Results 61 to 70 of about 6,703 (158)

Contemporaneous XMM-Newton investigation of a giant X-ray flare and quiescent state from a cool M-class dwarf in the local cavity

, 2011
We report the serendipitous detection of a giant X-ray flare from the source 2XMM J043527.2-144301 during an XMM-Newton observation of the high latitude molecular cloud MBM20. The source has not been previously studied at any wavelength.
A. Gupta, B. Williams, Berger, Dahn, Fleming, Galeazzi, Galeazzi, Gizis, Gupta, Hearty, Laycock, Legget, M. Galeazzi, Pallavicini, Pallavicini, Reale, Singh, Smith, Wargelin   +18 more
core   +1 more source

Summertime Carbonaceous Aerosol in Interior Versus Coastal Northern Alaska

Journal of Geophysical Research: Atmospheres, Volume 130, Issue 8, 28 April 2025.
Abstract Rapid warming is likely increasing primary production and wildfire occurrence in the Arctic. Projected changes in carbonaceous aerosols during the summer will impact atmospheric chemistry and climate, but our understanding of these processes is limited by sparse observations.
Allison M. Welch, Tate Matthews, Rebecca J. Sheesley, Hui Wang, Kelley C. Barsanti, Nicole Nielsen, Xiaomei Xu, Lurui Niu, Alex B. Guenther, Claudia I. Czimczik   +9 more
wiley   +1 more source

Detecting and Classifying Flares in High-resolution Solar Spectra with Supervised Machine Learning

The Astrophysical Journal
Flares are a well-studied aspect of the Sun’s magnetic activity. Detecting and classifying solar flares can inform the analysis of contamination caused by stellar flares in exoplanet transmission spectra.
Nicole Hao, Laura Flagg, Ray Jayawardhana   +2 more
doaj   +1 more source

A Unified Computational Model for Solar and Stellar Flares

, 2015
We present a unified computational framework which can be used to describe impulsive flares on the Sun and on dMe stars. The models assume that the flare impulsive phase is caused by a beam of charged particles that is accelerated in the corona and ...
Allred, Joel C., Carlsson, Mats, Kowalski, Adam F.   +2 more
core   +1 more source

Multimodal signalling in manakins: lack of correlated evolution between acoustic, visual and behavioural traits

Ibis, Volume 167, Issue 2, Page 481-497, April 2025.
Sexual traits, such as visual adornments, sound‐based cues and courtship dances, are frequently displayed in combination as multimodal signals. Some hypotheses propose that different signals trade‐off with each other, potentially due to resource limitations (‘trade‐off’ or transfer hypothesis) or that these develop simultaneously to enhance ...
Sonia Ariznavarreta, Alba Martín del Campo, Vicente García‐Navas   +2 more
wiley   +1 more source

Flare And Starspot-Induced Variabilities Of Red Dwarf Stars In The Open Cluster M37: Photometric Study On Stellar Magnetic Activity

, 2016
We investigate the statistical properties of flare and starspot-induced variabilities of red dwarf stars in the open cluster M37, particularly (1) understanding magnetic activity phenomena that are seen in groups of stars (with the same age and mass) and (2) the correlations among activity indicators.
Chang, Seo-Won, Byun, Yong-Ik, Hartman, Joel D.   +2 more
openaire   +1 more source

The Yenisei Makes the Weather: The Microclimate of the Krasnoyarsk Dam and Its Research, 1960s–1990s

The Russian Review, Volume 84, Issue 2, Page 249-266, April 2025.
Abstract When Soviet authorities began building the Krasnoyarsk Dam in 1956, the Yenisei River had an ice‐free period of only 112 days a year. The thick and long‐lasting ice impeded dam building and navigation. However, as the dam rose, it produced an environmental anomaly; for more than 200 kilometers downstream, the Yenisei became ice‐free year‐round.
Mariia Koskina
wiley   +1 more source

Quiescent Radio Emission from Southern Late-type M Dwarfs and a Spectacular Radio Flare from the M8 Dwarf DENIS 1048-3956

, 2005
We report the results of a radio monitoring program conducted at the Australia Telescope Compact Array to search for quiescent and flaring emission from seven nearby Southern late-type M and L dwarfs.
Adam J. Burgasser, Altshuler D. R., Benz A. O., Benz A. O., Benz A. O., Bouvier J., Burke B. F., Chabrier G., Epchtein N., Goldman B., Leto G., Mary E. Putman, Meyer F., Neuhauser R., Radler K.-H., Razin V. A., Reid I. N., Tinney C. G., Tsytovich V. N.   +18 more
core   +1 more source

HRC-I/Chandra X-ray observations towards sigma Orionis

, 2010
Aims: We investigated the X-ray emission from young stars and brown dwarfs in the sigma Orionis cluster (tau~3 Ma, d~385 pc) and its relation to mass, presence of circumstellar discs, and separation to the cluster centre by taking advantage of the superb
Albacete-Colombo, Albacete-Colombo, Anders, Andrews, Barrado y Navascués, Barrado y Navascués, Bihain, Bolton, Bouy, Broos, Burningham, Béjar, Béjar, Béjar, Caballero, Caballero, Caballero, Caballero, Caballero, Caballero, Caballero, Caballero, Caballero, Caballero, Caballero, Caballero, Caballero, Catalano, Condon, Daemgen, Damiani, Damiani, Della Ceca, Drake, Epchtein, Feigelson, Feigelson, Flaccomio, Franciosini, Frost, Garrison, Gatti, Getman, González Hernández, Groote, Güdel, Hernández, Hodapp, J. A. Caballero, J. F. Albacete-Colombo, J. López-Santiago, Jeffries, Joncas, Kenyon, Kudritzki, Lee, Lucy, Luhman, López-Santiago, Maggio, Maxted, Mayne, Micela, Mohanty, Monet, Moran, Morrison, Muzerolle, Naylor, Neuhäuser, North, Oliveira, Owocki, Preibisch, Randich, Reid, Reipurth, Sacco, Sacco, Sanz-Forcada, Scholz, Sherry, Sherry, Skinner, Skrutskie, Smith, Stauffer, Stelzer, Stelzer, Stern, Telleschi, Townsend, van Loon, Walborn, Wolk, Zapatero Osorio, Zapatero Osorio, Zapatero Osorio   +97 more
core   +1 more source

Reaffirming the connection between the Galactic stellar warp and the Canis Major overdensity

, 2007
We perform a critical re-analysis and discussion of recent results presented in the literature which interpret the CMa overdensity as the signature of an accreting dwarf galaxy or a new substructure within the Galaxy. Several issues are addressed.
A. Cabrera-Lavers, Bellazzini, Bellazzini, Bellazzini, Butler, Carraro, Carraro, Conn, de Jong, Hammer, López-Corredoira, López-Corredoira, M. López-Corredoira, Martin, Moitinho, Momany, Momany, Peñarrubia, Robin, Rocha-Pinto, S. Zaggia, Sbordone, Schlegel, Y. Momany   +23 more
core   +1 more source