Results 1 to 10 of about 9,553 (254)
Relationship between group sunspot number and Wolf sunspot number [PDF]
Astronomische Nachrichten, 2010 Continuous wavelet transform and cross-wavelet transform have been used to investigate the phase periodicity and synchrony of the monthly mean Wolf ($R_{z}$) and group ($R_{g}$) sunspot numbers during the period of June 1795 to December 1995. The Schwabe
Echer +20 more
core +2 more sources
Statistics of sunspot group clusters [PDF]
Journal of Space Weather and Space Climate, 2013 The Zubrzycki method is utilized to find all sunspot groups which are close to each other during each Carrington rotation. The sunspot group areas and their positions for the years 1874–2008 are used.
Getko Ryszarda
doaj +2 more sources
Sunspot Group Development in High Resolution [PDF]
Solar Physics, 2013 The Solar and Heliospheric Obseratory/Michelson Doppler Imager--Debrecen Data (SDD) sunspot catalogue provides an opportunity to study the details and development of sunspot groups on a large statistical sample.
Baranyi, T., Ludmány, A., Muraközy, J.
core +4 more sources
Lifetime of Long-Lived Sunspot Groups
UniverseStudies of active region (AR) lifetimes are mostly restricted to short-lived ARs. The aim of this paper is to include recurrent ARs, which should be identified unambiguously.
Judit Muraközy
doaj +2 more sources
The Astrophysical Journal Supplement Series, 2023 Angelo Secchi, an Italian Jesuit and prominent scientist of the 19th century, and one of the founders of modern astrophysics, observed the Sun regularly at the Collegio Romano in Rome, Italy, for more than 25 yr.
I. Ermolli +5 more
doaj +1 more source
Change of Sunspot Groups Observed from 2002 to 2011 at ButterStar Observatory [PDF]
Journal of Astronomy and Space Sciences, 2012 Since the development of surface magnetic features should reflect the evolution of the solar magnetic field in the deep interior of the Sun, it is crucial to study properties of sunspots and sunspot groups to understand the physical processes working ...
Sung-Jin Oh, Heon-Young Chang
doaj +1 more source
Differential Rotation for Different-sized Sunspot Groups Early Observed by the OGAUC
The Astrophysical Journal, 2023 Solar differential rotation is an important ingredient of the solar dynamo model, not only because the solar rotation profile is one of the key inputs in a solar dynamo model, but also because it imposes constraints for the solar dynamo model.
Miao Wan +3 more
doaj +1 more source
PRE-FLARE DYNAMICS OF SUNSPOT GROUPS [PDF]
The Astrophysical Journal, 2014 Several papers provide evidences that the most probable sites of flare onset are the regions of high horizontal magnetic field gradients in solar active regions. Besides the localization of flare producing areas the present work intends to reveal the characteristic temporal variations in these regions prior to flares.
Korsós, Marianna Brigitta +2 more
openaire +3 more sources
Sunspot Count Periodicities in Different Zurich Sunspot Group Classes Since 1986 [PDF]
Solar Physics, 2014 Accepted Solar Physics ...
Kilcik, A. +3 more
openaire +2 more sources
Observing And Measuring Sunspots In VIS And NIR Regions [PDF]
Engineering and Technology Journal, 2010 This study is dedicated for observing and studying sunspots in the visible andnear infrared regions. Visible and near infrared CCD solar imaging system employing5 inch reflecting telescope is used.
Mohamed Saleh Ahmed, Layale Yahya Salih
doaj +1 more source