Astronomy and Astrophysics – Astronomy
Scientific paper
May 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005apj...624l.133t&link_type=abstract
The Astrophysical Journal, Volume 624, Issue 2, pp. L133-L136.
Astronomy and Astrophysics
Astronomy
26
Sun: Chromosphere, Sun: Magnetic Fields, Sun: Transition Region, Sun: Uv Radiation
Scientific paper
The radiance and Doppler-velocity maps of the emission lines of Si II, C IV, and Ne VIII obtained in a quiet region of the Sun by SUMER (Solar Ultraviolet Measurements of Emitted Radiation) are correlated with the vertical component, Bz, of the magnetic field vector as extrapolated, by means of a force-free field model, from the photospheric magnetic field measured by MDI (Michelson Doppler Imager). It is found that, with increasing vertical height, each of the correlation coefficients initially increases to a maximum value before it decreases again. The height corresponding to this maximum is called the correlation height. For the data sets selected from a quiet-Sun region, the correlation heights of Si II and C IV are near 2 Mm, and for Ne VIII near 4 Mm. At their correlation heights, the averaged square root of the radiance of the emission lines of Si II and C IV, considered as a proxy of the plasma density, has a linear relationship with Bz. This result supports the empirical concept that the solar transition region is very thin and still affected by frozen-in convection. A way for improvement of such studies is also outlined.
Marsch Eckart
Tu Chuan-Yi
Wang Jing-Xiu
Wilhelm Klaus
Xia Li-Dong
No associations
LandOfFree
Correlation Heights of the Sources of Solar Ultraviolet Emission Lines in a Quiet-Sun Region does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Correlation Heights of the Sources of Solar Ultraviolet Emission Lines in a Quiet-Sun Region, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Correlation Heights of the Sources of Solar Ultraviolet Emission Lines in a Quiet-Sun Region will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1701282