Models of the Solar Chromosphere and Transition Region from SUMER and HRTS Observations: Formation of the Extreme‐Ultraviolet Spectrum of Hydrogen, Carbon, and Oxygen

An experiment is in course of preparation at the Astrophysics Research Unit at Culham for flight on a Sun-pointing rocket. It is designed to determine the ionization temperature and electron density as a function of height in the temperature range of about 8 × 104 K to 3 × 106 K by measuring limb to disk intensity ratios of extreme ultraviolet emission lines in the 170 to 850 Å region. The work is an extension of current experiments in which normal-incidence spectrographs are used to determine the structure lower in the chromosphere-corona transition region.

Download Full-text

HIRES: a high-resolution stigmatic extreme ultraviolet spectroheliometer for studies of the fine-scale structure of the solar chromosphere, transition region, and corona

Optical Engineering ◽

10.1117/12.55921 ◽

1991 ◽

Vol 30 (8) ◽

pp. 1142

Author(s):

J. Gethyn Timothy

Keyword(s):

High Resolution ◽

Transition Region ◽

Extreme Ultraviolet ◽

Scale Structure ◽

Solar Chromosphere ◽

Fine Scale

Download Full-text

The extreme ultraviolet spectrum of the sun

Space Science Reviews ◽

10.1007/bf00174027 ◽

1963 ◽

Vol 2 (1) ◽

Cited By ~ 141

Author(s):

Richard Tousey

Keyword(s):

Extreme Ultraviolet ◽

Ultraviolet Spectrum ◽

The Sun

Download Full-text

Extreme-Ultraviolet Spectrum of N iv*

Journal of the Optical Society of America ◽

10.1364/josa.61.000625 ◽

1971 ◽

Vol 61 (5) ◽

pp. 625 ◽

Cited By ~ 15

Author(s):

D. J. Michels ◽

S. G. Tileord ◽

J. W. Quinn

Keyword(s):

Extreme Ultraviolet ◽

Ultraviolet Spectrum

Download Full-text

THE HIGH-RESOLUTION EXTREME-ULTRAVIOLET SPECTRUM OF N2 BY ELECTRON IMPACT

Proceedings of the 69th International Symposium on Molecular Spectroscopy ◽

10.15278/isms.2014.fe03 ◽

2014 ◽

Author(s):

Alan Heays ◽

Stephen Gibson ◽

Brenton Lewis ◽

Alejandro Aguilar ◽

Joe Ajello

Keyword(s):

High Resolution ◽

Electron Impact ◽

Extreme Ultraviolet ◽

Ultraviolet Spectrum

Download Full-text

Hot prominence spicules launched from turbulent cool solar prominences

Astronomy and Astrophysics ◽

10.1051/0004-6361/201936027 ◽

2019 ◽

Vol 627 ◽

pp. L5 ◽

Cited By ~ 2

Author(s):

L. P. Chitta ◽

H. Peter ◽

L. Li

Keyword(s):

Transition Region ◽

Extreme Ultraviolet ◽

The Sun ◽

Solar Dynamics Observatory ◽

Solar Prominences ◽

Solar Filament ◽

Solar Dynamics ◽

Ultraviolet Observations ◽

Hot Corona ◽

Shed Light

A solar filament is a dense cool condensation that is supported and thermally insulated by magnetic fields in the rarefied hot corona. Its evolution and stability, leading to either an eruption or disappearance, depend on its coupling with the surrounding hot corona through a thin transition region, where the temperature steeply rises. However, the heating and dynamics of this transition region remain elusive. We report extreme-ultraviolet observations of quiescent filaments from the Solar Dynamics Observatory that reveal prominence spicules propagating through the transition region of the filament-corona system. These thin needle-like jet features are generated and heated to at least 0.7 MK by turbulent motions of the material in the filament. We suggest that the prominence spicules continuously channel the heated mass into the corona and aid in the filament evaporation and decay. Our results shed light on the turbulence-driven heating in magnetized condensations that are commonly observed on the Sun and in the interstellar medium.

Download Full-text