13 Citations
Characteristics of solar X-ray flares and their effects on the ionosphere and human exploration to Mars: MGS radio science observations
- PhysicsIcarus
- 2019
The Unpredictability of the Most Energetic Solar Events
- Physics
- 2007
Observations over the past two solar cycles show a highly irregular pattern of occurrence for major solar flares, γ-ray events, and solar energetic particle (SEP) fluences. Such phenomena do not…
Effects of high-energy astrophysical events on habitable planets
- PhysicsInternational Journal of Astrobiology
- 2012
Abstract With the possible exception of meteor impacts, high-energy astrophysical events such as supernovae, gamma-ray bursts (GRB) and flares are usually not taken into account for biological and…
The habitability of the Milky Way during the active phase of its central supermassive black hole
- PhysicsScientific Reports
- 2017
The extent to which the activity of the supermassive black hole at the center of the Milky Way, known as Sagittarius A* (Sgr A*), may have affected the habitability of Earth-like planets in the authors' Galaxy is quantified.
HDE 245059: A WEAK-LINED T TAURI BINARY REVEALED BY CHANDRA AND KECK
- Physics
- 2009
We present the Chandra High Energy Transmission Grating Spectrometer and Keck observations of HDE 245059, a young weak-lined T Tauri star (WTTS), member of the pre-main-sequence group in the λ…
Effect of nontronite smectite clay on the chemical evolution of several organic molecules under simulated Mars surface UV radiation conditions
- Geology
- 2015
The search for organic carbon-containing molecules at the surface of Mars, as clues of past habitability or remnants of life, is a major scientific goal for Mars exploration. Several lines of…
Effect of nontronite smectite clay on the chemical evolution of several organic molecules under simulated martian surface ultraviolet radiation conditions.
- PhysicsAstrobiology
- 2015
A pronounced photoprotective effect of nontronite on the evolution of glycine and adenine is revealed; their efficiencies of photodecomposition were reduced by a factor of 5 when mixed at a concentration of 2.6 × 10(-2) mol of molecules per gram of nontronsite.
Modeling atmospheric effects of the September 1859 solar flare
- Environmental Science, Physics
- 2006
We have modeled atmospheric effects, especially ozone depletion, due to a solar proton event which probably accompanied the extreme magnetic storm of 1–2 September 1859. We use an inferred proton…
References
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Discovery of X-rays from Mars with Chandra
- Physics
- 2002
On 4 July 2001, X-rays from Mars were detected for the first time. The observation was performed with the ACIS-I detector onboard Chandra and yielded data of high spatial and temporal resolution,…
Nonthermal Flare Emissions
- Physics
- 1999
The dynamic aspects of electron acceleration and transport in the solar atmosphere can be sensitively probed by the radiative signatures, notably hard X-ray bremsstrahlung produced by collisional…
Size dependence of solar X-ray flare properties
- Physics
- 2005
Non-thermal and thermal parameters of 85 solar flares of GOES class B 1 to M6 (background subtracted classes A1 to M6) have been compared to each other. The hard X-ray flux has been measured by…
The Distribution of Flare Parameters and Implications for Coronal Heating
- Physics
- 1993
Assuming that solar hard X-ray flares are caused by bremsstrahlung from a distribution of accelerated electrons impinging on a thick target, we determine the relationship between the total flare…
Importance of Biologically Active Aurora-like Ultraviolet Emission: Stochastic Irradiation of Earth and Mars by Flares and Explosions
- PhysicsOrigins of life and evolution of the biosphere
- 2004
The results suggest that coding organisms on such planets (and on the early Earth) may evolve very differently than on contemporary Earth, with diversity and evolutionary rate controlled by a stochastically varying mutation rate and frequent hypermutation episodes.
Relative Timing and Spectra of Solar Flare Hard X-ray Sources
- Physics
- 2002
Hard X-ray lightcurves, spectrograms, images, and spectra of three medium-sized flares observed by the Reuven Ramaty High-Energy Solar Spectroscopic Imager (RHESSI) are presented. Imaging…
Cosmic Ray and UV Radiation Models on the Ancient Martian Surface
- Physics
- 2001
Abstract The atmospheric evolution on Mars is influenced by nonthermal loss processes of heavy atmospheric constituents. Since Mars does not have an appreciable intrinsic magnetic field at present…
Detection of a long-duration solar gamma-ray flare on June 11, 1991 with EGRET on COMPTON-GRO
- Physics
- 1993
On June 11, 1991, the Energetic Gamma Ray Experiment Telescope (EGRET on the Compton Gamma Ray Observatory (COMPTON) observed high-energy gamma radiation above 30 MeV from the sun following an…
Radiation climate map for analyzing risks to astronauts on the mars surface from galactic cosmic rays
- Physics
- 2004
The potential risks for late effects including cancer, cataracts, and neurological disorders due to exposures to the galactic cosmic rays (GCR) is a large concern for the human exploration of Mars.…