Results 51 to 60 of about 1,347 (224)

Coronal loop hydrodynamics [PDF]

Astronomy & Astrophysics, 2001
A&A, in press, 6 pages, 5 ...
Betta, R. M., Peres, G., Reale, F., Serio, S.   +3 more
openaire   +2 more sources

Searching for Rotational X‐Ray Modulation on TIC 277539431

Astronomische Nachrichten, Volume 347, Issue 3, March 2026.
ABSTRACT TIC 277539431, a fast rotating M7 dwarf, was detected to host the highest latitude flare to date at 81°$$ {81}^{{}^{\circ}} $$. Magnetic activity like stellar flares occurring at high latitude indicate occurrence of coronal loops at these latitudes on fully‐convective M dwarfs. In contrast, sunspots usually occur below 30°$$ {30}^{{}^{\circ}} $
Desmond Dsouza, Katja Poppenhäger, Ekaterina Ilin   +2 more
wiley   +1 more source

Observations of Temporal Variations in the 5303 Å Emission Line During a Coronal Mass Ejection Without Any Associated Solar Flare

The Astrophysical Journal
Reports 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, R. Ramesh, Jagdev Singh, K. Sasikumar Raja   +3 more
doaj   +1 more source

Estimating Geomagnetically Induced Currents in High‐Voltage Power Lines for the Territory of Kazakhstan

Space Weather, 2023
Extreme solar events, such as powerful solar flares are accompanied by the release of strong solar disturbances, such as coronal mass ejections (CMEs). The impact of CMEs on the Earth's magnetosphere causes geomagnetic storms, which trigger geomagnetic ...
A. B. Andreyev, S. N. Mukasheva, V. I. Kapytin, O. I. Sokolova   +3 more
doaj   +1 more source

Analysis of the solar coronal green line profiles from eclipse observations

, 2013
Analysis of the solar coronal green line profiles reveals information regarding the physical conditions of the solar corona like temperature, density, Doppler velocity, non-thermal velocity etc. It provides insights to the unresolved problems like the coronal heating and the acceleration of the solar winds.
Prabhakar, Maya, Raju, K. P., Chandrasekhar, T.   +2 more
openaire   +2 more sources

Strong Polar Ionospheric Electron Density Depletion Under Prolonged Northward IMF Bz Condition

Earth and Space Science, Volume 13, Issue 3, March 2026.
Abstract Previous studies have primarily focused on high‐latitude ionospheric‐thermospheric (I‐T) variabilities under southward interplanetary magnetic field (IMF) conditions, while rare studies have investigated the I‐T responses to due northward Bz (NBz), especially in the presence of strong IMF By conditions.
Tianyu Cao, Yifan Lu, Jing Liu, Shuhan Li   +3 more
wiley   +1 more source

New Results on the Onset of a Coronal Mass Ejection from 5303 Å Emission Line Observations with VELC/ADITYA-L1

The Astrophysical Journal Letters
We 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, V. Muthu Priyal, Jagdev Singh, K. Sasikumar Raja, P. Savarimuthu, Priya Gavshinde   +5 more
doaj   +1 more source

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, Katharine K. Reeves, Yingna eSu   +2 more
doaj   +1 more source

Periodic Density Structures Observed in Ulysses Data: First Results

Journal of Geophysical Research: Space Physics, Volume 131, Issue 3, March 2026.
Abstract Periodic density structures (PDSs) are advecting quasi‐periodic (periodicities between several minutes and several hours) density enhancements observed in the solar wind and corona. There is strong evidence that PDSs are formed at the Sun.
Brent M. Randol, Nicholeen Viall, Larry Kepko, Simone Di Matteo   +3 more
wiley   +1 more source

Reconnection Nanojets in an Erupting Solar Filament with Unprecedented High Speeds

The Astrophysical Journal Letters
Solar nanojets are small-scale jets generated by component magnetic reconnection, characterized by collimated plasma motion perpendicular to the reconnecting magnetic field lines.
Yuhang Gao, Hui Tian, David Berghmans, Yadan Duan, Tom Van Doorsselaere, Hechao Chen, Emil Kraaikamp   +6 more
doaj   +1 more source