Results 71 to 80 of about 1,559,234 (209)
MHD simulations of coronal heating [PDF]
, 2015 The problem of heating the solar corona requires the conversion of magnetic energy into thermal energy. Presently, there are two promising mechanisms for heating the solar corona: wave heating and nanoflare heating.
Tam, Kuan V.
core +2 more sources
Solar Vortex Tubes. III. Vorticity and Energy Transport
The Astrophysical JournalThis study investigated the mechanisms of vorticity generation and the role of vortex tubes in plasma heating and energy transport. Vortex tubes were identified using the instantaneous vorticity deviation technique in the MURaM data set of a simulated ...
Suzana S. A. Silva +7 more
doaj +1 more source
High frequency oscillations in the solar chromosphere and their connection with heating [PDF]
Proceedings of the International Astronomical Union, 2007 AbstractHigh frequency acoustic waves have been suggested as a source of mechanical heating in the quiet solar chromosphere. To investigate this, we have observed intensity oscillations of several lines in the frequency interval 1.64-70mHz using data from the VTT Tenerife and the Dunn Solar Telescope at the National Solar Observatory.
Aleksandra Andic +4 more
openaire +1 more source
Nowcasting Solar EUV Irradiance With Photospheric Magnetic Fields and the Mg II Index
Space Weather, Volume 22, Issue 4, April 2024.Abstract A new method to nowcast spectral irradiance in extreme ultraviolet (EUV) and far ultraviolet (FUV) bands is presented here, utilizing only solar photospheric magnetograms and the Mg II index (i.e., the core‐to‐wing ratio). The EUV and FUV modeling outlined here is a direct extension of the SIFT (Solar Indices Forecasting Tool) model, based on ...
Kara L. Kniezewski +2 more
wiley +1 more source
High-frequency Transverse Waves in Chromospheric Fibrils Revealed by DKIST
The Astrophysical JournalChromospheric fibrils are ubiquitous dynamical structures that can support magnetohydrodynamic waves and may contribute to energy transport in the solar atmosphere.
Qifan Dong +6 more
doaj +1 more source
Coronal Heating and Solar Wind Generation by Flux Cancellation Reconnection
The Astrophysical Journal, 2023 In this paper, we propose that flux cancellation on small granular scales (≲1000 km) ubiquitously drives reconnection at a multitude of sites in the low solar atmosphere, contributing to chromospheric/coronal heating and the generation of the solar wind.
D. I. Pontin +3 more
doaj +1 more source
A static model of chromospheric heating in solar flares
The Astrophysical Journal, 1983 The response of the solar chromosphere to flare processes, namely nonthermal electrons, thermal conduction, and coronal pressure, is modeled. Finite difference methods employing linearization and iteration are used in obtaining simultaneous solutions to the equations of steady-state energy balance, hydrostatic equilibrium, radiative transfer, and ...
P. J. Ricchiazzi, R. C. Canfield
openaire +1 more source
Probabilistic Short‐Term Solar Driver Forecasting With Neural Network Ensembles
Space Weather, Volume 22, Issue 3, March 2024.Abstract Space weather indices are used to drive forecasts of thermosphere density, which directly affects objects in low‐Earth orbit (LEO) through atmospheric drag force. A set of proxies and indices (drivers), F10.7, S10.7, M10.7, and Y10.7 are used as inputs by the JB2008, (https://doi.org/10.2514/6.2008‐6438) thermosphere density model.
Joshua D. Daniell, Piyush M. Mehta
wiley +1 more source
Height-dependent Slow Magnetoacoustic Wave Amplitude and Energy Flux in Sunspot Atmospheres
The Astrophysical JournalSlow magnetoacoustic waves (SMAWs) have been considered a possible candidate for chromospheric heating in the past. This study analyzed 20 active regions observed between 2012 and 2016 to examine the amplitude and energy flux variation of SMAWs in the ...
Y. Sanjay +2 more
doaj +1 more source
Origin of Small-scale Evaporation Flows Deep in the Chromosphere During a Solar Flare
The Astrophysical Journal LettersFlares are caused by an abrupt release of magnetic energy in the solar atmosphere. Plasma heated to well over 10 MK filling the postflare corona originates from a rapid heating and ablation of the cooler chromospheric material.
L. P. Chitta +31 more
doaj +1 more source