Accession Number : ADA267271


Title :   The Solar Cycle Variation of Coronal Temperature During Cycle 22


Corporate Author : PHILLIPS LAB HANSCOM AFB MA


Personal Author(s) : Guhathakurta, M ; Altrock, R C


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a267271.pdf


Report Date : Jan 1992


Pagination or Media Count : 6


Abstract : In this paper we describe preliminary results of a collaborative effort to characterize the temperature structure of the corona utilizing co- spatial spectrophotometric observations during ascending phase of solar cycle 22. The data. include ground-based intensity observations of the green (5303A Fe XIV) and red (6374 A Fe X) coronal lines from Sacramento Peak. A difficulty in attempting to characterize the state of the coronal plasma is that the temperature, the absolute chemical abundances, and the coronal density irregularities all affect the observed emission. However, in this analysis a determination of plasma, temperature T can be derived unambiguously from the intensity ratio Fe XIV/Fe X, since both the emission lines come from ionized states of Fe, and the ratios are only weakly dependent on density. The variation of the temperature within the ascending phase of solar cycle 22 will be discussed.... Solar Activity, Solar Cycle, Solar Corona.


Descriptors :   *SOLAR CYCLE , *SOLAR CORONA , EMISSION , REPRINTS , DENSITY , TEMPERATURE , PLASMAS(PHYSICS) , CORONAS , INTENSITY , CYCLES , VARIATIONS , IONIZATION , GROUND BASED , SOLAR ACTIVITY


Subject Categories : Astrophysics


Distribution Statement : APPROVED FOR PUBLIC RELEASE