Catalogo Articoli (Spogli Riviste)

OPAC HELP

Titolo:
OBSERVED REDSHIFTS IN THE SOLAR TRANSITION REGION ABOVE ACTIVE AND QUIET REGIONS
Autore:
ACHOUR H; BREKKE P; KJELDSETHMOE O; MALTBY P;
Indirizzi:
UNIV OSLO,INST THEORET ASTROPHYS,POB 1029 N-0315 OSLO NORWAY
Titolo Testata:
The Astrophysical journal
fascicolo: 2, volume: 453, anno: 1995,
parte:, 1
pagine: 945 - 952
SICI:
0004-637X(1995)453:2<945:ORITST>2.0.ZU;2-4
Fonte:
ISI
Lingua:
ENG
Soggetto:
HIGH-RESOLUTION TELESCOPE; ULTRAVIOLET-SPECTRA; EXTREME-ULTRAVIOLET; FAR-ULTRAVIOLET; CORONAL LOOPS; FLUID MOTIONS; CHROMOSPHERE; FLOWS; DOWNFLOWS; EMISSION;
Keywords:
SUN, ACTIVITY; SUN, TRANSITION REGION; SUN, UV RADIATION;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
66
Recensione:
Indirizzi per estratti:
Citazione:
H. Achour et al., "OBSERVED REDSHIFTS IN THE SOLAR TRANSITION REGION ABOVE ACTIVE AND QUIET REGIONS", The Astrophysical journal, 453(2), 1995, pp. 945-952

Abstract

Solar UV spectral observations show a redshifted emission at temperatures between the chromosphere and the corona. We have measured the magnitude of the redshift as a function of the temperature using solar spectrograms from the High Resolution Telescope and Spectrograph-HRTS, The velocity derived from the average redshift is found to increase up to a temperature T approximate to 1.35 x 10(5) K in both quiet and active regions, then decrease with increasing temperature, with the rate of decrease depending critically on the laboratory wavelengths adoptedfor the transition region lines. This result illustrates the need forimproved laboratory measurements. We find that the differential redshift between an active region and the surroundings increases smoothly with temperature, reaches a maximum velocity difference of 7 km s(-1) at 1.35 x 10(5) K and falls abruptly to zero at 2.3 x 10(5) K. This observation is independent of the laboratory wavelengths. Suggestions regarding the origin of the redshift are confronted with the results.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 26/09/20 alle ore 05:40:03