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Full-Text Articles in Physical Sciences and Mathematics
Mapping The Distribution Of Electron Temperature And Fe Charge States In The Corona With Total Solar Eclipse Observations, Shadia Rifai Habbal, Miloslav Druckmüller, Huw Morgan, Adrian Daw, Judd Johnson, A. Ding, Martina Arndt, R. Esser, V. Rusin, I. Scholl
Mapping The Distribution Of Electron Temperature And Fe Charge States In The Corona With Total Solar Eclipse Observations, Shadia Rifai Habbal, Miloslav Druckmüller, Huw Morgan, Adrian Daw, Judd Johnson, A. Ding, Martina Arndt, R. Esser, V. Rusin, I. Scholl
Physics Faculty Publications
The inference of electron temperature from the ratio of the intensities of emission lines in the solar corona is valid only when the plasma is collisional. Once collisionless, thermodynamic ionization equilibrium no longer holds, and the inference of an electron temperature and its gradient from such measurements is no longer valid. At the heliocentric distance where the transition from a collision-dominated to a collisionless plasma occurs, the charge states of different elements are established, or frozen-in. These are the charge states which are subsequently measured in interplanetary space. We show in this study how the 2006 March 29 and 2008 …
Total Solar Eclipse Observations Of Hot Prominence Shrouds, Shadia Rifai Habbal, Miloslav Druckmüller, Huw Morgan, I. Scholl, V. Rusin, Adrian Daw, Judd Johnson, Martina B. Arndt
Total Solar Eclipse Observations Of Hot Prominence Shrouds, Shadia Rifai Habbal, Miloslav Druckmüller, Huw Morgan, I. Scholl, V. Rusin, Adrian Daw, Judd Johnson, Martina B. Arndt
Physics Faculty Publications
Using observations of the corona taken during the total solar eclipses of 2006 March 29 and 2008 August 1 in broadband white light and in narrow bandpass filters centered at Fe x 637.4 nm, Fe xi 789.2 nm, Fe xiii 1074.7 nm, and Fe xiv 530.3 nm, we show that prominences observed off the solar limb are enshrouded in hot plasmas within twisted magnetic structures. These shrouds, which are commonly referred to as cavities in the literature, are clearly distinct from the overlying arch-like structures that form the base of streamers. The existence of these hot shrouds had been predicted …