Results 121 to 130 of about 1,877,814 (242)

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

On the Effects of the Solar Wind Structure in the Global Distribution of dBH/dt ${\text{dB}}_{H}/\text{dt}$ Spikes During Geomagnetic Storms

Journal of Geophysical Research: Space Physics, Volume 131, Issue 9, September 2026.
Abstract Variations in the solar wind, particularly those associated with interplanetary coronal mass ejections (ICMEs) and high‐speed streams (HSSs), drive geomagnetic disturbances that produce rapid changes in the ground magnetic field. These variations, commonly quantified by the time derivative of the horizontal magnetic field dBH/dt $\left({\text ...
José P. Marchezi, Amy Keesee, Michael Coughlan, Raman Mukundan, Victor Pinto, Ligia A. Da Silva, Livia R. Alves, Hyunju Connor, Don Hampton   +8 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
core  

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

Statistical Scale Analyses of a Diurnal Periodicity in Auroral Kilometric Radiation, Observed by Wind/WAVES

Journal of Geophysical Research: Space Physics, Volume 131, Issue 9, September 2026.
Abstract The Earth's strongest natural radio emission is Auroral Kilometric Radiation (AKR), which is correlated with auroral intensity, and is a barometer for space weather. AKR is generated by the electron cyclotron maser instability, with sources on auroral field lines. Previous work on AKR and radio emissions from other planets (or stars) points to
Alexandra Ruth Fogg, S. Wu, C. M. Jackman, S. J. Walker, M. J. Rutala, C. K. Louis, S. M. Ivanov, L. Lamy, J. E. Waters, D. K. Whiter   +9 more
wiley   +1 more source

Robust Machine Learning–Based Ionospheric Delay Grid Modeling for PPP‐RTK Under Sparse Reference Stations and Severe Geomagnetic Disturbance

Space Weather, Volume 24, Issue 9, September 2026.
Abstract Sparse reference station networks and severe geomagnetic disturbances can significantly degrade the accuracy of regional ionospheric delay modeling at the network side, thereby reducing the positioning performance of PPP‐RTK. To address this issue, this study proposes a machine learning‐based ionospheric delay grid modeling method that finely ...
Linyu He, Weiping Jiang, Hua Chen, Xingyu Zhou, Tianjun Liu, Jie He, Jie Ding   +6 more
wiley   +1 more source

Iono‐PhyTAU: A Lightweight Global Ionospheric TEC Prediction Model Based on Temporal Attention Unit and Physical Condition Constraints of the Ionosphere

Space Weather, Volume 24, Issue 9, September 2026.
Abstract Ionospheric Total Electron Content (TEC) is the primary error source causing signal delay in Global Navigation Satellite Systems (GNSS). High‐precision TEC prediction is essential for positioning, navigation, and space weather monitoring. Although deep learning models including ConvLSTM, ConvGRU, and Transformer have advanced TEC forecasting ...
Yiling Gui, Yajun Xu, Song Jia, Miaomiao Wang, Boyang Hao, Xinjie Wu   +5 more
wiley   +1 more source

Did Space Weather Delay the 10:05 p.m. Train Departure From Exeter on 18 October 1841?

Space Weather, Volume 24, Issue 9, September 2026.
Abstract Although the Carrington Event of 1859 is typically cited as the first extreme space weather event of the scientific era, it is not the earliest example of modern human technology being impacted by geomagnetic activity. The literature includes reliable accounts of disturbances to telegraph equipment during geomagnetic storms dating to the late ...
James A. Wild, Ciaran D. Beggan, David H. Boteler, William B. Cade III, Brett A. Carter, Michael Hapgood   +5 more
wiley   +1 more source

The oscillatory response of the electroretinogram and neuronal adaptation

Acta Ophthalmologica, Volume 104, Issue 6, Page 616-637, September 2026.
Abstract After more than 50 years, there still remains a challenge and an interest to know more as well as extend and deepen our understanding of the small rapid wavelets, the oscillatory potentials (OPs), of the electroretinogram (ERG) and the neuronal adaptation of the retina.
Lillemor Wachtmeister, Anders Eklund
wiley   +1 more source

Sedimentary Ancient DNA Tracks Multi‐Kingdom Ecosystem Reorganizations Following Sequential Human Land Use at Crawford Lake

Molecular Ecology, Volume 35, Issue 17, September 2026.
ABSTRACT Crawford Lake has an exceptional stratigraphic record that began recording biannual (varved) sedimentation in the lake basin ~750 years ago, preserving evidence of shifting cultural zones and agricultural practices, from Late Woodland Period Indigenous agriculturalists to the impacts of industrialization during the late 19th century.
Tyler J. Murchie, Matthew V. Emery, Scott L. Cocker, Libby Natola, Melanie Kuch, Linda Y. Rutledge, Francine McCarthy, Michael F. J. Pisaric, Hendrik N. Poinar   +8 more
wiley   +1 more source