A5089411259- Solar and Space Plasma Dynamics
- Stellar, planetary, and galactic studies
- Solar Radiation and Photovoltaics
- Astro and Planetary Science
- Ionosphere and magnetosphere dynamics
- Climate variability and models
- Geomagnetism and Paleomagnetism Studies
- Gamma-ray bursts and supernovae
- Particle Detector Development and Performance
- Seismic Imaging and Inversion Techniques
- Astronomy and Astrophysical Research
Queen's University Belfast
2020-2023
Abstract The Astropy Project supports and fosters the development of open-source openly developed Python packages that provide commonly needed functionality to astronomical community. A key element is core package astropy , which serves as foundation for more specialized projects packages. In this article, we summarize features in recent major release, version 5.0, updates on Project. We then discuss supporting a broader ecosystem interoperable packages, including connections with several...
Although theoretically predicted, the simultaneous excitation of several resonant modes in sunspots has not been observed. Like any harmonic oscillator, a solar magnetic flux tube can support variety resonances, which constitute natural response system to external forcing. Apart from few single low order eigenmodes small scale structures, were found extremely large sunspots. Here we report detection largest-scale coherent oscillations observed sunspot, with spectrum significantly different...
Abstract Solar pores are efficient magnetic conduits for propagating magnetohydrodynamic wave energy into the outer regions of solar atmosphere. Pore observations often contain isolated and/or unconnected structures, preventing statistical examination activity as a function atmospheric height. Here, using high-resolution acquired by Dunn Telescope, we examine photospheric and chromospheric signatures from unique collection originating same decaying sunspot. Wavelet analysis high-cadence...
Abstract Through their lifetime, sunspots undergo a change in area and shape and, as they decay, fragment into smaller structures. Here, for the first time we analyze spatial structure of magnetohydrodynamic (MHD) slow-body fast-surface modes observed umbrae cross-sectional changes. The proper orthogonal decomposition (POD) dynamic mode (DMD) techniques were used to 3 6 hr Solar Dynamics Observatory/Helioseismic Magnetic Imager series Doppler velocities at photospheric level approximately...
Determining accurate plasma Doppler (line-of-sight) velocities from spectroscopic measurements is a challenging endeavour, especially when weak chromospheric absorption lines are often rapidly evolving and, hence, contain multiple spectral components in their constituent line profiles. Here, we present novel method that employs machine learning techniques to identify the underlying within observed lines, before subsequently constraining profiles through single or Voigt fits. Our allows...
The instrumental advances made in this new era of 4-meter class solar telescopes with unmatched spectropolarimetric accuracy and sensitivity, will enable the study chromospheric magnetic fields their dynamics unprecedented detail. In regard, diagnostics can provide invaluable insight into magneto-hydrodynamic (MHD) wave processes. MHD waves and, particular, Alfv\'enic fluctuations associated to particular modes, were recently recognized as important mechanisms not only for heating outer...
Magnetohydrodynamic (MHD) simulations of the solar atmosphere are often performed under assumption that plasma is fully ionized. However, in lower a reduced temperature results only partial ionization plasma. The interaction between decoupled neutral and ionized components such partially produces ambipolar diffusion. To investigate role diffusion propagating wave characteristics photosphere chromosphere, we employ Mancha3D numerical code to model magnetoacoustic waves through immediately...
Determining accurate velocity measurements from observations of the Sun is vital importance to solar physicists who are studying wave dynamics in atmosphere. Weak chromospheric absorption lines, due dynamic events atmosphere, often consist multiple spectral components. Isolating these components allows for field and quiescent regimes be studied independently. However, isolating such particularly challenging wide variety shapes present same dataset. MCALF provides a novel method...
Through their lifetime sunspots undergo a change in area and shape and, as they decay, fragment into smaller structures. Here, for the first time we analyze spatial structure of magnetohydrodynamic (MHD) slow body fast surface modes observed umbrae cross-sectional changes. The Proper Orthogonal Decomposition (POD) Dynamic Mode (DMD) techniques were used to 3 6 hours SDO/HMI series Doppler velocities at photospheric level approximately circular elliptically shaped sunspots. Each divided...
Magnetohydrodynamic (MHD) simulations of the solar atmosphere are often performed under assumption that plasma is fully ionized. However, in lower a reduced temperature results only partial ionization plasma. The interaction between decoupled neutral and ionized components such partially produces ambipolar diffusion. To investigate role diffusion propagating wave characteristics photosphere chromosphere, we employ Mancha3D numerical code to model magnetoacoustic waves through immediately...