Results 11 to 20 of about 2,343,483 (316)
Analytical sun synchronous low-thrust manoeuvres [PDF]
, 2012 Article describes analytical sun synchronous low-thrust ...
Stephanie Y. Docherty +4 more
core +3 more sources
The Sun’s Supergranulation [PDF]
Living Reviews in Solar Physics, 2010 Supergranulation is a fluid-dynamical phenomenon taking place in the solar photosphere, primarily detected in the form of a vigorous cellular flow pattern with a typical horizontal scale of approximately 30--35~megameters, a dynamical evolution time of 24--48~h, a strong 300--400~m/s (rms) horizontal flow component and a much weaker 20--30~m/s vertical
Rincon, Francois, Rieutord, Michel
openaire +5 more sources
The EUV Sun as the superposition of elementary Suns [PDF]
Astronomy & Astrophysics, 2008 Many studies assume that the solar irradiance in the EUV can be decomposed into different contributions, which makes the modelling of the spectral variability considerably easier. We consider a different approach, in which these contributions are not imposed a priori but are effectively and robustly inferred from spectral irradiance measurements.
Amblard, Pierre-Olivier +6 more
openaire +4 more sources
Astronomical features of Ural megalithic monuments orientation [PDF]
Archaeoastronomy and Ancient Technologies, 2014 There is a presence of archaeological monuments of the early and middle Holocene in the middle Trans-Urals, which may be associated with the act of sky survey, determined by this specific landscape.
Viktorova, V.D., Anisimov, N.P.
doaj +1 more source
The fine structure of the rotational periods of the solar mean magnetic field
Open Astronomy, 2021 The data of mean magnetic field (MMF) of the Sun obtained at the Wilcox Solar Observatory (Stanford, USA) in 1975–2020 are analysed. It was concluded that the MMF maximum occurs, on average, 1.5–2 years later relative to the maximum of Wolf numbers.
Haneychuk Vasily Ivanovich +1 more
doaj +1 more source
Sudden transitions and grand variations in the solar dynamo, past and future☆
Journal of Space Weather and Space Climate, 2012 The solar dynamo is the exotic dance of the sun’s two major magnetic field components, the poloidal and the toroidal, interacting in anti-phase. On the basis of new data on the geomagnetic aa index, we improve our previous forecast of the properties of ...
De Jager Cornelis, Duhau Silvia
doaj +1 more source
Revealing Fifth-Grade Students’ Understanding of the Universe
Mimbar Sekolah Dasar, 2022 Previous research has shown that students at almost all levels have misconceptions about both the shapes and sizes of celestial bodies in space. This study is essential to conduct on the students who take space topic in their schools for the first time ...
Fatma Coştu +2 more
doaj +1 more source
Journal of Space Weather and Space Climate, 2020 We present the observing program proposed by Paris and Côte d’Azur Observatories for monitoring solar activity during the upcoming cycle 25 and providing near real time images and movies of the chromosphere for space-weather research and applications ...
Malherbe Jean-Marie +2 more
doaj +1 more source
Isolated Sunspot with a Dark Patch in the Coronal Emission
Open Astronomy, 2012 On the base of the 17 GHz radio maps of the Sun taken with the Nobeyama Radio Heliograph we estimate plasma parameters in the specific region of the sunspot atmosphere in the active region AR 11312.
Bezrukov D. A. +2 more
doaj +1 more source