations of an M class flare with the LOw Frequency ARray (LOFAR) in the moring hours of 7 September 2017. The flare was accompanied by strong type III radio bursts. LOFAR interferometric images in the low band frequency range of 20 - 80 MHz show distinct sources that show variations in their positions, and intermittent dual source structures. We identify these as fundamental...
The Sun produces highly dynamic and eruptive events that can drive shocks through the corona. These shocks can accelerate electrons, which result in plasma emission in the form of a type II radio burst. Despite the large number of type II radio bursts observations, the precise origin of coronal shocks is still subject to investigation. Here we present a well observed solar eruptive event that...
Solar radio spikes are short duration and narrow bandwidth fine structures in dynamic spectra observed from tens of MHz to the GHz range. Their very short duration (10-1000 s) and narrowband emission is indicative of the possibly fastest small-scale energy release processes observed in the solar corona, yet the origin of the spikes is not established. We present, for the first time,...
Plasma turbulence can be viewed as a magnetic landscape populated by large- and small-scale coherent structures, consisting notionally of magnetic flux tubes and their boundaries. Such structures exist over a wide range of scales and exhibit diverse morphology and plasma properties. Interactions of particles with turbulence may involve temporary trapping in, as well as exclusion from, certain...
