Results 51 to 60 of about 1,306 (183)
The Astrophysical JournalReports using total solar eclipse data indicate that the 5303 Å emission line is a promising tool for observing the thermodynamic changes due to coronal mass ejections (CMEs) close to the Sun.
V. Muthu Priyal +3 more
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On the Lyman-alpha and Lyman-beta lines in solar coronal streamers
, 2006 We investigate the formation of the H I Lyman-alpha and Lyman-beta lines in an equatorial coronal streamer. Particular attention is paid to frequency redistribution for the scattering of the incident radiation. The properties of the spectral lines are studied.
Labrosse, Nicolas, Li, Xing, Li, Bo
openaire +2 more sources
Neutral‐Line Magnetic Shear and Enhanced Coronal Heating in Solar Active Regions [PDF]
The Astrophysical Journal, 1997 By examining the magnetic structure at sites in the bright coronal interiors of active regions that are not flaring but exhibit persistent strong coronal heating, we establish some new characteristics of the magnetic origins of this heating. We have examined the magnetic structure of these sites in five active regions, each of which was well observed ...
D. A. Falconer +4 more
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An Ionospheric Storm Scale Index Based on TEC: Comparative Analysis for China Region
Space Weather, Volume 24, Issue 8, August 2026.Abstract Defining a standardized ionospheric storm scale is challenging given the ionosphere's inherent complexity and susceptibility to multiple driving factors. In this study, a novel ionospheric storm scale (ISS) index is developed based on statistical analysis of total electron content (TEC) data from 257 ground‐based GNSS stations across China ...
Shuangshuang Shi +8 more
wiley +1 more source
The Astrophysical Journal LettersWe report on the onset of a coronal mass ejection (CME) using spectroscopic observations in the 5303 Å coronal emission line with the Visible Emission Line Coronagraph (VELC) onboard ADITYA-L1, the recently launched first Indian space solar mission.
R. Ramesh +5 more
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Predicting Geomagnetic Activity in the Ascending and Declining Phases of the Solar Cycle
Space Weather, Volume 24, Issue 8, August 2026.Abstract Most predictions of space climate, that is, the long‐term behavior of the solar‐terrestrial environment, have focused on forecasting the 11‐year sunspot cycle. Geomagnetic activity, on the other hand, has mainly been predicted in shorter, space weather timescales of up to days to weeks.
Timo Qvick +2 more
wiley +1 more source
Reconnection Nanojets in an Erupting Solar Filament with Unprecedented High Speeds
The Astrophysical Journal LettersSolar nanojets are small-scale jets generated by component magnetic reconnection, characterized by collimated plasma motion perpendicular to the reconnecting magnetic field lines.
Yuhang Gao +6 more
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Evidence for a Magnetic Flux Rope in Observations of a Solar Prominence-Cavity System
Frontiers in Astronomy and Space Sciences, 2016 Coronal cavities are regions of low coronal emission that usually sit above solar prominences. These systems can exist for days or months before erupting.
Patricia R. Jibben +2 more
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Space Weather, Volume 24, Issue 8, August 2026.Abstract Large ionospheric disturbances were observed over Europe during the extreme geomagnetic storm on 10 May 2024. This study analyzes GNSS‐derived total electron content (TEC) and all‐sky imager data to investigate these disturbances. Pronounced TEC enhancements, irregularities, and strong gradients were confined to the auroral region above the ...
Grzegorz Nykiel +5 more
wiley +1 more source
Infrared Dual-line Hanle diagnostic of the Coronal Vector Magnetic Field
Frontiers in Astronomy and Space Sciences, 2016 Measuring the coronal vector magnetic field is still a major challenge in solar physics. This is due to the intrinsic weakness of the field (e.g. ~4G at a height of 0.1Rsun above an active region) and the large thermal broadening of coronal emission ...
Gabriel Ionel Dima +4 more
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