Temperatures of the disturbed and quiet inner solar corona

Journal Article · Wed May 01 04:00:00 EDT 1985 · Sov. Astron. (Engl. Transl.); (United States)

OSTI ID:6200679

Nikol'skaya, K I

The temperature composition of four coronal disturbances (CD) and the quiet inner corona of different epochs is investigated on the basis of eclipse observations of the coronal optical spectrum within the framework of concepts of the solar corona in quiet and active regions as consisting of elementary arches of different temperatures containing material of the same density. Three of the CD consisted of two components, a hot coronal condensation (a Ca XV region) with T/sub e/roughly-equal3.8 x 10/sup 6/ K and an Ni XV region with T/sub e/roughly-equal2.3 x 10/sup 6/ K; the contribution of the former to the total CD emission was from 14 to 23% while the weighted-mean temperature was T/sub e/ = (2.5--2.6) x 10/sup 6/ K. Two of the CD (Feb. 25, 1952, and July 31, 1981) had an identical temperature composition, despite the difference in their spectra and other characteristics. Considerable spatial variations of temperature composition occur in the quiet inner corona. On the average, Fe XIV regions (T/sub e/ = 1.9 x 10/sup 6/ K) dominate in approx.1/3 of the undisturbed corona in the minimum phase and Ni XV regions (T/sub e/ = 2.3 x 10/sup 6/ K) dominate in approx.2/3, while the average temperature composition lies in the range of Ni XV:Fe XIV:Fe X = (0.42:0.38:0.20) -(0.78:0.18:0.04). Variations of the average temperature composition of the quiet corona with the solar activity cycle are traced: The fraction of the Ni XV region grows from 0.60 at the minimum to 0.83 at the maximum with variation of the weighted-mean temperature from 2.1 x 10/sup 6/ to 2.2 x 10/sup 6/ K.

• Research Organization: Institute of Terrestrial Magnetism, the Ionosphere, and Radio-Wave Propagation, USSR Academy of Sciences
• OSTI ID: 6200679
• Journal Information: Sov. Astron. (Engl. Transl.); (United States), Journal Name: Sov. Astron. (Engl. Transl.); (United States) Vol. 29:3; ISSN SAAJA
• Country of Publication: United States
• Language: English

Related Subjects

640104* -- Astrophysics & Cosmology-- Solar Phenomena
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ATMOSPHERES
CALCIUM IONS
CHARGED PARTICLES
DISTURBANCES
ECLIPSE
ELECTROMAGNETIC RADIATION
IONS
IRON IONS
MAIN SEQUENCE STARS
NICKEL IONS
RADIATIONS
SOLAR ACTIVITY
SOLAR CORONA
STARS
STELLAR ATMOSPHERES
STELLAR CORONAE
SUN
TEMPERATURE MEASUREMENT
VISIBLE RADIATION