Search Publications
Solar Observations with Single-Dish INAF Radio Telescopes: Continuum Imaging in the 18 - 26 GHz Range
Iacolina, M. N.; Pellizzoni, A.; Egron, E. +28 more
We present a new solar radio imaging system implemented through the upgrade of the large single-dish telescopes of the Italian National Institute for Astrophysics (INAF), not originally conceived for solar observations.
Transverse Oscillation of Coronal Loops Induced by Eruptions of a Magnetic Flux Tube and a Plasmoid
Maurya, Ram Ajor; Safna Banu, K.; Jain Jacob, P. T.
We studied transverse oscillations in hot coronal loops of active region NOAA 12673 located at the west limb. Loop oscillations were associated with a plasmoid ejection from the same location. During the rising phase of the plasmoid, a magnetic flux tube was seen to be rising and bending towards the loop system that erupted before the plasmoid eje…
Interferometric Imaging, and Beam-Formed Study of a Moving Type-IV Radio Burst with LOFAR
Kumari, Anshu; Zucca, Pietro; Kim, Sujin +6 more
Type-IV radio bursts have been studied for over 50 years. However, the specifics of the radio emission mechanisms is still an open question. In order to provide more information about the emission mechanisms, we studied a moving Type-IV radio burst with fine structures (spike group) by using the high-resolution capability of the Low-Frequency Arra…
On the Evolution of a Sub-C Class Flare: A Showcase for the Capabilities of the Revamped Catania Solar Telescope
Spadaro, Daniele; Guglielmino, Salvo L.; Romano, Paolo +9 more
Solar flares are occasionally responsible for severe space-weather events, which can affect space-borne and ground-based infrastructures, endangering anthropic technological activities and even human health and safety. Thus, an essential activity in the framework of space-weather monitoring is devoted to the observation of the activity level on th…
Migrating Dynamo Waves and Consequences for Stellar Current Sheets
Sokoloff, Dmitry; Malova, Helmi; Popov, Victor +2 more
We study the relation between stellar dynamo-wave propagation and the structure of the stellar magnetic field. Modeling dynamo waves by the well-known Parker migratory dynamo, we vary the intensity of dynamo drivers in order to obtain activity-wave propagation toward the Equator (as in the solar-activity cycle) or towards the Poles. We match the m…
Tomography of the Solar Corona with the Metis Coronagraph I: Predictive Simulations with Visible-Light Images
Romoli, Marco; Frassati, Federica; Bemporad, Alessandro +5 more
The Solar Orbiter/Metis coronagraph records full-Sun visible-light polarized brightness (p B -) images of the solar corona. This work investigates the utility of a synoptic observational program of Metis for tomographic reconstruction of the three-dimensional (3D) distribution of the electron density of the global solar corona. During its lifetime…
Solar Radio-Burst Forecast Based on a Convolutional Neural Network
Feng, S. W.; Ma, Q.; Du, Q. F. +3 more
A solar radio burst is the enhancement of radio emission during the release of solar magnetic energy. It is an important indicator of the level of solar activity. In this paper, we propose a solar radio-burst forecast model that takes the Solar and Heliospheric Observatory (SOHO)/Michelson Doppler Imager (MDI) full-disk solar magnetograms as input…
A Statistical Comparison of EUV Brightenings Observed by SO/EUI with Simulated Brightenings in Nonpotential Simulations
Harra, Louise K.; Barczynski, Krzysztof; Berghmans, David +3 more
The High Resolution Imager (HRIEUV) telescope of the Extreme Ultraviolet Imager (EUI) instrument onboard Solar Orbiter has observed EUV brightenings, so-called campfires, as fine-scale structures at coronal temperatures. The goal of this paper is to compare the basic geometrical (size, orientation) and physical (intensity, lifetime) pro…
The State of the White-Light Corona over the Minimum and Ascending Phases of Solar Cycle 25 - Comparison with Past Cycles
Lamy, Philippe; Gilardy, Hugo
We report on the state of the corona over the minimum and ascending phases of Solar Cycle (SC) 25 on the basis of the temporal evolutions of its radiance and of the properties of coronal mass ejections (CMEs), as determined from white-light observations performed by the SOHO/LASCO-C2 coronagraph. These evolutions are further compared with those de…
Dynamics of Explosive Events Observed by the Interface Region Imaging Spectrograph
Tavabi, E.; Zeighami, S.; Heydari, M.
In this research, we investigate Explosive Events (EEs) in the off-limb solar atmosphere, with simultaneous observations from the Si IV, Mg II k, and slit-jaw images (SJI) of the Interface Region Imaging Spectrograph (IRIS), on 17 August 2014, and 19 February. IRIS data can be investigated to observe the motion of matter, fluctuations, energy abso…