Results 111 to 120 of about 8,610,015 (269)

Some Experiments on the Prediction of Sunspot Numbers

Journal of the Royal Statistical Society Series B: Statistical Methodology, 1954
Summary Various methods of predicting annual sunspot numbers are considered. Linear and curvilinear regressions on previous values give very inaccurate predictions and semi-empirical methods appear better. The representation of the series as an autoregressive process is unsatisfactory.
openaire   +2 more sources

KORELASI ANTARA BILANGAN SUNSPOT DENGAN BANYAKNYA KEJADIAN BADAI GEOMAGNET (THE CORRELATION OF SUNSPOT NUMBER AND GEOMAGNETIC STORM EVENTS)

, 2016
Penelitian untuk mengetahui keterkaitan antara bilangan sunspot dengan indeks Disturbance Storm Time (Dst) yang merupakan indeks gangguan geomagnet pada lintang rendah telah dilakukan. Tujuan dari penelitian ini adalah untuk mengetahui keterkaitan antara
Siska Filawati
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Heartbeat of the sun from principal component analysis and prediction of solar activity on a millenium timescale [PDF]

, 2015
We derive two principal components (PCs) of temporal magnetic field variations over the solar cycles 21-24 from full disk magnetograms covering about 39% of data variance, with σ = 0.67. These PCs are attributed to two main magnetic waves travelling from
Shepherd, Simon J., Zharkov, Sergei I., Zharkova, V. V., Zharkov, Sergei, Popova, E., Shepherd, S. J., Zharkova, Valentina, Shepherd, Simon, Zharkov, S. I., Popova, Elena, Zharkova, Valentina V.   +10 more
core   +1 more source

Macular telangiectasia type 2 genetic risk variants associated with clinical characteristics in the Slovenian cohort

Acta Ophthalmologica, EarlyView.
Abstract Purpose Early diagnosis of macular telangiectasia type 2 (MacTel) remains challenging, and the contribution of genetic variation to its clinical heterogeneity is unclear. This study investigated associations between MacTel risk variants and clinical characteristics in a Slovenian cohort.
Ajda Kunčič, Nataša Debeljak, Petra Hudler, Janez Smerkolj, Mojca Urbančič   +4 more
wiley   +1 more source

Inter‐eye microvascular asymmetry across stages of diabetic retinopathy: An OCT angiography study

Acta Ophthalmologica, EarlyView.
Abstract Purpose To evaluate inter‐eye asymmetry in macular microvascular parameters across different stages of diabetic retinopathy (DR) using OCT angiography, and to explore the associations with clinical factors. Methods This cross sectional study included 442 eyes of 221 patients with diabetes mellitus type 2. Central subfield thickness (CST), area
Stela Vujosevic, Sema Tamer Kaderli, Gabriele Piccoli, Elena Tagliabue, Camilla Alovisi, Vanda Bucceri, Emanuele Torti, Elisa Marenzi, Dogukan Ozen, Livio Luzi, Paolo Nucci   +10 more
wiley   +1 more source

Explainable deep learning self‐supervised vision transformer for fundus‐based myopia classification

Acta Ophthalmologica, EarlyView.
Abstract Purpose To develop and validate a self‐supervised vision transformer (ViT) for automated three‐class classification of Normal, High Myopia (HM), and Pathologic Myopia (PM) from colour fundus photographs, with anatomically faithful interpretability. Methods A DINOv2 self‐supervised ViT was fine‐tuned using a two‐stage transfer‐learning protocol
Eirini Maliagkani, Christos Tsoutsas, Nikolaos Papageorgiou, Ioannis D. Apostolopoulos, Nikolaos Papandrianos, Ilias Georgalas, Elpiniki Papageorgiou   +6 more
wiley   +1 more source

Keterkaitan Indikator Aktivitas Matahari Sunspot, F10,7) Dan Semburan Sinar X

, 2001
ABSTRAK Ada keterkaitan yang erat antara tiga parameter aktivitas matahari : bilangan sunspot (R), fluks 10,7 cm (F10,7), dan intensitas radiasi Soft X-ray (ISXR).
Suratno, Suprijatno Jasman
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Solar Storm Type Classification Using Probabilistic Neural Network compared with the Self-Organizing Map [PDF]

, 2012
One of the task of the LAPAN is making observation and forecasting of solar storms disturbance. This disturbances can affect the earths electromagnetic field that disrupt the electronic and navigational equipment on earth.
Setiahadi, Bambang, Adipranata, Rudy, Satiabudhi, Gregorius, N, ADRIAN HARTANTO   +3 more
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Systematic quantification of outer retinal morphology in three different SD‐OCT devices in geographic atrophy

Acta Ophthalmologica, EarlyView.
Abstract Purpose To define interdevice differences in quantitative outer retinal biomarkers across three spectral‐domain (SD) optical coherence tomography (OCT) devices in geographic atrophy (GA). Methods Patients with GA prospectively underwent imaging using Spectralis (Heidelberg Engineering), Cirrus (Zeiss) and Maestro (Topcon) OCT devices ...
Klaudia Birner, Sophie Frank‐Publig, Julia Mai, Anna Eidenberger, Johannes Schrittwieser, Gabriel Leitner‐Barrios, Magdalena Barasits, Markus Gumpinger, Gregor S. Reiter, Stefan Sacu, Ursula Schmidt‐Erfurth   +10 more
wiley   +1 more source

An Examination of Sunspot Number Rates of Growth and Decay in Relation to the Sunspot Cycle [PDF]

, 2006
On the basis of annual sunspot number averages, sunspot number rates of growth and decay are examined relative to both minimum and maximum amplitudes and the time of their occurrences using cycles 12 through present, the most reliably determined sunspot ...
Hathaway, David H., Wilson, Robert M.
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