Results 91 to 100 of about 150,775 (261)

Embracing the politics of transformation: Policy action as “battle‐settlement events”

Review of Policy Research, EarlyView.
Abstract Societal transformations for addressing climate change are intensely contested and at risk of resistance and backlash to ambitious policy action. But they are frequently modeled through heuristics such as S‐curves which abstract from such conflicts, assuming increasing returns to scale as a driver of transformations.
James Patterson, Matthew Paterson
wiley   +1 more source

Statistical analysis of short-wave fadeout for extreme space weather event estimation

Earth, Planets and Space, 2020
Solar flares trigger an increase in plasma density in the ionosphere including the D region, and cause the absorption of radio waves, especially in high-frequency (HF) ranges, called short-wave fadeout (SWF).
Chihiro Tao, Michi Nishioka, Susumu Saito, Daikou Shiota, Kyoko Watanabe, Naoto Nishizuka, Takuya Tsugawa, Mamoru Ishii   +7 more
doaj   +1 more source

An overview of solar flare results from COMPTEL [PDF]

, 1994
The COMPTEL experiment on the Compton Gamma Ray Observatory (CGRO) has been operating in orbit since April of 1991. During that time, COMPTEL has observed several large flares, the most notable of which were several X‐class flares which took place in ...
McConnell, Mark L
core   +1 more source

Solar Flares: The Gradual Phase [PDF]

Solar Physics, 1989
AbstractOne has to distinguish between two kinds of the gradual phase of flares: (1) a gradual phase during which no energy is released so that we see only cooling after the impulsive phase (a confined flare), and (2) a gradual phase during which energy release continues (a dynamic flare).The simplest case of (1) is a single-loop flare which might ...
openaire   +2 more sources

A Small Pathbreaking Spacecraft: Giants of Space Research (Bernard Blake, Dieter Hovestadt, and Edward Stone)

Perspectives of Earth and Space Scientists, Volume 6, Issue 1, December 2025.
Abstract The Solar, Anomalous, and Magnetospheric Explorer (SAMPEX) mission launched in July 1992 was the first NASA “Small Explorer” project. It had the goal to show how space missions could be developed much more rapidly than had become the situation in the 1980s and 1990s.
D. N. Baker, G. M. Mason
wiley   +1 more source

Response of the Thermosphere‐Ionosphere System to an X‐Class Solar Flare: 30 March 2022 Case Study

Space Weather
The response of the thermosphere ionosphere system to an X1.3 class solar flare is studied using observations of the total electron content (TEC) and the Global Ionosphere Thermosphere Model (GITM) simulations.
Volkan Sarp, Erdal Yiğit, Ali Kilcik
doaj   +1 more source

Regularized energy-dependent solar flare hard x-ray spectral index

, 2005
The deduction from solar flare X-ray photon spectroscopic data of the energy dependent model-independent spectral index is considered as an inverse problem.
A. A. Korchak, A. M. Massone, A. N. Tikhonov, Alexander L. Mackinnon, C. Johns, C. W. Groetsch, D. M. Smith, E. P. Kontar, E. P. Kontar, E. P. Kontar, E. P. Kontar, Eduard P. Kontar, G. D. Holman, H. A. Kramers, J. A. Miller, J. C. Brown, J. C. Brown, J. C. Brown, J. C. Brown, L. Fletcher, M. Aschwanden, M. Hanke, M. Piana, R. P. Lin, R. P. Lin, R. P. Lin, S. R. Kane, T. Bai, V. Petrosian   +28 more
core   +2 more sources

Using the Maximum X-ray Flux Ratio and X-ray Background to Predict Solar Flare Class [PDF]

, 2015
We present the discovery of a relationship between the maximum ratio of the flare flux (namely, 0.5-4 Ang to the 1-8 Ang flux) and non-flare background (namely, the 1-8 Ang background flux), which clearly separates flares into classes by peak flux level.
arxiv   +1 more source

Predicting CO Cameron‐Band Auroral Emission at Venus Using VEx Electron Observations

Geophysical Research Letters, Volume 52, Issue 9, 16 May 2025.
Abstract Various types of auroral emissions have been observed at (partially) magnetized planets (e.g., Earth, Jupiter, and Mars). Auroral emissions have also been observed at Venus, an unmagnetized planet, by the Pioneer Venus Orbiter (PVO) and ground‐based telescopes.
Shaosui Xu, Rudy A. Frahm, Yingjuan Ma, David L. Mitchell, Janet G. Luhmann, Jean‐Claude Gérard, Lauriane Soret, Robert J. Lillis   +7 more
wiley   +1 more source

First Global Machine Learning Model to Predict the Rate of TEC Index (ROTI) Response to X‐Class Solar Flares

Space Weather
Solar flares are bursts of electromagnetic radiation originating in the Sun's atmosphere. Solar flares cause a rapid increase in ionization in the ionosphere, resulting in radio signal interference.
A. Mahmoudian, F. Ghorbali, M. Vazifehkhah Hafteh   +2 more
doaj   +1 more source