Results 41 to 50 of about 3,457 (163)

A Study of Long-Term Solar Activity at 37 GHz

Open Astronomy, 2012
In this paper we investigate the solar activity at the radio frequency (37 GHz) using an extensive data series (solar radio maps) from the Metsähovi Radio Observatory.
Kallunki J., Lavonen N., Järvelä E., Uunila M.   +3 more
doaj   +1 more source

Exploring the Dynamic Rotational Profile of the Hotter Solar Atmosphere: A Multiwavelength Approach Using SDO/AIA Data

The Astrophysical Journal
Understanding the global rotational profile of the solar atmosphere and its variation is fundamental to uncovering a comprehensive understanding of the dynamics of the solar magnetic field and the extent of coupling between different layers of the Sun ...
Srinjana Routh, Bibhuti Kumar Jha, Dibya Kirti Mishra, Tom Van Doorsselaere, Vaibhav Pant, Subhamoy Chatterjee, Dipankar Banerjee   +6 more
doaj   +1 more source

A solar cycle clock for extreme space weather

Scientific Reports
The variable solar cycle of activity is a long-standing problem in physics. It modulates the overall level of space weather activity at earth, which in turn can have significant societal impact.
S. C. Chapman, T. Dudok de Wit
doaj   +1 more source

Solar Coronal Rotation from 1973 to 2017: An Analytical Approach Based on Coronal Hole Areas

The Astrophysical Journal
Solar coronal rotation exhibits significant complexity, and its relationship with the 11 yr solar cycle remains poorly understood. Using 597 McIntosh synoptic maps (CR1601–CR2197), we construct the temporal evolution of coronal rotation by performing ...
Zhijun Zhao, Yalin Li, Nanbin Xiang, Linhua Deng, Haijing Zhou, Xinhua Zhao   +5 more
doaj   +1 more source

Investigating Variations in Solar Differential Rotation by Helioseismology

The Astrophysical Journal
Helioseismic signatures of dynamo waves have recently been discovered in variations of the solar differential rotation, offering valuable insights into the type of dynamo mechanism operating in the solar convection zone. To characterize these variations,
Krishnendu Mandal, Alexander G. Kosovichev, Valery V. Pipin, Sylvain G. Korzennik   +3 more
doaj   +1 more source

Λ effect in rotating hydrodynamic convection

Astronomy & Astrophysics
Context. Rotating anisotropic convection generates differential rotation in stellar convection zones. Aims. The main aim is to compute the non-diffusive contribution (Λ effect) to angular momentum transport – described by Reynolds stress – from rotating ...
Käpylä P. J.
doaj   +1 more source

Characteristics of the Solar Differential Rotation and Activity During Solar Cycle No. 24

Universe
An analysis of the solar differential rotation (DR) during solar cycle No. 24 (SC24) (2009–2019), based on the Kanzelhöhe Observatory for Solar and Environmental Research (KSO) data set, is presented.
Ivana Poljančić Beljan, Luka Šibenik, Klaudija Lončarić, Tomislav Jurkić, Rajka Jurdana-Šepić, Werner Pötzi, Damir Hržina, Roman Brajša, Astrid M. Veronig, Arnold Hanslmeier   +9 more
doaj   +1 more source

Magnetic activity on the young Sun: A case study of EK Draconis

Astronomy & Astrophysics
Context. Young solar analog stars provide key insights into the early stages of stellar evolution, particularly in terms of magnetic activity and rotation.
Görgei A., Kriskovics L., Vida K., Seli B., Oláh K., Sági P., Bódi A., Järvinen S. P., Strassmeier K. G., Pál A., Kővári Zs.   +10 more
doaj   +1 more source

Modelling solar and stellar differential rotation

Journal of Physics: Conference Series, 2008
We present a model of stellar differential rotation based on the mean-field theory of fluid dynamics. DR is driven by Reynolds stress and anisotropic heat transport caused by the Coriolis force. Our model reproduces the rotation pattern in the solar convection zone and allows predictions for other stars with outer convection zones.
Manfred Küker, Günther Rüdiger
openaire   +1 more source

Prediction of the Next Solar Rotation Synoptic Maps Using an Artificial Intelligence–based Surface Flux Transport Model

The Astrophysical Journal Supplement Series
In this study, we develop an artificial intelligence (AI)-based solar surface flux transport (SFT) model. We predict synoptic maps for the next solar rotation (27.2753 days) using deep learning.
Hyun-Jin Jeong, Mingyu Jeon, Daeil Kim, Youngjae Kim, Ji-Hye Baek, Yong-Jae Moon, Seonghwan Choi   +6 more
doaj   +1 more source