Browsing by Author "GALLAGHER, PETER"
Now showing items 1-19 of 19
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The association of a J -burst with a solar jet
GALLAGHER, PETER; Morosan, D.E.; Fallows, R.A.; Reid, H.; Mann, G.; Bisi, M.M.; Magdalenić, J; Rucker, H.O.; Thidé, B.; Vocks, C.; Anderson, J.; Asgekar, A.; Avruch, I.M.; Bell, M.E.; Bentum, M.J.; Best, P.; Blaauw, R.; Bonafede, A.; Breitling, F.; Broderick, J.W.; Brüggen, M.; Cerrigone, L.; Ciardi, B.; de Geus, E.; Duscha, S.; Eislöffel, J.; Falcke, H.; Garett, M.A.; Grießmeier, J.M.; Gunst, A.W.; Hoeft, M.; Iacobelli, M.; Juette, E.; Kuper, G.; McFadden, R.; McKay-Bukowski, D.; McKean, J.P.; Mulcahy, D.D.; Munk, H.; Nelles, A.; Orru, E.; Paas, H.; Pandey-Pommier, M.; Pandey, V.N.; Pizzo, R.; Polatidis, A.G.; Reich, W.; Schwarz, D.J.; Sluman, J.; Smirnov, O.; Steinmetz, M.; Tagger, M.; ter Veen, S.; Thoudam, S.; Toribio, M.C.; Vermeulen, R.; van Weeren, R.J.; Wucknitz, O.; Zarka, P. (2017)Context. The Sun is an active star that produces large-scale energetic events such as solar flares and coronal mass ejections, and numerous smaller scale events such as solar jets. These events are often associated with ... -
Characterising Complexity in Solar Magnetogram Data using a Wavelet-based Segmentation Method
GALLAGHER, PETER; CONLON, PAUL ANTHONY; MCATEER, ROBERT (2010)The multifractal nature of solar photospheric magnetic structures are studied using the 2D wavelet transform modulus maxima (WTMM) method. This relies on computing partition functions from the wavelet transform skeleton ... -
Constraining Three-Dimensional Magnetic Field Extrapolations Using the Twin Perspectives of STEREO
GALLAGHER, PETER; CONLON, PAUL ANTHONY (2010)The three-dimensional magnetic topology of a solar active region (NOAA 10956) was reconstructed using a linear force-free field extrapolation constrained using the twin perspectives of STEREO. A set of coronal field ... -
Coronal Mass Ejection Detection using Wavelets, Curvelets and Ridgelets: Applications for Space Weather Monitoring
GALLAGHER, PETER; MCATEER, ROBERT; BYRNE, JASON (2011)Coronal mass ejections (CMEs) are large-scale eruptions of plasma and magnetic field that can produce adverse space weather at Earth and other locations in the Heliosphere. Due to the intrinsic multiscale nature of features ... -
Deceleration and dispersion of large-scale coronal bright fronts
GALLAGHER, PETER; LONG, DAVID; BLOOMFIELD, SHAUN (2011)Abstract: Context. One of the most dramatic manifestations of solar activity are large-scale coronal bright fronts (CBFs) observed in extreme ultraviolet (EUV) images of the solar atmosphere. To date, the energetics and ... -
Flare forecasting using the evolution of McIntosh sunspot classifications
GALLAGHER, PETER (2018) -
Functional Diversification of the Twin-Arginine Translocation Pathway Mediates the Emergence of Novel Ecological Adaptations
FARES, MARIO; JIANG, XIAOWEI; GALLAGHER, PETER (2011)Microorganisms occupy a myriad of ecological niches that show an astonishing diversity. The molecular mechanisms underlying microbes? ecological diversity remain a fundamental conundrum in evolutionary biology. Evidence ... -
Improved methods for determining the kinematics of coronal mass ejections and coronal waves
GALLAGHER, PETER; BLOOMFIELD, SHAUN (2013) -
The kinematics of coronal mass ejections using multiscale methods
GALLAGHER, PETER; BYRNE, JASON; MCATEER, ROBERT (2009)Aims. The diffuse morphology and transient nature of coronal mass ejections (CMEs) make them difficult to identify and track using traditional image processing techniques. We apply multiscale methods to enhance the visibility ... -
