Results 71 to 80 of about 285 (167)
IRIS2+: A Comprehensive Database of Stratified Thermodynamic Models in the Low Solar Atmosphere
The Astrophysical Journal Supplement SeriesWe present the most comprehensive collection of stratified-in-optical-depth thermodynamic models of the lower solar atmosphere. This database, named IRIS ^2+ , consists of 40,320 synthetic representative profiles (RPs) and their corresponding ...
Alberto Sainz Dalda +3 more
doaj +1 more source
High-order Paschen Emission from the Quiet-Sun Off-limb Chromosphere
The Astrophysical Journal LettersWe report the detection of high-order hydrogen Paschen emission lines (Pa 15, Pa 16, and Pa 17) in the quiet-Sun chromosphere off the solar limb using the Chromospheric Infrared SpectroPolarimeter (SCIP) on board the Sunrise iii balloon telescope.
Haocheng Yu +33 more
doaj +1 more source
The Astrophysical Journal LettersAcoustic waves propagate into the chromosphere, contributing to energy transport and their dynamics. Their upward propagation is restricted to frequencies above the acoustic cutoff frequency.
Takayoshi Oba +39 more
doaj +1 more source
The Astrophysical Journal, 1990 The observed form of the emission measure (EM) is used as a function of temperature to infer the wave energy flux density and pressure throughout the lower transition region (TR). This procedure eliminates the need for specifying how the wave energy flux density is damped and addresses the question of whether there is any form of the mechanical heating
D. Tod Woods +2 more
openaire +1 more source
The Plasma β in Quiet Sun Regions: Multi-instrument View
The Astrophysical JournalA joint campaign of several spaceborne and ground-based observatories, such as the GREGOR solar telescope, the Extreme-ultraviolet Imaging Spectrometer (EIS), and the Interface Region Imaging Spectrograph (Hinode Observing Plan 381, 2019 October 11–22 ...
Jenny M. Rodríguez-Gómez +6 more
doaj +1 more source
Observational Evidence of Solar Spicules Associated with Microfilament Eruptions Using DKIST
The Astrophysical Journal LettersThe formation mechanism of spicules is fundamentally important for understanding mass and energy transport from the chromosphere into the corona. Recent studies suggested that spicules may be powered by microfilament eruptions.
Qifan Dong +10 more
doaj +1 more source
Astronomy & AstrophysicsContext. The solar chromosphere is a dynamic and crucial interface between the solar interior and its interplanetary environment, regulating how energy is locally deposited into heat and transported into the upper atmospheric layers.
Noraz Q., Carlsson M., Aulanier G.
doaj +1 more source
Statistical Investigation of Wave Propagation in the Quiet-Sun Using IRIS Spectroscopic Observations
The Astrophysical JournalIn this analysis, we use spectroscopic observations of the quiet Sun made by the IRIS instrument and investigate wave propagation. We analyze various spectral lines formed in different atmospheric layers, such as the photosphere, chromosphere, and ...
Kartika Sangal +4 more
doaj +1 more source
Height-dependent Phase Shifts of Wave Pulses in the Lower Solar Atmosphere Measured with Sunrise iii
The Astrophysical Journal LettersWe report on the measurement of the height-dependent time shifts of wave pulses in the lower solar atmosphere from high-resolution spectropolarimetric observations obtained with the SUSI instrument on board the S unrise iii balloon-borne solar ...
Andreas Lagg +34 more
doaj +1 more source
Slab model of the Hanle effect for magnetically sensitive chromospheric lines
Astronomy & AstrophysicsAims. We address the need to model the effects of radiation anisotropy and atomic coherence on the Stokes profiles of magnetically sensitive lines formed in the solar chromosphere.
Afonso Delgado D., Casini R., Centeno R.
doaj +1 more source