Results 71 to 80 of about 137 (115)

Every Data Point Counts: Stellar Flares as a Case Study of Atmosphere-aided Studies of Transients in the LSST Era

The Astrophysical Journal Supplement Series
Due to their short timescale, stellar flares are a challenging target for the most modern synoptic sky surveys. The upcoming Vera C. Rubin Legacy Survey of Space and Time (LSST), a project designed to collect more data than any precursor survey, is ...
Riley W. Clarke, James R. A. Davenport, John Gizis, Melissa L. Graham, Xiaolong Li, Willow Fortino, Easton J. Honaker, Ian Sullivan, Yusra Alsayyad, James Bosch, Robert A. Knop, Federica B. Bianco   +11 more
doaj   +1 more source

Response of Ionospheric Total Electron Content to the Impulsive and Late Phases of X‐Class Solar Flares With Various Center‐to‐Limb Locations

Journal of Geophysical Research: Space Physics, Volume 130, Issue 10, October 2025.
Abstract During a solar flare, the fluxes in various lines and continua of the solar spectrum increase, leading to enhanced ionization of the illuminated part of the Earth's ionosphere and an increase in the total electron content (TEC $TEC$). It has been previously shown that nearly 50% of X‐class solar flares exhibit a second peak in warm coronal ...
S. Z. Bekker, R. O. Milligan, I. A. Ryakhovsky   +2 more
wiley   +1 more source

Leveraging Whole Genomes, Mitochondrial DNA and Haploblocks to Decipher Complex Demographic Histories: An Example From a Broadly Admixed Arctic Fish

Molecular Ecology, Volume 34, Issue 10, May 2025.
ABSTRACT The study of phylogeography has transitioned from mitochondrial haplotypes to genome‐wide analyses, borrowing from population genomics methods along the way. Whole‐genome sequencing allows the study of both mitochondrial and nuclear DNA and provides the density of markers to investigate recombination along the genome.
Xavier Dallaire, Eric Normandeau, Thomas Brazier, Les Harris, Michael M. Hansen, Claire Mérot, Jean‐Sébastien Moore   +6 more
wiley   +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

Role of Nonthermal Processes in the Quiescent and Active Millimeter Spectrum of a Young M Dwarf

The Astrophysical Journal
Millimeter (mm) emission from F-M dwarfs (cool stars) primarily traces chromospheric activity, with thermal emission thought to dominate in quiescence. Despite the high chromospheric activity, the quiescent mm spectral fluence (mm- S ( ν )) of young (1 ...
Atul Mohan, Peter H. Hauschildt, Birgit Fuhrmeister, Surajit Mondal, Vladimir Airapetian, Sven Wedemeyer   +5 more
doaj   +1 more source

Red Stars, Green Planets: Evaluating Planetary Habitability in Light of M-Dwarf Superflares

M-dwarf stars frequently emit high-energy flares; superflares, with energies of at least $10^{33}$ erg, are not uncommon. Repeated superflares can render planets uninhabitable, but at the same time, M-dwarfs do not emit the ultraviolet radiation that ...
Glazier, Amy
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

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

Flares on active M-type stars observed with XMM-Newton and Chandra.

, 2007
M-type red dwarfs are among the most active stars. Their light curves display random variability of rapid increase and gradual decrease in emission.
Kraev, U.M., Mitra Kraev, Urmila
core  

The CARMENES search for exoplanets around M dwarfs. The He I triplet at 10830 Å across the M dwarf sequence

, 2019
© ESO 2019. Artículo firmado por 27 autores. B.F. acknowledges funding by the DFG under Schm 1032/69-1. CARMENES is an instrument for the Centro Astronómico HispanoAlemán de Calar Alto (CAHA, Almería, Spain).
Montes Gutiérrez, David, Cortés Contreras, Miriam, Caballero, J. A., Sanz Forcada, J.   +3 more
core   +1 more source