Results 111 to 120 of about 1,129,035 (260)
Particle Acceleration in Solar Flares [PDF]
International Astronomical Union Colloquium, 1989 AbstractParticle acceleration during solar flares is a complex process where the main ‘actors’ (Direct (D.C.) or turbulent electric fields) are hidden from us. It is easy to construct a successful particle accelertion model if we are allowed to impose on the flaring region arbitrary conditions (e.g., strength and scale length of the D.C.
openaire +3 more sources
The Association Between Urbanisation and Household Food Security in Nigeria
Maternal &Child Nutrition, EarlyView.This paper focuses on the nexus between urbanisation and household food security in the context of Nigeria. The study uses night‐time light intensity as a proxy for urbanisation to capture the variation in urbanisation to estimate its relationship to household food security.
Joseph B. Ajefu +2 more
wiley +1 more source
Energy Deposition into the Ionosphere during a Solar Flare with Extreme-ultraviolet Late Phase
The Astrophysical Journal LettersSolar extreme-ultraviolet (EUV) irradiance is the dominant energy source for ionizing and heating the Earth’s upper atmosphere. It is common to assume that the spectra of different EUV lines have the same trend to fill the solar EUV irradiance gap for ...
Jing Liu +8 more
doaj +1 more source
Frontiers in Astronomy and Space SciencesThe effects of solar flares in the D-region ionosphere at two high-latitude stations: Maitri (70.75°S, 11.75°E) and Abisko (68.4°N, 18.9°E), located in different hemispheres are studied. We analyzed 37 M-class flares and 6 X-class flares of the year 2014,
Shipra Sinha +3 more
doaj +1 more source
Geophysical Research Letters, 2018 Solar extreme ultraviolet and X‐ray photons are the main sources of ionization in the Martian ionosphere and can be enhanced significantly during a solar flare.
Shaosui Xu +9 more
semanticscholar +1 more source
Explosive Chromospheric Evaporation Driven by Nonthermal Electrons around One Footpoint of a Solar Flare Loop [PDF]
, 2017 We explore the temporal relationship between microwave/hard X-ray (HXR) emission and Doppler velocity during the impulsive phase of a solar flare on 2014 October 27 (SOL2014-10-27) that displays a pulse on the light curves in the microwave (34 GHz) and ...
D. Li, Z. Ning, Y. Huang, Q. M. Zhang
semanticscholar +1 more source
Comparison of UV Ceti Flares with Solar Flares [PDF]
Symposium - International Astronomical Union, 1975 During several intervals totalling 26 h, 84 flares of UV Ceti were observed using a photometer with 1 s time resolution. Using solar flare terminology, all flares of UV Ceti observed here can be characterized by a typical light curve, consisting of a preflare, a flash and a slow phase.
W. Haupt, W. Schlosser
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Risk Analysis, EarlyView.Abstract There are two separate conceptualizations for assessing existential risks: Planetary Boundaries (PBs) and global catastrophic risks (GCRs). While these concepts are similar in principle, their underpinning literatures tend not to engage with each other.
Eoin McLaughlin, Matthias Beck
wiley +1 more source
GLOBAL SAUSAGE OSCILLATION OF SOLAR FLARE LOOPS DETECTED BY THE INTERFACE REGION IMAGING SPECTROGRAPH [PDF]
, 2016 An observation from the Interface Region Imaging Spectrograph reveals coherent oscillations in the loops of an M1.6 flare on 2015 March 12. Both the intensity and Doppler shift of Fe xxi 1354.08 Å show clear oscillations with a period of ∼25 s ...
H. Tian +6 more
semanticscholar +1 more source
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