Results 61 to 70 of about 3,043 (224)

Solar Flare Activity, 1937–2024: Introducing the New Hemispheric Solar Flare Index (hSFI) in the Context of 2024's Major Solar Storm Events

Space Weather, Volume 23, Issue 11, November 2025.
Abstract A new daily composite of the solar flare index (SFI) and the hemispherically‐resolved versions (hSFI) are presented for 1937 to 2024. The data set confirms that the northern hemisphere (NH) dominated solar flare activity during Solar Cycles 17 to 21, but that the southern hemisphere has dominated from Solar Cycle 22 to present.
V. M. Velasco Herrera, W. Soon, S. Knoška, A. Özgüç, G. Velasco Herrera, H. Yeşilyaprak, N. Babynets, M. Švanda, J. Muraközy, S. Qiu, D. Riveros‐Rosas, R. Connolly, M. Connolly, A. Tlatov, L. Cappellotto   +14 more
wiley   +1 more source

On the Nature of the Solar Chromosphere

, 2006
Proceedings 23th NSO Workshop, ASP Conference Series, 354, 282, in ...
openaire   +4 more sources

MORPHOLOGY AND DYNAMICS OF THE LOW SOLAR CHROMOSPHERE [PDF]

The Astrophysical Journal, 2009
accepted by ApJ, 16 pages, 8 ...
Wöger, F., Wedemeyer-Böhm, S., Uitenbroek, H., Rimmele, T. R.   +3 more
openaire   +2 more sources

The magnetic sensitivity of the Ca II H and K lines

Astronomy & Astrophysics
Context. The solar chromosphere is a transition layer between the cool, dense photosphere and the hot, rarefied corona. This boundary region plays a key role in regulating energy transport and structuring the magnetic field throughout the solar ...
Kriginsky M., Leenaarts J., de la Cruz Rodríguez J., Danilovic S., Andriienko O.   +4 more
doaj   +1 more source

Solar Radio Wide‐Band Spectroscopy and Imaging Facilities of the Chinese Meridian Project Phase II

Space Weather, Volume 23, Issue 11, November 2025.
Abstract Solar eruptions, including flares and coronal mass ejections, are the most energetic phenomena in the solar system. These explosive events accelerate high‐energy particles and generate electromagnetic radiation from radio to gamma‐ray wavelengths, producing heliospheric disturbances and acting as primary drivers of space weather hazards.
Yihua Yan, Wei Wang, Linjie Chen, Jin Fan, Yao Chen, Shuwang Chang, Fabao Yan, Lihong Geng, Sha Li, Cang Su, Zhijun Chen, Chengming Tan, Bing Wang, Guang Lu, Chuanyang Li, Zhichao Zhou, Fei Liu, Suli Ma, Jun Cheng, Jing Du   +19 more
wiley   +1 more source

Radiative Diagnostics in the Solar Photosphere and Chromosphere [PDF]

Space Science Reviews, 2016
Accepted for publication in Space Science Reviews.
J. de la Cruz Rodríguez, M. van Noort
openaire   +4 more sources

Structure and dynamics of the solar chromosphere [PDF]

, 2002
The thesis "Structure and dynamics of the solar chromosphere" of J.M. Krijger is a study on the behavior of the solar chromosphere, the thin layer just above the solar surface (photosphere) visible in purple red light during a total solar eclipse.
Krijger, Johannes Mattheus
core  

Measurement of Turbulence Injection Scale Down to the Chromosphere

The Astrophysical Journal Letters
The solar atmosphere displays a sharp temperature gradient, starting from spicules in the chromosphere at 2 × 10 ^4 K, outward into the corona exceeding ${10}^{6}$ K.
Zachary Bailey, Riddhi Bandyopadhyay, Shadia Habbal, Miloslav Druckmüller   +3 more
doaj   +1 more source

Dominant Trends in Jupiter's H3+ ${\mathbf{H}}_{\mathbf{3}}^{\mathbf{+}}$ Northern Aurora: II. Magnetospheric Mapping

Journal of Geophysical Research: Space Physics, Volume 130, Issue 10, October 2025.
Abstract Jupiter's auroral regions have previously been defined by broad‐scale auroral structures, but these are typically obscured by the wide array of temporal variability observed at timescales between minutes and days, making it difficult to understand the underlying magnetospheric biases driving these brightness differences.
Tom S. Stallard, Katie L. Knowles, Henrik Melin, Ruoyan Wang, Emma M. Thomas, Luke Moore, James O’Donoghue, Rosie E. Johnson, Steve Miller, John C. Coxon   +9 more
wiley   +1 more source

Observations of the upper solar chromosphere with SUMER

, 2003
The structure and dynamics of the solar chromosphere are still matters of debate. The chromospheric network reflecting the supergranulation of the outer convection zone of the Sun is a prominent feature of the lower solar atmosphere that extends into the
Kalkofen, W., K. Wilhelm, Wilhelm, K., W. Kalkofen   +3 more
core   +1 more source