Results 51 to 60 of about 28,762 (292)

Sunspots and Meteorology [PDF]

Science, 1894
n ...
openaire   +3 more sources

Disturbances in the geomagnetic field, water level and atmospheric pressure associated with Mw ≥ 6.6 earthquakes in the South Atlantic Ocean

Geofísica Internacional, 2023
This paper is aimed at studying disturbances in the earth’s geomagnetic field (GMF), water level (WL) and sea-level atmospheric pressure (AP) associated with Mw≥ 6.6 seismic events in the in the Scotia arch, in the South Atlantic.
María Alejandra Arecco, Patricia Alejandra Larocca, Fernando Ariel Oreiro, Mónica María Elisa Fiore, Lidia Ana Otero, María Florencia   +5 more
doaj   +1 more source

A Hybrid Model for Forecasting Sunspots Time Series Based on Variational Mode Decomposition and Backpropagation Neural Network Improved by Firefly Algorithm

Computational Intelligence and Neuroscience, 2018
The change of the number of sunspots has a great impact on the Earth's climate, agriculture, communications, natural disasters, and other aspects, so it is very important to predict the number of sunspots. Aiming at the chaotic characteristics of monthly
Guo-Hui Li, Xiao Ma, Hong Yang
semanticscholar   +1 more source

11-year dynamics of coronal hole and sunspot areas

Open Astronomy, 2022
The paper presents study the 11-year dynamics of solar activity on the basis of new observational material on coronal holes (CHs) and sunspots in the period from May 13, 2010 to May 13, 2021.
Andreeva Olga, Abramenko Valentina, Malashchuk Valentina   +2 more
doaj   +1 more source

Invisible sunspots and rate of solar magnetic flux emergence [PDF]

, 2007
<p><b>Aims:</b> We study the visibility of sunspots and its influence on observed values of sunspot region parameters.</p> <p><b>Methods:</b> We use Virtual Observatory tools provided by AstroGrid to analyse a
Walton, N.A., Dalla, S., Fletcher, L., L. Fletcher, N. A. Walton, S. Dalla, Walton, N. A.   +6 more
core   +1 more source

Sunspots [PDF]

, 2008
Introduction: Sunspots are some of the most notable features of the Sun. Use a telescope to track the changes in position and shape of sunspots over time.
McDonald Observatory, University of Texas at Austin   +1 more
core   +1 more source

Detecting the Sun’s active region using image processing techniques

Physical Sciences and Technology, 2021
The term ‘space weather’ refers to adverse conditions on the Sun that could affect the structures of space or terrestrial technology and risk human health or life. Flares produce effects that span the electromagnetic spectrum.
A. Sarsembayeva, M. Odsuren, F. Belisarova, A. Sarsembay, S. A. L. Maftunzada   +4 more
doaj  

SUNSPOTS AND CREDIT FRICTIONS [PDF]

Macroeconomic Dynamics, 2012
We examine a general equilibrium model with collateral constraints and increasing returns to scale in production. The utility function is nonseparable, with no income effect on the consumer's choice of leisure. Unlike this model without a collateral constraint, we find that indeterminacy of equilibria is possible.
Harrison, S., Weder, M.
openaire   +4 more sources

Inferring Plasma Flows at Granular and Supergranular Scales With a New Architecture for the DeepVel Neural Network

Frontiers in Astronomy and Space Sciences, 2020
The wealth of observational data available has been instrumental in investigating physical features relevant to solar granulation, supergranulation and Active Regions.
Benoit Tremblay, Benoit Tremblay, Raphaël Attie, Raphaël Attie   +3 more
doaj   +1 more source

Sunspots, Starspots, and Elemental Abundances

, 2017
Element abundances in the solar photosphere, chromosphere, transition region, and corona are key parameters for investigating sources of the solar wind and for estimating radiative losses in the quiet corona and in dynamical events such as solar flares ...
G. Doschek, H. Warren
semanticscholar   +1 more source