Transition region line-shifts in the rebound shock spicule model

1994 ◽  
Vol 70 (1-2) ◽  
pp. 103-106 ◽  
Author(s):  
V. H. Hansteen ◽  
�. Wikst�l
Keyword(s):  
Transition Region ◽  
Region Line

scholarly journals Reappraising Transition Region Line Widths in Light of Recent Alfvén Wave Discoveries

2008 ◽  
Vol 673 (2) ◽  
pp. L219-L223 ◽  
Author(s):  
Scott W. McIntosh ◽  
Bart De Pontieu ◽  
Theodore D. Tarbell
Keyword(s):  
Transition Region ◽  
Alfven Wave ◽  
Line Widths ◽  
Region Line

scholarly journals Far-Ultraviolet and Visible Observations of Flares on dme Stars

1983 ◽  
Vol 71 ◽  
pp. 245-248
Author(s):  
G E Bromage ◽  
B E Patchett ◽  
K J H Phillips
Keyword(s):  
Solar Flare ◽  
Transition Region ◽  
The Other ◽  
Ev Lac ◽  
Far Ultraviolet ◽  
Large Flare ◽  
Region Line ◽  
Line Strengths

ABSTRACTFour large flare events – one on each of the dMe stars UV Cet, AT Mic, EV Lac and EQ Peg – have been witnessed during a total of 17½ hours of far-UV (λλ1150-1950) IUE exposures. Some observational characteristics of these four events are compared. Two showed strong enhancements of chromospheric and transition-region line strengths. The other two did not, even though their visible flares were intense (ΔU ~ 2 mag). The brightest UV flare spectrum (EQ Peg) is contrasted with that of the largest solar flare seen from ‘Skylab’.

scholarly journals Stellar X-Ray Activity in the Hyades

1983 ◽  
Vol 71 ◽  
pp. 131-134
Author(s):  
Robert A. Stern ◽  
Marie-Christine Zolcinski
Keyword(s):  
Binary System ◽  
Transition Region ◽  
X Ray ◽  
Spectroscopic Binary ◽  
Hyades Cluster ◽  
Solar Type ◽  
High Level ◽  
Einstein Observatory ◽  
Region Line

Observations of the Hyades cluster with the Einstein Observatory and with IUE have uncovered a high level of coronal x-ray emission (Lx≃1029 era s-1 for solar-type stars) and similarly high fluxes of chromospheric and transition region line fluxes compared to the gun (Stern et al.1981, Zolcinski et al. 1981, 1982). A giant x-ray flare from a spectroscopic binary system in the Hyades has also been reported (Stern, Antiochos and Underwood 1982).

Extreme‐Ultraviolet Transition‐Region Line Emission during the Dynamic Formation of Prominence Condensations

2001 ◽  
Vol 547 (2) ◽  
pp. 1116-1129 ◽  
Author(s):  
Antonino F. Lanza ◽  
Daniele Spadaro ◽  
Alessandro C. Lanzafame ◽  
Spiro K. Antiochos ◽  
Peter J. MacNeice ◽  
...  
Keyword(s):  
Transition Region ◽  
Extreme Ultraviolet ◽  
Line Emission ◽  
Dynamic Formation ◽  
Region Line

The relation between hard X-ray and transition-region line emission in solar flares

Solar Physics ◽  
1985 ◽  
Vol 96 (2) ◽  
pp. 317-330 ◽  
Author(s):  
John T. Mariska ◽  
A. I. Poland
Keyword(s):  
Transition Region ◽  
Solar Flares ◽  
Line Emission ◽  
X Ray ◽  
Region Line

scholarly journals The IUE Observations Of W UMa

1982 ◽  
Vol 69 ◽  
pp. 309-315
Author(s):  
S.M. Rucinski ◽  
J.E. Pringle ◽  
J.A.J. Whelan
Keyword(s):  
Transition Region ◽  
Emission Feature ◽  
Low Resolution ◽  
Active Systems ◽  
Line Intensities ◽  
Ion Formation ◽  
Massive Component ◽  
Orbital Periods ◽  
Region Line ◽  
Good Agreement

AbstractThe low resolution, phase averaged SWP spectra reveal the trend of increased transition-region line intensities for higher temperatures of ion formation which was previously observed for other active systems. Two series of low resolution LWR spectra covering two full orbital periods have been used to check the photometric results from the ANS satellite and a good agreement is found for the 2200 Å band. Wavelength shifts and changes in the intensity of the blended Mg II emission feature are not inconsistent with the ANS result that the more massive component is the more active one in the W UMa system.

scholarly journals Evaluating Possible Heating Mechanisms Using the Transition Region Line Profiles of Late‐Type Stars

1997 ◽  
Vol 478 (2) ◽  
pp. 745-765 ◽  
Author(s):  
Brian E. Wood ◽  
Jeffrey L. Linsky ◽  
Thomas R. Ayres
Keyword(s):  
Transition Region ◽  
Line Profiles ◽  
Late Type ◽  
Region Line

scholarly journals Non-Maxwellian Analysis of the Transition-region Line Profiles Observed by theInterface Region Imaging Spectrograph

2017 ◽  
Vol 842 (1) ◽  
pp. 19 ◽  
Author(s):  
Jaroslav Dudík ◽  
Vanessa Polito ◽  
Elena Dzifčáková ◽  
Giulio Del Zanna ◽  
Paola Testa
Keyword(s):  
Transition Region ◽  
Line Profiles ◽  
Imaging Spectrograph ◽  
Region Line

Effects of Ambipolar Diffusion on Prominence Thread Models

1994 ◽  
Vol 144 ◽  
pp. 315-321 ◽  
Author(s):  
M. G. Rovira ◽  
J. M. Fontenla ◽  
J.-C. Vial ◽  
P. Gouttebroze
Keyword(s):  
Energy Balance ◽  
Transition Region ◽  
Ambipolar Diffusion ◽  
Line Profiles ◽  
Balance Equations ◽  
Model Calculations ◽  
Partial Frequency ◽  
Frequency Redistribution ◽  
Partial Frequency Redistribution ◽  
Theoretical Structure

AbstractWe have improved previous model calculations of the prominence-corona transition region including the effect of the ambipolar diffusion in the statistical equilibrium and energy balance equations. We show its influence on the different parameters that characterize the resulting prominence theoretical structure. We take into account the effect of the partial frequency redistribution (PRD) in the line profiles and total intensities calculations.

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