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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…
Magnetic Imprints of Eruptive and Noneruptive Solar Flares as Observed by Solar Dynamics Observatory
Ravindra, B.; Doddamani, V. H.; Vemareddy, P. +1 more
The abrupt and permanent changes of the photospheric magnetic field in the localized regions of active regions during solar flares, called magnetic imprints (MIs), have been observed for nearly the past three decades. The well-known coronal implosion model is assumed to explain such flare-associated changes but the complete physical understanding …
A Publicly Available Multiobservatory Data Set of an Enhanced Network Patch from the Photosphere to the Corona
Warren, Harry P.; Savage, Sabrina; Kobelski, Adam R. +3 more
New instruments sensitive to chromospheric radiation at X-ray, UV, visible, IR, and submillimeter wavelengths have become available that significantly enhance our ability to understand the bidirectional flow of energy through the chromosphere. We describe the calibration, coalignment, initial results, and public release of a new data set combining…
Study of Mars Magnetosheath Fluctuations using the Kurtosis Technique: Mars Express Observations
Fraenz, M.; Bolzan, M. J. A.; Echer, E. +1 more
Reconstructing AGN X-ray spectral parameter distributions with Bayesian methods. II. Population inference
Paltani, Stéphane; Salvato, Mara; Eckert, Dominique +1 more
We present a new Bayesian method for reconstructing the parent distributions of X-ray spectral parameters of active galactic nuclei (AGN) in large surveys. The method uses the probability distribution function (PDF) of posteriors obtained by fitting a consistent physical model to each object with a Bayesian method. The PDFs are often broadly distr…
Herschel discovery of far-infrared emission from the hotspot D in the radio galaxy Cygnus A
Isobe, Naoki; Tashiro, Makoto S.; Sunada, Yuji +3 more
The far-infrared counterpart of hotspot D, the terminal hotspot of the eastern jet hosted by the radio galaxy Cygnus A, is detected with Herschel Aperture photometry of the source performed in 5 photometric bands covering the wavelength range of 70-350 $\mu$m. After removing the contamination from another nearby hotspot, E, the far-infrared intens…
Fast prograde coronal flows in solar active regions
Chamberlin, Phillip C.; Fletcher, Lyndsay; Mulay, Sargam M. +6 more
We report the discovery and characterization of high-speed (>100 km s-1) horizontal flows in solar active regions, making use of the Sun-as-a-star spectroscopy in the range 5-105 nm provided by the EVE (Extreme Ultraviolet Variability Experiment) spectrometers on the Solar Dynamics Observatory. These apparent flows are persistent on …
Toward Understanding the B[e] Phenomenon. IX. Nature and Binarity of MWC645
Miroshnichenko, A. S.; Manset, N.; Zharikov, S. V. +14 more
We present the results of optical and near-IR spectroscopy and multicolor photometry of the emission-line star MWC 645, which exhibits the B[e] phenomenon. The presence of positionally variable absorption lines of a cool star detected for the first time indicates that the object is a binary system. Using a combination of the photometric and spectr…
Chandra revisits WR 48a: testing colliding wind models in massive binaries
Skinner, Stephen L.; Zhekov, Svetozar A.; Gagné, Marc
We present results of new Chandra High-Energy Transmission Grating (HETG) observations (2019 November-December) of the massive Wolf-Rayet binary WR 48a. Analysis of these high-quality data showed that the spectral lines in this massive binary are broadened (full width at half-maximum, FWHM = 1400 km s-1) and marginally blueshifted (~-10…
Subpixel-Scale Topography Retrieval of Mars Using Single-Image DTM Estimation and Super-Resolution Restoration
Tao, Yu; Michael, Greg; Muller, Jan-Peter +5 more
We propose using coupled deep learning based super-resolution restoration (SRR) and single-image digital terrain model (DTM) estimation (SDE) methods to produce subpixel-scale topography from single-view ESA Trace Gas Orbiter Colour and Stereo Surface Imaging System (CaSSIS) and NASA Mars Reconnaissance Orbiter High Resolution Imaging Science Expe…