Results 121 to 130 of about 9,915 (239)

Daytime Ionospheric F‐Region Topside Irregularities Associated With Significant Density Enhancement at Low Latitudes During the 12 November 2025 Magnetic Storm

Geophysical Research Letters, Volume 53, Issue 10, 28 May 2026.
Abstract In this study, daytime F‐region irregularities were observed at low latitudes during the main phase of the 12 November 2025 strong magnetic storm, causing intense very high frequency radar echoes ranging hundreds of kilometers in altitude.
Wenjie Sun, Guozhu Li, Guofeng Dai, Haiyong Xie, Lianhuan Hu, Biqiang Zhao, Zequan Wang, Jianfei Liu, Xiukuan Zhao, Yi Li, Baiqi Ning   +10 more
wiley   +1 more source

On the detectability of solar X-ray flares using very low frequency sudden phase anomalies

, 2015
We have studied ionization excesses produced by enhancements of X-ray emission during solar flares using the very low frequency (VLF) response of the lower edge of the ionospheric D region.
Kaufmann, P, Pacini, AA, Martinez, MAG, Raulin, JP, Correia, E   +4 more
core   +1 more source

First Quantitative Results on the Response of Green and Red Line Dayglow Emissions to Solar Flares of Different Magnitudes

Geophysical Research Letters
Flares originate from the impulsive release of magnetic energy in the solar atmosphere. The rise in X‐ray flux enhances ionization/electron content in the upper atmosphere, modifying the photochemical and dynamical processes that govern the ionosphere ...
Komal, Duggirala Pallamraju
doaj   +1 more source

Super active regions and production of major solar flares

, 1986
The success of imaging detectors with small fields of veiw such as HXIS or P/OF (Pinhole/Occulter Facility) depends heavily on pointing to the right place at the right time.
Bai, T.
core  

Multispectral Study Of Major Solar Flares Toward Flares Predictions [PDF]

, 2018
Major solar flares (X-class) are the most dangerous solar activities for the Earth in terms of space weather. It is due to a magnetic eruption and sudden release of intense magnetic energy at active regions (AR). The main objective of this research is to
Roslan, Muhamad Akram Zaki
core  

Ultraviolet and extreme-ultraviolet emissions at the flare footpoints observed by atmosphere imaging assembly

, 2013
A solar flare is composed of impulsive energy release events by magnetic reconnection, which forms and heats flare loops. Recent studies have revealed a two-phase evolution pattern of UV 1600 Å emission at the feet of these loops: a rapid pulse lasting ...
Klimchuk, J.A., Longcope, D.W., Liu, W.-J., Sturrock, Z., Qiu, J.   +4 more
core   +1 more source

Electron beams in solar flares

, 1994
A list of publications resulting from this program includes 'The Timing of Electron Beam Signatures in Hard X-Ray and Radio: Solar Flare Observations by BATSE/Compton Gamma-Ray Observatory and PHOENIX'; 'Coherent-Phase or Random-Phase Acceleration of ...
Aschwanden, Markus J., Benz, Arnold O., Dennis, Brian R.   +2 more
core  

Indeterminacy and instability in Petschek reconnection

, 2013
We explain two puzzling aspects of Petschek's model for fast reconnection. One is its failure to occur in plasma simulations with uniform resistivity. The other is its inability to provide anything more than an upper limit for the reconnection rate.
Litvinenko, Yuri E., Yuri E. Litvinenko, Priest, Eric R., Priest, E.R., Litvinenko, Y.E., Forbes, T.G., Forbes, Terry G., Eric R. Priest, Daniel B. Seaton, Seaton, Daniel B., Seaton, D.B., Terry G. Forbes   +11 more
core   +1 more source

Rapid fluctuations in solar flares

, 1986
Study of rapid fluctuations in the emission of radiation from solar flares provides a promising approach for probing the magneto-plasma structure and plasma processes that are responsible for a flare.
Sturrock, Peter A.
core  

Statistical Studies on the Excess Peak Flux in Soft X-rays and EUV Bands from Solar Flares

, 2012
Based on the solar X-ray data in the band of 0.1 -aEuro parts per thousand 0.8 nm observed by Geostationary Operational Environmental Satellites (GOES), the XUV and EUV data in the bands of 26 -aEuro parts per thousand 34 nm and 0.1 -aEuro parts per ...
Cai, L., Ercha, A., Xiao, Z., Zhang, D. H., Hao, Y. Q.   +4 more
core   +1 more source