Results 31 to 40 of about 9,553 (254)

Solar flare forecasting using morphological properties of sunspot groups

Journal of Space Weather and Space Climate, 2019
We describe a new tool developed for solar flare forecasting on the base of some sunspot group properties. Assuming that the flare frequency follows the Poisson statistics, this tool uses a database containing the morphological characteristics of the ...
Falco Mariachiara, Costa Pierfrancesco, Romano Paolo   +2 more
doaj   +1 more source

Characteristics of Flare-Productive Sunspot Groups [PDF]

Highlights of Astronomy, 2002
AbstractThe mechanism of flare energy build-up is one of the most fundamental questions in the solar flare study, but is still to be solved. From the review of the previous studies, we notice that the formation process of the magnetic shear in an active region should be essential for the flare energy build-up mechanism.
Takako T. Ishii, Hiroki Kurokawa, Tsutomu T. Takeuchi   +2 more
openaire   +1 more source

The Phase Shifts of the Paired Wings of Butterfly Diagrams

, 2010
Sunspot groups observed by Royal Greenwich Observatory/US Air Force/NOAA from May 1874 to November 2008 and the Carte Synoptique solar filaments from March 1919 to December 1989 are used to investigate the relative phase shift of the paired wings of ...
Feng, Wen, Li, Kejun, Liang, Hongfei
core   +1 more source

Morphological feature extraction for statistical learning with applications to solar image data [PDF]

, 2013
: Many areas of science are generating large volumes of digital image data. In order to take full advantage of the high-resolution and high-cadence images modern technology is producing, methods to automatically process and analyze large batches of such ...
Adams, Aschwanden, Aschwanden, Aschwanden, Bolduc, Breiman, Colak, Curto, Gonzalez, Ireland, McIntosh, Serra, Soille, Stenning, Woodard   +14 more
core   +2 more sources

Flare-production potential associated with different sunspot groups [PDF]

Monthly Notices of the Royal Astronomical Society, 2016
In this study, we analysed different types (C, M, and X classes) of X-ray solar flares occurring in sunspot groups. The data cover 1996-2014 time interval, and a total of 4262 active regions (ARs) were included in the data set. We defined the solar-flare-production potential as the ratio of the total number of flares observed in a sunspot group to the ...
Eren, S., Kilcik, A., Atay, T., Miteva, R., Yurchyshyn, V., Rozelot, J. P., Ozguc, A.   +6 more
openaire   +2 more sources

Nanozymes at the Bio‐Nano Interface: From Synthesis, Defect Engineering, Catalytic Behavior in Biological Microenvironments, and Biosafety Implications

Advanced Materials Interfaces, EarlyView.
Nanozymes (NZs) have emerged as versatile artificial enzymes with tunable catalytic properties driven by atomic coordination, defect engineering, and surface chemistry. This review presents a bio–nano interface framework linking synthesis strategies, structural design, and catalytic behavior within complex biological microenvironments.
Karen Guadalupe Quintero‐Garrido, Aída Jimena Velarde‐Salcedo, Alejandro López‐Amador, Noé Arjona, Citlali Uitz Toalá, Carmen Gonzalez, Beatriz Liliana España‐Sánchez   +6 more
wiley   +1 more source

Analyzing the Sequence of Phases Leading to the Formation of the Active Region 13664, with Potential Carrington-like Characteristics

The Astrophysical Journal Letters
Several recurrent X-class flares from Active Region (AR) 13664 triggered a severe G5-class geomagnetic storm between 2024 May 10 and 11. The morphology and compactness of this AR closely resemble the AR responsible for the famous Carrington Event of 1859.
P. Romano, A. Elmhamdi, A. Marassi, and L. Contarino   +3 more
doaj   +1 more source

Sunspots sketches during the solar eclipses of 9th January and 29th December of 1777 in Mexico

Journal of Space Weather and Space Climate, 2017
Two sunspot observations recorded by the Mexican Felipe de Zúñiga y Ontiveros have been revealed from a manuscript. One sunspot group was recorded on 9th January 1777 and four sunspot groups on 29th December 1777.
Domínguez-Castro Fernando, Gallego María Cruz, Vaquero José Manuel   +2 more
doaj   +1 more source

Inconsistency of the Wolf sunspot number series around 1848 [PDF]

, 2013
Aims. Sunspot number is a benchmark series in many studies, but may still contain inhomogeneities and inconsistencies. In particular, an essential discrepancy exists between the two main sunspot number series, Wolf (WSN) and group (GSN) sunspot numbers ...
Arlt, R., Leussu, R., Mursula, K., Usoskin, I. G.   +3 more
core   +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