Large-scale Bright Fronts in the Solar Corona: A Review of "EIT waves"
GALLAGHER, PETER (2010)?EIT waves? are large-scale coronal bright fronts (CBFs) that were first observed in 195 ? images obtained using the Extreme-ultraviolet Imaging Telescope (EIT) onboard the Solar and Heliospheric Observatory (SOHO). Commonly ... -
LEMUR: Large European module for solar Ultraviolet Research: European contribution to JAXA's Solar-C mission
GALLAGHER, PETER (2012)The solar outer atmosphere is an extremely dynamic environment characterized by the continuous interplay between the plasma and the magnetic field that generates and permeates it. Such interactions play a fundamental role ... -
LOFAR observations of the quiet solar corona
GALLAGHER, PETER; Vocks, C.; Mann, G.; Breitling, F.; Bisi, M.M.; Dabrowski, B.; Fallows, R.; Krankowski, A.; Magdalenić, J.; Marqué, C.; Morosan, D.; Rucker, H. (2018)Context. The quiet solar corona emits meter-wave thermal bremsstrahlung. Coronal radio emission can only propagate above that radius, Rω, where the local plasma frequency equals the observing frequency. The radio interferometer ... -
QUANTIFYING THE EVOLVING MAGNETIC STRUCTURE OF ACTIVE REGIONS
GALLAGHER, PETER; MCATEER, ROBERT; CONLON, PAUL ANTHONY (2010)The topical and controversial issue of parameterizing the magnetic structure of solar active regions has vital implications in the understanding of how these structures form, evolve, produce solar flares, and decay. This ... -
Solar flare X-ray source motion as a response to electron spectral hardening
GALLAGHER, PETER (2013) -
The SWAP EUV Imaging Telescope Part I: Instrument Overview and Pre-Flight Testing
GALLAGHER, PETER; BLOOMFIELD, SHAUN (2013)The Sun Watcher with Active Pixels and Image Processing (SWAP) is an EUV solar telescope on board ESA?s Project for Onboard Autonomy 2 (PROBA2) mission launched on 2 November 2009. SWAP has a spectral band- pass centered ... -
The thermal properties of solar flares over three solar cycles using GOES X-ray observations
GALLAGHER, PETER (2012)Solar flare X-ray emission results from rapidly increasing temperatures and emission measures in flaring active region loops. To date, observations from the X-Ray Sensor (XRS) onboard the Geo- stationary Operational ... -
Tracking of an electron beam through the solar corona with LOFAR
GALLAGHER, PETER; Mann, G.; Breitling, F.; Vocks, C.; Aurass, H.; Steinmetz, M.; Strassmeier, K.G.; Bisi, M.M.; Fallows, R.A.; Gallagher, P.; Kerdraon, A.; Mackinnon, A.; Magdalenic, J.; Rucker, H.; Anderson, J.; Asgekar, A.; Avruch, I.M.; Bell, M.E.; Bentum, M.J.; Bernardi, G.; Bonafede, A.; Broderick, J.W.; Brüggen, M.; Butcher, H.R.; Ciardi, B.; Costanje, A.; de Gasperin, F.; de Geus, E.; Deller, A.; Duscha, S. (2018)The Sun’s activity leads to bursts of radio emission, among other phenomena. An example is type-III radio bursts. They occur frequently and appear as short-lived structures rapidly drifting from high to low frequencies in ... -
Understanding the Physical Nature of Coronal "EIT Waves"
GALLAGHER, PETER; Long, D.M.; Bloomfield, D.S.; Chen, P.F.; Downs, C.; Gallagher, P.T.; Kwon, R.-Y.; Vanninathan, K.; Veronig, A.M.; Vourlidas, A.; Vršnak, B.; Warmuth, A.; Žic, T. (2017)For almost 20 years the physical nature of globally propagating waves in the solar corona (commonly called “EIT waves”) has been controversial and subject to debate. Additional theories have been proposed over the years ...