Results 51 to 60 of about 3,439,333 (263)

Charting the solar cycle

Frontiers in Astronomy and Space Sciences, 2023
Sunspot records reveal that whilst the Sun has an approximately 11 year cycle of activity, no two cycles are of the same duration. Since this activity is a direct driver of space weather at Earth, this presents an operational challenge to quantifying ...
S. C. Chapman, S. C. Chapman
doaj   +1 more source

Sunspot Cycle Minima and Pandemics: The Case for Vigilance?

, 2017
Direct records of sunspots and the solar cycle have been maintained in astronomical observatories for about 1610 AD, while indirect records derived from 14C analysis of ice cores go back to about 900 AD.
N. Wickramasinghe, E. Steele, M. Wainwright, G. Tokoro, M. Fernando, Jiangwen Qu   +5 more
semanticscholar   +1 more source

Does Correction Factor Vary with Solar Cycle? [PDF]

Journal of Astronomy and Space Sciences, 2012
Monitoring sunspots consistently is the most basic step required to study various aspects of solar activity. To achieve this goal, the observers must regularly calculate their own correction factor k and keep it stable. Relatively recently, two observing
Heon-Young Chang, Sung-Jin Oh
doaj   +1 more source

GATA4‐Driven Transcription of HtrA1 Promotes Cellular Senescence in Ménière's Disease and Age‐Related Audio‐Vestibular Dysfunction

Advanced Science, EarlyView.
This study identifies the HDAC6/GATA4/HtrA1 axis as a critical driver of cellular senescence in the inner ear. GATA4 nuclear translocation, facilitated by HDAC6 downregulation, transcriptionally activates HtrA1, promoting hair cell senescence, SASP, and audio‐vestibular dysfunction in models of Ménière's disease and age‐related audio‐vestibular ...
Na Zhang, Na Li, Yan Wang, Jing Zhang, Jiahui Liu, Lei Chen, Yongdong Song, Yurong Mu, Yuechen Han, Yafeng Lyu, Xiaofei Li, Hanyue Wang, Jing Wang, Yao Lu, Zhaomin Fan, Daogong Zhang, Haibo Wang   +16 more
wiley   +1 more source

Analyses of Johannes Kepler’s Sunspot Drawings in 1607: A Revised Scenario for the Solar Cycles in the Early 17th Century

The Astrophysical Journal Letters
Telescopic sunspot observations began in 1610 and captured subsequent solar cycles. In combination with proxy reconstructions on an annual scale, these data sets indicate a gradual transition between regular solar cycles and the Maunder Minimum.
Hisashi Hayakawa, Koji Murata, E. Thomas H. Teague, Sabrina Bechet, Mitsuru Sôma   +4 more
doaj   +1 more source

Some peculiarities in longitude distribution of sunspot groups over last four eleven-year solar cycles

Solar-Terrestrial Physics, 2016
This paper considers a longitude distribution of sunspot groups over 1982–2013, using data from the National Geophysical Data Center (Boulder, USA).
Rybak A.L.
doaj   +1 more source

ACLY‐Driven Metabolic Reprogramming Promotes Histone Acetylation and Inflammation‐Associated Fibrosis in Chronic Kidney Disease

Advanced Science, EarlyView.
This study reveals a citrate–ACLY–H3K27ac metabolic–epigenetic axis driving inflammatory gene activation and kidney fibrosis, highlighting ACLY inhibition as a potential therapeutic strategy for chronic kidney disease (CKD). ABSTRACT The mechanisms by which metabolic stress drives epigenetic dysregulation and fibrosis in chronic kidney disease (CKD ...
Chunxiu Du, Dhanunjay Mukhi, Lingzhi Li, Chenyu Li, Siyu Pan, Bernhard Dumoulin, Eunji Ha, Lakshmi P Kolligundla, Yanjuan Hou, Jonathan Levinsohn, Chaelin Kang, Konstantin Adrian Klötzer, Junnan Wu, Samer Mohandes, Kathryn E Wellen, Katalin Susztak   +15 more
wiley   +1 more source

Maximum Sunspot Numbers and Active Days [PDF]

Journal of Astronomy and Space Sciences, 2013
Parameters associated with solar minimum have been studied to relate them to solar activity at solar maximum so that one could possibly predict behaviors of an upcoming solar cycle.
Heon-Young Chang
doaj   +1 more source

Cyclic and Long-term Variation of Sunspot Magnetic Fields

, 2013
Measurements from the Mount Wilson Observatory (MWO) are used to study the long-term variations of sunspot field strengths from 1920 to 1958. Following a modified approach similar to that in Pevtsov et al.
A.A. Pevtsov, A.V. Mordvinov, F.T. Watson, J. Houtgast, M.J. Penn, M.J. Penn, R. Rezaei, T.S. Ringnes, W. Livingston, W. Livingston   +9 more
core   +1 more source

Digitization of sunspot drawings by Sp\"orer made in 1861-1894 [PDF]

, 2014
Most of our knowledge about the Sun's activity cycle arises from sunspot observations over the last centuries since telescopes have been used for astronomy. The German astronomer Gustav Sp\"orer observed almost daily the Sun from 1861 until the beginning
Arlt, Rainer, Denker, Carsten, Diercke, Andrea   +2 more
core   +1 more source