![]() |
Figure 1:
The E140H spectrum of ![]() |
Open with DEXTER |
![]() |
Figure 2: Blow-up of the regions containing the S V 1199.134 Å line (panel a)), the O V 1218 & 1371 Å lines (panels b) and c)), and the Fe IV quadruplet between 1601.5 and 1606.5 Å (panel d)). Of this quadruplet we could measure only the 1602 Å line. Light-ink labels in panel d) indicate the positions of the missed Fe IV lines. The symbol * in panels a) and c) marks the absorption components due to the interstellar medium. In all of the panels the wavelength scale has been shifted according to the stellar radial velocity. |
Open with DEXTER |
![]() |
Figure 3: A double-peak structure identified as the S I at 1241.9 Å and the Fe XII 1242 Å lines. |
Open with DEXTER |
![]() |
Figure 4:
Plots of interesting portions of the ![]() |
Open with DEXTER |
![]() |
Figure 5: The Si III, N V, Si IV, and C IV line profiles. The narrow and broad dashed lines indicate the narrow and broad Gaussian components, respectively, required to best fit the broad wings of these transition region lines. The vertical solid and dashed lines indicate the centroids of the narrow and broad Gaussians, respectively. |
Open with DEXTER |
![]() |
Figure 6:
Doppler shifts of chromospheric and transition region lines of ![]() |
Open with DEXTER |
![]() |
Figure 7: Nonthermal velocities of chromospheric and transition region lines as function of the temperature of line formation. The solid line represents a third order polynomial fit to the data. Lines which are possibly affected by opacity (Fe II, Si II, and C II) are not included in the polynomial fit ( square data points). The dotted and dashed lines represent the nonthermal line widths in a solar active region and in the quiet Sun, respectively, as derived by Teriaca et al. (1999). |
Open with DEXTER |
![]() |
Figure 8:
Ratios of the solar to ![]() |
Open with DEXTER |
![]() |
Figure 9:
Ratios of the solar to ![]() |
Open with DEXTER |
![]() |
Figure 10:
Plots of interesting portions of the ![]() ![]() |
Open with DEXTER |
![]() |
Figure 11:
The L-function curves (as defined by Landi & Landini 1998) plotted for
the O IV, S IV, and O V 1218 and 1371 Å lines
observed in the STIS spectrum of ![]() |
Open with DEXTER |
![]() |
Figure 12:
The differential
emission measure distribution of ![]() ![]() |
Open with DEXTER |
![]() |
Figure 13: The S IV] 1406 Å line (panel a)) and the N IV] 1486 Å line (panel b)) discussed in Sect. 7. |
Open with DEXTER |