Results 31 to 40 of about 5,860 (269)
Introduction to Sunspots and Lotteries [PDF]
Journal of Economic Theory, 2002 zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Edward C. Prescott, Karl Shell
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Numerical simulations of sunspots [PDF]
, 2006 The origin, structure and evolution of sunspots are investigated using a numerical model. The compressible MHD equations are solved with physical parameter values that approximate the top layer of the solar convection zone.
Hurlburt, Neal +2 more
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Identification of beryllium hydride isotopomer lines in sunspot umbral spectra [PDF]
Serbian Astronomical Journal, 2008 A high resolution spectrum of FTS sunspot umbra of NSO/Kitt Peak was used to conduct a search for the molecular absorption lines due to BeH, BeD and BeT isotopomers. Analysis led to estimates of identification of the molecular lines of bands A - X (0,0),
Shanmugavel R. +3 more
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Journal of Space Weather and Space Climate, 2023 The Madrid Astronomical Observatory implemented a solar observation program from 1876 to 1986. In addition to sunspots, the observers at this observatory recorded other solar features such as prominences.
Aparicio Alejandro Jesús Pérez +3 more
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, 2022 This paper shows that belief-driven economic fluctuations are a general feature of many determinate macroeconomic models. In environments with hidden state variables, forecast-model misspecification can break the link between indeterminacy and sunspots ...
Zhu, Mei +2 more
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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. +6 more
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N-S Asymmetry and Solar Cycle Distribution of Superactive Regions from 1976 to 2017
Universe, 2022 There were 51 superactive regions (SARs) during solar cycles (SCs) 21–24. We divided the SARs into SARs1, which produced extreme space weather events including ≥X5.0 flares, ground level events (GLEs), and super geomagnetic storms (SGSs, Dst < −250 nT ...
Ming-Xian Zhao +2 more
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A note on the sunspot and prominence records made by Angelo Secchi during the period 1871–1875
Journal of Space Weather and Space Climate, 2021 Angelo Secchi (1818–1878) was an Italian Jesuit who made relevant scientific contributions in geophysics, meteorology, and astrophysics. He was a well-known pioneer in solar physics due to his theories and observations.
Carrasco Víctor M. S. +4 more
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Seismology of active regions: Current status and perspectives
Frontiers in Astronomy and Space Sciences, 2023 The goal of helioseismology is to provide accurate information about the Sun’s interior from the observations of the wave field at its surface. In the last three decades, both global and local helioseismology studies have made significant advances and ...
Sushanta Tripathy
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