Radiation – Page 4 – My WordPress Site

This illustration shows a red dwarf star orbited by a hypothetical exoplanet. -- NASA source

Exoplanets, -moons, -comets, Habitable Zones, Radiation, Space Weather & Heliophysics

Habitability Of Exoplanets Orbiting Flaring Stars

by Keith CowingDecember 29, 2025December 29, 2025

Inouye Solar Telescope image of a solar flare on August 8, 2024. (Image credit: NSF/NSO/AURA, CC-BY)

Atmospheres, Climate, Weather, Exoplanets, -moons, -comets, Habitable Zones, Imaging & Spectroscopy, Radiation, Space Weather & Heliophysics, Stellar Cartography

Transients As Determinants Of Habitability

by Keith CowingDecember 19, 2025December 19, 2025

The lines of defence that cyanobacteria use against UVR. EPS—exopolysaccharides, CAT—catalase, SOD—superoxide dismutase, GR—glutathione reductase, Car—carotenoids, MAAs—mycosporine-like amino acids, and Scy—scytonemin. -- International Journal of Molecular Sciences

Biophysics, Biosignatures & Paleobiology, Extremeophiles and Extreme Environments, Microbiology & Virology, Panspermia, Radiation

Cyanobacteria Under UV Radiation: General Insights Into Stress Responses

by Keith CowingDecember 18, 2025December 18, 2025

This illustration shows Jezero Crater — the landing site of the Mars 2020 Perseverance rover. -- NASA.gov

Atmospheres, Climate, Weather, Biophysics, Biosignatures & Paleobiology, Desert Worlds, Habitable Zones, Icy Worlds, Mars, Microbiology & Virology, Origin & Evolution of Life, Radiation

Modeling Photoprotection of Ultraviolet C Radiation by Ferric Ions and Implications for the Habitability of Ancient Martian Lakes

by Keith CowingDecember 10, 2025December 10, 2025

Surface flux density observed and modelled. The m2F12-37-2.5 (dark green) and cF13-500-3 (light green) stellar atmosphere models are plotted at coefficients Xˆ 1=1 and Xˆ 2 = 1 (the theoretical assumption of the entire stellar surface exhibiting flaring activity). For AU Mic during a flare, the red solid and orange dashed lines show the fitted model spectrum at flare maximum using coefficients from the example fit (the flare data are stated in Table A.1 in Appendix A.2). The inverse H6 model at flare maximum, pre-flare and the ‘fiducial flare’ model from Loyd et al. (2018a) with a comparable ED is plotted as blue dash-dotted, light blue dashed, and purple dashed lines, respectively. Blackbody curves for 3850 K, 6000 K, 8000 K, and 10,000 K are included in black solid, dotted, dash-dotted and dashed lines. The panchromatic AU Mic flux from Feinstein et al. (2022) is plotted in light grey. Insets highlight the FUV (lower left) and TESS (lower right) wavelength ranges. -- astro-ph.SR

Atmospheres, Climate, Weather, Biogeochemical Cycles & Geobiology, Exoplanets, -moons, -comets, Gaia - Planetary Perspectives, Radiation, Space Weather & Heliophysics

Young M Dwarfs Flare Activity Model: Towards Better Exoplanetary Atmospheric Characterisation

by Keith CowingDecember 8, 2025December 8, 2025

Scientists have captured the first detailed observations of how a superstorm compresses Earth’s plasmasphere and reveal why recovery took more than four days, affecting navigation and communication systems. CREDIT Institute for Space-Earth Environmental Research (ISEE), Nagoya University

Atmospheres, Climate, Weather, Habitable Zones, Magnetic Fields, Electromagnetism, bioelectricity,, Radiation, Space Weather & Heliophysics

How Superstorm Gannon Squeezed Earth’s Plasmasphere To One-fifth Its Size

by Keith CowingNovember 21, 2025November 21, 2025

W. M. Keck Institute for Space Studies

Atmospheres, Climate, Weather, Biogeochemical Cycles & Geobiology, Habitable Zones, Intelligence & Language, Magnetic Fields, Electromagnetism, bioelectricity,, Radiation, Space Weather & Heliophysics

The Exospace Weather Frontier

by Keith CowingNovember 17, 2025

This artist’s impression shows a coronal mass ejection (CME) around another star. We see these eruptions coming often from the Sun. During a CME, massive amounts of material are flung out from our star, flooding the surrounding space. These dramatic expulsions shape and drive space weather, such as the dazzling auroras we see on Earth, and can chip away at the atmospheres of any nearby planets. -- ESA larger image

Atmospheres, Climate, Weather, Biogeochemical Cycles & Geobiology, Exoplanets, -moons, -comets, Habitable Zones, Radiation, Space Weather & Heliophysics

First Confirmed Sighting Of Explosive Burst On Nearby Star

by Keith CowingNovember 13, 2025November 13, 2025

This illustration shows a red dwarf star orbited by a hypothetical exoplanet. Red dwarfs tend to be magnetically active, displaying gigantic arcing prominences and a wealth of dark sunspots. Red dwarfs also erupt with intense flares that could strip a nearby planet’s atmosphere. -- NASA

AI - Data - Apps - Cybernetics, Astronomy & Telescopes, Exoplanets, -moons, -comets, Habitable Zones, Radiation, Space Weather & Heliophysics

The Largest Ground-based Catalogue Of M-dwarf Flares

by Keith CowingOctober 30, 2025October 30, 2025

Artist's depiction of a coronal mass ejection from EK Draconis. The hotter and faster ejection is shown in blue, while the cooler and slower ejection is shown in red. Credit NAOJ

Habitable Zones, Origin & Evolution of Life, Radiation, Space Weather & Heliophysics

Coronal Mass Ejections At The Dawn Of The Solar System

by Keith CowingOctober 28, 2025October 28, 2025