Results 91 to 100 of about 1,152,990 (233)

First Global Machine Learning Model to Predict the Rate of TEC Index (ROTI) Response to X‐Class Solar Flares

Space Weather
Solar flares are bursts of electromagnetic radiation originating in the Sun's atmosphere. Solar flares cause a rapid increase in ionization in the ionosphere, resulting in radio signal interference.
A. Mahmoudian, F. Ghorbali, M. Vazifehkhah Hafteh   +2 more
doaj   +1 more source

Statistical analysis of short-wave fadeout for extreme space weather event estimation

Earth, Planets and Space, 2020
Solar flares trigger an increase in plasma density in the ionosphere including the D region, and cause the absorption of radio waves, especially in high-frequency (HF) ranges, called short-wave fadeout (SWF).
Chihiro Tao, Michi Nishioka, Susumu Saito, Daikou Shiota, Kyoko Watanabe, Naoto Nishizuka, Takuya Tsugawa, Mamoru Ishii   +7 more
doaj   +1 more source

Premature Reentry of the Binar CubeSats Due To Underestimation of Solar and Geomagnetic Activities and Its Implication for Importance of Medium‐ and Long‐Term Space Weather Forecasts

Space Weather, Volume 23, Issue 12, December 2025.
Abstract The rapid development of low‐Earth orbit (LEO) satellites brings increased attention to spacecraft collisions, space debris, orbital decay, and satellite reentry. Neutral density and associated drag force on the satellite orbits elevate space risks, significantly determined by space weather disturbances, particularly geomagnetic storms.
Xin Wang, Ronglan Wang, Kunpeng Wang, Zhitao Yang, Tingling Ren, Jifeng Cao, Ming Li, Siqing Liu, Bingxian Luo, Chi Wang   +9 more
wiley   +1 more source

The Mars Topside Ionosphere Response to the X8.2 Solar Flare of 10 September 2017

Geophysical Research Letters, 2018
On 10 September 2017, irradiance from a magnitude X8.2 solar flare impacted Mars while the Mars Atmosphere and Volatile EvolutioN (MAVEN) orbiter was characterizing the Mars upper atmosphere.
E. Thiemann, L. Andersson, R. Lillis, P. Withers, S. Xu, M. Elrod, Shraddha Jain, M. Pilinski, D. Pawlowski, P. Chamberlin, F. Eparvier, M. Benna, C. Fowler, S. Curry, W.K. (Bill) Peterson, J. Deighan   +15 more
semanticscholar   +1 more source

Detection of Three-minute Oscillations in Full-disk Lyα Emission during a Solar Flare [PDF]

, 2017
In this Letter we report the detection of chromospheric 3-minute oscillations in disk-integrated EUV irradiance observations during a solar flare. A wavelet analysis of detrended Lyα (from GOES/EUVS) and Lyman continuum (from Solar Dynamics Observatory ...
R. Milligan, B. Fleck, J. Ireland, L. Fletcher, B. Dennis   +4 more
semanticscholar   +1 more source

Hemispheric comparison of solar flare associated cosmic noise absorption (SCNA) from high latitude stations: Maitri (70.75°S, 11.75°E) and Abisko (68.4°N, 18.9°E)

Frontiers in Astronomy and Space Sciences
The effects of solar flares in the D-region ionosphere at two high-latitude stations: Maitri (70.75°S, 11.75°E) and Abisko (68.4°N, 18.9°E), located in different hemispheres are studied. We analyzed 37 M-class flares and 6 X-class flares of the year 2014,
Shipra Sinha, Shipra Sinha, Geeta Vichare, A. K. Sinha   +3 more
doaj   +1 more source

The Impact of the 2024 Mother's Day Storm on Aircraft Surveillance Across Europe

Space Weather, Volume 23, Issue 12, December 2025.
Abstract The Mother's day storm from 10–13 May 2024 is one of the most extreme space weather events recorded in recent decades and triggered a strong ionospheric response with various impacts on communication and navigation systems. In this study the impact on the aviation sector, and more specifically air traffic management, is investigated with ...
Erik Schmölter, Jens Berdermann
wiley   +1 more source

Solar Flare Activity, 1937–2024: Introducing the New Hemispheric Solar Flare Index (hSFI) in the Context of 2024's Major Solar Storm Events

Space Weather
A new daily composite of the solar flare index (SFI) and the hemispherically‐resolved versions (hSFI) are presented for 1937 to 2024. The data set confirms that the northern hemisphere (NH) dominated solar flare activity during Solar Cycles 17 to 21, but
V. M. Velasco Herrera, W. Soon, S. Knoška, A. Özgüç, G. Velasco Herrera, H. Yeşilyaprak, N. Babynets, M. Švanda, J. Muraközy, S. Qiu, D. Riveros‐Rosas, R. Connolly, M. Connolly, A. Tlatov, L. Cappellotto   +14 more
doaj   +1 more source

Quantification of Perturbation to the Daytime Lower Ionosphere From a Gamma Ray Burst Using ELF Remote Sensing

Geophysical Research Letters, Volume 52, Issue 22, 28 November 2025.
Abstract On 9 October 2022, a powerful gamma ray burst (GRB), GRB221009A, caused significant changes in the electron density of the lower ionosphere, as evidenced by VLF (3–30 kHz) radio wave observations. However, GRB221009A did not yield any observable signatures at the Schumann resonances (∼8, ∼14 Hz), which are also sensitive to the lower ...
M. Gołkowski, Z. Nieckarz, J. Mlynarczyk, M. Ostrowski, J. Kubisz, A. Michalec, J. Lichtenberger, A. Klekociuk, P. Nicholson   +8 more
wiley   +1 more source

Observations and Modeling of the Mars Low‐Altitude Ionospheric Response to the 10 September 2017 X‐Class Solar Flare

Geophysical Research Letters, 2018
Solar extreme ultraviolet and X‐ray photons are the main sources of ionization in the Martian ionosphere and can be enhanced significantly during a solar flare.
Shaosui Xu, E. Thiemann, D. Mitchell, F. Eparvier, D. Pawlowski, M. Benna, L. Andersson, M. Liemohn, S. Bougher, C. Mazelle   +9 more
semanticscholar   +1 more source