Results 121 to 130 of about 16,469 (214)

Enhancing Geomagnetic Disturbance Predictions with Neural Networks: A Case Study on K-Index Classification

Atmosphere
To explore the application of neural networks for estimating geomagnetic field disturbances, this study pays particular attention to K-index classification.
Aizhan Altaibek, Beibit Zhumabayev, Aiganym Sarsembayeva, Marat Nurtas, Diana Zakir   +4 more
doaj   +1 more source

Decadal‐Scale In Situ Scanning of a Stalagmite From Southwest China Reveals Blake Geomagnetic Excursion Structure

Geophysical Research Letters, Volume 53, Issue 2, 28 January 2026.
Abstract We present a decadal‐scale paleomagnetic analysis of a stalagmite collected from Shuixi Cave, southwest China, spanning 89−123 ka. Our findings include: (a) Magnetite is the dominant magnetic mineral, and paleomagnetic directions can be obtained via demagnetization; (b) Magnetic scanning at 0.1‐mm resolution captures key magnetic features ...
Zhongshan Shen, Youwei Li, Liang Yi, Huafeng Qin, Jian Wang, Yibing Li, Hai Cheng   +6 more
wiley   +1 more source

Wavelet Analyses of Geomagnetic Data regarding Major Geomagnetic Disturbances

Journal of Environmental Science and Engineering B, 2021
null Laurentiu Asimopolos, null Natalia-Silvia Asimopolos, null Adrian Aristide Asimopolos   +2 more
openaire   +1 more source

Ionospheric Variations Associated, with Geomagnetic Disturbances

Journal of geomagnetism and geoelectricity, 1953
Variations in the densities and heights of the ionospheric Es and F2 regions during magnetic storms are studied. At the moderate latitudes in summer solstice and at the equatorial zone, the disturbance variation of the Es in both local time (SD) and storm time (Dst) is obtained by statistical examination, although the individual values of the Es data ...
openaire   +2 more sources

Plasma Conditions Govern the Reversible Transition Between STEVE and Picket Fence Emissions

Geophysical Research Letters, Volume 53, Issue 2, 28 January 2026.
Abstract On 6 May 2018, a remarkable subauroral optical event exhibiting three phases of evolution (Strong Thermal Emission Velocity Enhancement [STEVE] → Picket Fence → STEVE) and co‐occurrence with a stable auroral red arc was observed over Alberta, Canada.
Jinghan Wang, Jing Liu, Jun Liang, Shuhan Li   +3 more
wiley   +1 more source

Origin of Intense Plasma Depletions After Midnight Over the Korean Peninsula During the Geomagnetic Storm on 11 May 2024

Geophysical Research Letters, Volume 53, Issue 2, 28 January 2026.
Abstract A band of total electron content (TEC) depletions of about 5–15 TEC unit passed over the Korean Peninsula after midnight during the geomagnetic storm on 11 May 2024. This magnitude of TEC depletions has not been previously reported in the region.
Hyosub Kil, Se‐Heon Jeong, Woo Kyoung Lee, Junseok Hong, Septi Perwitasari, Michi Nishioka, Prayitno Abadi   +6 more
wiley   +1 more source

Observations of vertical winds and the origin of thermospheric gravity waves launched by auroral substorms and westward travelling surges [PDF]

Several sequences of observations of strong vertical winds in the upper thermosphere are discussed, in conjunction with models of the generation of such winds. In the auroral oval, the strongest upward winds are observed in or close to regions of intense
Rees, D.
core   +1 more source

Polar geomagnetic disturbance [PDF]

Geophysical Journal of the Royal Astronomical Society, 2007
openaire   +1 more source

Direct Observational Evidence of the Mesoscale Gravity Wave Modulations on Low‐Latitude Sporadic E Layer

Geophysical Research Letters, Volume 53, Issue 2, 28 January 2026.
Abstract Sporadic E (Es) layer plays essential role in ionosphere‐atmosphere coupling. Theoretical simulations show that the atmospheric gravity waves (GWs) in the lower thermosphere are the main modulatory source on Es dynamics at small spatial scales and short periods.
Junyi Wang, Xinan Yue, Xu Zhou, Yihui Cai, Feng Ding, Jorge L. Chau, David C. Fritts, Juha Vierinen, Alan Z. Liu, Baiqi Ning   +9 more
wiley   +1 more source

Observation of Synchronization Between Instabilities of the Sporadic E Layer and Geomagnetic Field Line Connected F Region Medium-Scale Travelling Ionospheric Disturbances [PDF]

, 2019
Akinori Saito, Chiao‐Yao She, Katsuhiko Tsuno, Makoto Abo, Michi Nishioka, Mitsumu K. Ejiri, Satoshi Wada, Takanori Nishiyama, Takayo Ogawa, Takuji Nakamura, Takuo T. Tsuda, Takuya D. Kawahara, Toru Takahashi   +12 more
core   +2 more sources