Pregled bibliografske jedinice broj: 1265619
Coronal Holes Versus Normal Quiet Sun Observed with SUMER
Coronal Holes Versus Normal Quiet Sun Observed with SUMER // Astrophysics and Space Science, 264 (1998), 1/4; 53-61 doi:10.1023/a:1002484307087 (međunarodna recenzija, članak, znanstveni)
CROSBI ID: 1265619 Za ispravke kontaktirajte CROSBI podršku putem web obrasca
Naslov
Coronal Holes Versus Normal Quiet Sun Observed with SUMER
Autori
Stucki, Katja ; Solanki, Sami Khan ; Rüedi, Isabelle ; Stenflo, Jan Olof ; Brković, Alen ; Schühle, Udo ; Wilhelm, Klaus ; Huber, Martin Christoph Emanuele
Izvornik
Astrophysics and Space Science (0004-640X) 264
(1998), 1/4;
53-61
Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni
Ključne riječi
Sun: coronal hole
Sažetak
We present a preliminary analysis of spectral lines obtained with the SUMER instrument (Solar Ultraviolet Measurements of Emitted Radiation) onboard the Solar and Heliospheric Observatory (SOHO), as observed during three observing campaigns. From the 70 observed spectral lines, we selected 12, representing 9 ions or atoms, in order to analyse line intensities, shifts and widths in polar coronal holes as well as in the normal quiet Sun. We find that coronal lines show a distinct blueshift in coronal holes relative to the quiet Sun at equal heliospheric angle, while there is no evidence for such a shift for lines formed at temperatures below 100 000K. The widths of lines formed at temperatures above 30 000 K are slightly increased inside the coronal hole, but unaffected for lower temperatures. Intensity measurements clearly show the center-to-limb variation, as well as an intensity diminution inside the coronal hole for lines formed above approximately 100 000 K.
Izvorni jezik
Engleski
Znanstvena područja
Fizika
Citiraj ovu publikaciju:
Časopis indeksira:
- Current Contents Connect (CCC)
- Web of Science Core Collection (WoSCC)
- Science Citation Index Expanded (SCI-EXP)
- SCI-EXP, SSCI i/ili A&HCI
- Scopus
