Results 81 to 90 of about 1,057 (192)

The positive correlation between the progressive photoreceptor damage and the increased macular leakage indicating the severity of diabetic retinopathy

Journal of Diabetes Investigation, Volume 17, Issue 8, Page 1348-1357, August 2026.
The dark area of photoreceptor cells, as measured by adaptive optics laser scanning ophthalmoscopy, shows significant enlargement with the progression of diabetic retinopathy (DR). A similar trend is observed for macular vascular leakage assessed by fundus fluorescein angiography. A positive correlation exists between these two parameters, suggesting a
Qi Fang, Bingjie Qiu, Xinyue Xu, Wei Jia, Ru Wang, Qianfeng Wang, Wei Qiang, Lei Zhang, Jingfa Zhang, Haiyan Wang   +9 more
wiley   +1 more source

Extraction of Sunspots from Chinese Sunspot Drawings Based on Semisupervised Learning

The Astrophysical Journal
China has six observing stations, providing over 52,000 handwritten sunspot drawings from 1947–2016. The observing stations are the Purple Mountain Astronomical Observatory (PMO), Yunnan Astronomical Observatory (YNAO), Qingdao Observatory Station (QDOS),
Qianqian Dong, Yunfei Yang, Song Feng, Wei Dai, Bo Liang, Jianping Xiong   +5 more
doaj   +1 more source

Response of Topside Ionospheric Electron Density During Solar Flares Using 2014–2024 Swarm Satellite Measurements

Geophysical Research Letters, Volume 53, Issue 14, 28 July 2026.
Abstract This paper presents a global statistical investigation into the topside ionosphere electron density response to X‐class solar flares during geomagnetically quiet conditions (Kp ≤ $\mathit{\le }$ 2) using Swarm satellites (462–511 km) data from 2014 to 2024.
Kenny Palo Monontsi, John Bosco Habarulema, Alessio Pignalberi, Christopher Dzivhuluwani Ndiitwani   +3 more
wiley   +1 more source

Solar‐Cycle Modulation of Subsurface Ocean Memory via the North Pacific Eastern Subtropical Mode Water

Geophysical Research Letters, Volume 53, Issue 14, 28 July 2026.
Abstract The North Pacific eastern subtropical mode water (NPESTMW) connects the subtropics and tropics, influencing climate variability on interannual to decadal timescales. Using eight decades of ocean reanalysis, we show that the 11‐year solar‐cycle robustly modulates NPESTMW volume. NPESTMW formation is suppressed 1–2 years after solar maxima: high
Jianing Wang, YongFu Lin, Jin‐Yi Yu, Fan Wang, LingLing Liu   +4 more
wiley   +1 more source

Low-latitude Sunspot Group Tilt Angles in 15–24 Activity Cycles

The Astrophysical Journal
An analysis of the tilt angles of the active regions in 15–24 activity cycles was performed. We used data from measurements of magnetic fields in the sunspot umbra in the period 1918–2019 at the Mount Wilson Observatory, as well as the tilt angles of ...
Andrey G. Tlatov
doaj   +1 more source

Enhancement of Dayside Westward Electrojet: Triggering Conditions and Current Closures

Geophysical Research Letters, Volume 53, Issue 14, 28 July 2026.
Abstract Geomagnetic substorms are a major path for energy storage and release in the magnetosphere, which typically occur in the midnight sector with a strong enhancement of westward electrojets. However, by analyzing 37,940 events from a substorm list, about 3% of events unexpectedly initiated in the noon sector.
Haobo Fu, Chao Yue, Dedong Wang, Qiugang Zong, Huiting Feng, Yuri Shprits   +5 more
wiley   +1 more source

An Improved Prediction of Solar Cycles 25 and 26 Using the Informer Model: Gnevyshev Peaks and North–South Asymmetry

The Astrophysical Journal
Forecasting the amplitude and timing of the sunspot cycle is highly important for solar physics and space weather applications, but high-precision prediction of solar magnetic activity has remained an outstanding challenge.
Jie Cao, Tingting Xu, Linhua Deng, Xueliang Zhou, Shangxi Li, Yuxia Liu, Wenhua Wang, Weihong Zhou   +7 more
doaj   +1 more source

Physics‐Embedded Deep Learning Reveals the Memory Effect of Ionospheric Electron Density in Response to Solar EUV Forcing

Geophysical Research Letters, Volume 53, Issue 14, 28 July 2026.
Abstract Precise characterization of the electron density profile is crucial for optimizing high frequency communications. Reconstruction models often assume an instantaneous ionospheric response to solar forcing or using time delays, neglecting the time‐integrated cumulative “memory effect” of plasma dynamics.
Hongwei Gong, Hanxian Fang, Die Duan, Chao Xiao, Jintai Li, Chenghao Li, Hongtao Huang, Ganming Ren, Chuyue Zhou, Han Wu   +9 more
wiley   +1 more source

Role of Sunspot Latitude versus Tilt in Determining the Polar Field and Amplitude of the Next Cycle: Cause of the Weak Solar Cycle 20

The Astrophysical Journal
One prominent feature of the solar cycle is its irregular variation in its cycle strength, making it challenging to predict the amplitude of the next cycle.
Bidisha Dey, Anu Sreedevi, Bidya Binay Karak   +2 more
doaj   +1 more source

Statistics of sunspot group clusters

Journal of Space Weather and Space Climate, 2013
The Zubrzycki method is utilized to find all sunspot groups which are close to each other during each Carrington rotation. The sunspot group areas and their positions for the years 1874–2008 are used.
Getko Ryszarda
doaj   +1 more source