Results 11 to 20 of about 58,091 (257)
Advances in Astronomy, 2012 The ~11-year solar cycle was first identified in the fluctuation of the number and location of sunspots and, soon after, their magnetic polarity and the dipole component of the Sun’s magnetism as a whole. The cycle is manifested in satellite records of total and variable solar luminosity, in the open solar magnetic flux, which can be estimated from ...
J. Javaraiah +2 more
doaj +3 more sources
, 2020 Abstract The Sun’s magnetic field drives the solar wind and produces space weather. It also acts as the prototype for an understanding of other stars and their planetary environments. Plasma motions in the solar interior provide the dynamo action that generates the solar magnetic field.
van Driel-Gesztelyi, Lidia +1 more
openaire +2 more sources
The solar oscillations spectrum and the solar cycle [PDF]
Symposium - International Astronomical Union, 1988 During the summer seasons of the years 1977 to 1985 daily velocity measurements of solar global oscillations have been obtained using a resonant scattering spectrometer. After calculating the power spectra of the daily residuals, the mean for each season is found.
A. Jiménez +7 more
openaire +1 more source
Solar Cycle Variation in Solar Irradiance [PDF]
Space Science Reviews, 2014 The correlation between solar irradiance and the 11-year solar activity cycle is evident in the body of measurements made from space, which extend over the past four decades. Models relating variation in solar irradiance to photospheric magnetism have made significant progress in explaining most of the apparent trends in these observations.
Yeo, K., Krivova, N., Solanki, S.
openaire +3 more sources
SOLAR CYCLE 25: ANOTHER MODERATE CYCLE? [PDF]
The Astrophysical Journal Letters, 2016 ABSTRACT Surface flux transport simulations for the descending phase of Cycle 24 using random sources (emerging bipolar magnetic regions) with empirically determined scatter of their properties provide a prediction of the axial dipole moment during the upcoming activity minimum together with a realistic uncertainty range. The expectation
R. H. Cameron, J. Jiang, M. Schüssler
openaire +3 more sources
Solar rotation over solar cycle 21 [PDF]
International Astronomical Union Colloquium, 1991 Abstract Having measured the rotation rate of sunspots through solar cycle 21, from 1977 to 1983, we have found that the mean differential rotation averaged over this seven year record is similar to the grand average differential rotation determined by Howard et al. (1984) over the period 1921-1982.
Elisabeth Ribes +3 more
openaire +1 more source
Solar Cycle Dependence of Solar p Modes [PDF]
Symposium - International Astronomical Union, 1988 Data obtained at Izana (Tenerife) and Haleakala (Maui), using optical resonant scattering with a potassium vapour cell over the years 1980–84, are used to determine the frequencies of the low ℓ p modes. Possible variation in these frequencies with the solar cycle are investigated.
G.R. Isaak +7 more
openaire +1 more source
International Journal of Geophysics, 2012 We analyse the variability of foF2 at two West Africa equatorial ionization anomaly stations (Ouagadougou and Dakar) during three solar cycles (from cycle 20 to cycle 22), that is, from 1966 to 1998 for Ouagadougou and from 1971 to 1997 for Dakar.
Frédéric Ouattara +2 more
doaj +1 more source
Prediction of even and odd sunspot cycles
Journal of Space Weather and Space Climate, 2023 Here we study the prediction of even and odd numbered sunspot cycles separately, thereby taking into account the Hale cyclicity of solar magnetism. We first show that the temporal evolution and shape of all sunspot cycles are extremely well-described by ...
Asikainen Timo, Mantere Jani
doaj +1 more source
Earth, Planets and Space, 2019 In order to statistically investigate the relationship between the low-latitude coronal holes (CHs), the solar wind speed, and the geomagnetic activity in solar cycles 23 (1996–2008) and 24 (2009–2016), we conducted a superposed epoch analysis of the ...
Yumi Nakagawa +2 more
doaj +1 more source