Radiation – Page 5 – My WordPress Site

The magnetopause standoff distance of a planet orbiting our stellar sample. The theoretical decay of the Parker model (blue) and that measured in the solar system (red) are used in the estimations for Case 1 (left panels) and for Case 3, fast wind (right panels). In the upper (bottom) panels the planet is orbiting the outer (inner) radius of the HZ. The gray dashed line represents Earth’s early magnetosphere. The results of Vidotto et al. (2013) were added for comparison. -- astro-ph.SR

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

The Impact Of Stellar Winds And Tidal Locking Effects On The Habitability Of Earth-like Exoplanets Around M Dwarf Stars

by Keith CowingOctober 28, 2025October 28, 2025

Schematic diagram of the AQUILA chamber. Science Direct

Astrochemistry, Astrogeology, Enceladus, Icy Worlds, Imaging & Spectroscopy, Radiation, Saturn

Water-group Ion Irradiation Studies Of Enceladus Ice Analogues: Can Radiolysis Account For Material In And Around The South Polar Plume?

by Keith CowingOctober 27, 2025October 27, 2025

Cumulative flare frequency distribution for M dwarfs plotted as a function of flare energy across spectral types. The red dashed line shows the power-law fit (see Section 3.4). For the M6–M6.5 sample, no fit is shown due to the limited number of flares. -- astro-ph.SR

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

Exploring Stellar Activity In A Sample Of Active M Dwarfs

by Keith CowingOctober 14, 2025October 14, 2025

MGS-1 Mars Global Simulant -- University of Central Florida

Biochemistry & Organic Chemistry, Biogeochemical Cycles & Geobiology, Biosignatures & Paleobiology, Mars, Microbiology & Virology, Origin & Evolution of Life, Panspermia, Planetary Protection & Biosafety, Radiation, Sample Return

Endospore Integrity And Viability Of Bacillus subtilis On Simulated Martian Regolith In Rotational UVC Radiation Exposures

by Keith CowingOctober 11, 2025October 11, 2025

Integrated energy flux from SWMF electron precipitation in the northern hemisphere during positive stellar magnetic field Bz and low By period with high proton density, dynamic pressure, and stellar wind speed. -- astro-ph.EP

Fossils & Paleontology, Habitable Zones, Mars, Radiation, Space Weather & Heliophysics, Venus

Extreme Geomagnetic Storm On Early Earth Induced by Corotating Interaction Regions from the Young Sun

by Keith CowingOctober 2, 2025

Formic acid, HCOOH -- Wikipedia

Astrochemistry, Astronomy & Telescopes, Biochemistry & Organic Chemistry, Biophysics, Biosignatures & Paleobiology, Icy Worlds, Imaging & Spectroscopy, Interstellar, Radiation

X-ray Photodesorption Of Complex Organic Molecules In Protoplanetary Disks

by Keith CowingSeptember 23, 2025September 23, 2025

Under simulated Mars-like conditions, black fungus shows how life could endure harsh extraterrestrial environments. © 2025 KAUST.

Analog Studies, Arctic / Antarctic / Alpine, Biosignatures & Paleobiology, Cryobiology, Desert Worlds, Extremeophiles and Extreme Environments, Habitable Zones, Mars, Microbiology & Virology, Radiation

Super Fungi Survive Extreme Mars-like Environments

by Keith CowingAugust 27, 2025August 27, 2025

NASA’s Solar Dynamics Observatory captured this image of an X1.5 solar flare peaking at 7:44 am EDT on May 11, 2024. The image shows a subset of extreme ultraviolet light that highlights the extremely hot material in flares created from a mixture of SDO’s AIA 193, 171 and 131 channels. -- larger image NASA

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

As Earth’s Atmosphere Changes, So Will Its Response To Geomagnetic Storms

by Keith CowingAugust 17, 2025

Stellar flares observed in JWST/NIRISS time-series spectroscopy of TRAPPIST-1. Each column shows one flare event during transits of the TRAPPIST-1c or TRAPPIST-1f planets. Tow row: Light curves with the total flux (integrated over the full spectral range and normalized to the mean out-of-transit flux). Colored points indicate pre-flare (green), flare (orange), maximum flare light (red), and post-flare (blue) phases. Green and blue dashed lines mark the average pre- and post-flare flux levels. Middle row: Light curves of the normalized Hα flux. Bottom row: Time-resolved spectrograms (wavelength vs. time) normalized to the pre-flare spectrum. The shaded blue region shows the drop in flux caused by the planetary transit. For comparison, the time axis in all panels are aligned such that t = 0 corresponds to the beginning of the maximum flare light phase. In all four events, the total flux in the post-flare phase is systematically elevated relative to the pre-flare level. -- astro-ph.EP

Astronomy & Telescopes, Exoplanets, -moons, -comets, Habitable Zones, Imaging & Spectroscopy, Magnetic Fields, Electromagnetism, bioelectricity,, Radiation, Space Weather & Heliophysics, TRAPPIST-1

Flares On TRAPPIST-1 Reveal The Spectrum Of Magnetic Features On Its Surface

by Keith CowingAugust 8, 2025August 8, 2025

(a) Equatorial section of ur and (b) azimuthal section of uϕ showing a typical flow pattern for the metallic core-silicate magma ocean system for the default model D. -- astro-ph.EP

Astrogeology, Exoplanets, -moons, -comets, Habitable Zones, Magnetic Fields, Electromagnetism, bioelectricity,, Radiation

Can A Convecting Magma Ocean Offer A Solution To The Puzzling Case Of Core Convection In Early Earth?

by Keith CowingAugust 2, 2025