Results 41 to 50 of about 18,154 (212)

High Dielectronic Satellite Lines in Solar Flare Iron Spectra [PDF]

International Astronomical Union Colloquium, 1977
New calculations have been carried out in intermediate coupling of the wavelengths and intensities of the Fe XXIV transitions ls2nℓ-ls2pnℓ with n ≥ 3.It is shown that some of these lines are situated on the short wave-length side of the helium-like Fe XXV resonance transition.
F. Bely-Dubau, A.H. Gabriel, S. Volontè
openaire   +1 more source

Impact of Solar Irradiance on Storm‐Time Thermospheric Mass Density Response

Geophysical Research Letters, Volume 53, Issue 6, 28 March 2026.
Abstract As a key parameter in the externally forced ionosphere–thermosphere (IT) system, mass density response to storms is affected by the prevailing solar irradiance. To better understand this relationship, we examine mass density responses to the same storm but with different background solar irradiance levels.
Simin Zhang, Liying Qian, Nicholas Pedatella, Eric Sutton, Noah Peterson, Thomas Berger   +5 more
wiley   +1 more source

A window into magnetic reconnection: IRIS observations of the consequences of reconnection during solar flares

Frontiers in Astronomy and Space Sciences, 2022
Magnetic reconnection is a dynamic process that occurs in solar flares in a tenuous and hot environment. High-cadence, high-spatial resolution spectroscopic observations with the Interface Region Imaging Spectrometer (IRIS) have provided a unique window ...
Katharine K. Reeves
doaj   +1 more source

Hydrogen Balmer Line Broadening in Solar and Stellar Flares [PDF]

, 2017
The broadening of the hydrogen lines during flares is thought to result from increased charge (electron, proton) density in the flare chromosphere. However, disagreements between theory and modeling prescriptions have precluded an accurate diagnostic of ...
Allred, Joel C., Brown, Stephen, Carlsson, Mats, Hawley, Suzanne L., Kowalski, Adam F., Osten, Rachel A., Tremblay, Pier-Emmanuel, Uitenbroek, Han, Wisniewski, John P.   +8 more
core   +2 more sources

Mesospheric and Lower Thermospheric Responses to the May 2024 Geomagnetic Storm in the Antarctic Peninsula

Geophysical Research Letters, Volume 53, Issue 6, 28 March 2026.
Abstract We analyze the response of mean winds and semidiurnal tides (SDTs) in the mesosphere and lower thermosphere (MLT; ∼70–110 km altitude) to the May 2024 geomagnetic super storm, based on meteor radar (MR) observations from King Sejong Station (KSS; geographic: 62.22°S, 58.78°W; geomagnetic: 53.27°S, 10.88°E) in the Antarctic Peninsula.
Byeong‐Gwon Song, In‐Sun Song, Masaru Kogure, Geonhwa Jee, Jeong‐Han Kim, Changsup Lee, Eunsol Kim, Young‐Bae Ham, Hosik Kam   +8 more
wiley   +1 more source

Analysis of Solar Microwave Burst Spectrum, I. Nonuniform Magnetic

Journal of Astronomy and Space Sciences, 2018
Solar microwave bursts carry information about the magnetic field in the emitting region as well as about electrons accelerated during solar flares. While this sensitivity to the coronal magnetic field must be a unique advantage of solar microwave burst
Jeongwoo Lee
doaj   +1 more source

Stellar Coronae, Solar Flares: a Detailed Comparison of sigma Gem, HR 1099, and the Sun in High-resolution X-rays

, 2013
Chandra HETG spectra of the coronally active binary stars sigma Gem and HR 1099 are among the highest fluence observations for such systems taken at high spectral resolution in x-rays with this instrument.
Huenemoerder, David P., Phillips, Kenneth J. H., Sylwester, Barbara, Sylwester, Janusz   +3 more
core   +1 more source

Monte Carlo Simulation of 3D Cloud Radiance Distributions Affected by Ground‐Based Lighting

Journal of Geophysical Research: Atmospheres, Volume 131, Issue 6, 28 March 2026.
Abstract Satellite observations of artificial light sources at night are increasing. Clouds, as the most important radiative modulators in the Earth‐atmosphere system, significantly influence the observed values and spatial distribution of the artificial light coming from the ground.
Huixin Sun, Shensen Hu, Weihua Ai, Shuo Ma   +3 more
wiley   +1 more source

Fast electron slowing-down and diffusion in a high temperature coronal X-ray source [PDF]

, 2005
Finite thermal velocity modifications to electron slowing-down rates may be important for the deduction of solar flare total electron energy. Here we treat both slowing-down and velocity diffusion of electrons in the corona at flare temperatures, for the
A. L. MacKinnon, Brown, Brown, E. P. Kontar, Emslie, Emslie, Hoyng, Kane, Kontar, Lin, Lin, Lin, MacKinnon, McClements, P. Helander, Piana, R. K. Galloway, Rosenbluth, Saint-Hilaire, Schwartz, Smith   +20 more
core   +3 more sources

Altitude Dependence of Hard X-Ray Spectra in Solar Flares [PDF]

Proceedings of the International Astronomical Union, 2006
We investigate the altitude dependence of hard X-ray (HXR) spectra in solar flares, i.e., whether the HXR spectra are related to the altitudes of reconnection sites. We assume that the reconnection altitude can be scaled by the distance between the two conjugate HXR footpoints in the flare.
Q. R. Chen, M. D. Ding, P. F. Chen
openaire   +1 more source