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

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 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 Comparing the main oscillation characteristics in the solar chromosphere and magnetosphere based on studies made in ISTP SB RAS

2018 ◽  
Vol 4 (4) ◽  
pp. 14-22
Author(s):  
Максим Челпанов ◽  
Maksim Chelpanov ◽  
Андрей Челпанов ◽  
Andrey Chelpanov ◽  
Николай Кобанов ◽  
...  
Keyword(s):  
Solar Wind ◽  
Interplanetary Space ◽  
Alfven Wave ◽  
Solar Chromosphere ◽  
Earth's Magnetosphere ◽  
The Media ◽  
Line Widths ◽  
Chromospheric Line ◽  
Oscillation Characteristics ◽  
Made In

The aim of this paper is to structure and extend the knowledge of solar chromospheric sources of oscillations in the solar wind and their relationships with pulsations registered in the magnetosphere. We compare the oscillation spectra that we observe using instruments of the Institute of Solar-Terrestrial Physics in different chromospheric structures with those observed in the solar wind and magnetosphere. We explore the possibility that the observed periodic variations of the chromospheric line widths can be interpreted as torsional Alfvén wave manifestation—this mode can propagate long distances without dissipating in the interplanetary space; it can penetrate into Earth’s magnetosphere directly or due to processes occurring at the plasmapause. We emphasize the similarities in the oscillation characteristics observed in different media, the similarities in the parameters of the media themselves and the processes developing in them. We believe that similar approaches can be applied to studying these media.

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.

Sign in / Sign up

Export Citation Format

Share Document