✦ LIBER ✦

Behavior of transition-region lines during impulsive solar flares

✍ Scribed by E. Tandberg-Hanssen; E. Reichmann; B. Woodgate

Publisher: Springer
Year: 1983
Tongue: English
Weight: 546 KB
Volume: 86
Category: Article
ISSN: 0038-0938
DOI: 10.1007/bf00157184

No coin nor oath required. For personal study only.

✦ Synopsis

We describe briefly the Ultraviolet Spectrometer and Polarimete on the Solar Maximum Mission and discuss data pertaining to the emissions observed in lines originating in the transition-region plasma, particularly during impulsive flares.

The data pertain to lines from the following ions: Sill, CIV, OIV, SilV, OV, and FeXXI.

📜 SIMILAR VOLUMES

Observations of the Caxixresonance line

Observations of the Caxixresonance line during the impulsive phase of solar flares

✍ K. G. McClements; D. Alexander 📂 Article 📅 1989 🏛 Springer 🌐 English ⚖ 909 KB

Numerical simulations of flaring coronal loops, based on the assumption of an electron beam energy input, show that material is ablated from the chromosphere at approximately the local sound speed, thus giving rise to an overall blueshift in the spectrum of the soft X-ray Ca xIx resonance line of up

Relaxation of ions during the impulsive

Relaxation of ions during the impulsive phase of solar flares

✍ Gui-fu Chen; Yong-nian Huang 📂 Article 📅 1989 🏛 Elsevier Science 🌐 English ⚖ 325 KB

Cyclotron lines in the spectra of solar

Cyclotron lines in the spectra of solar flares and solar active regions

✍ V. V. Zheleznyakov; E. Ya. Zlotnik 📂 Article 📅 1989 🏛 Springer 🌐 English ⚖ 387 KB

It was shown by Zheleznyakov and Zlotnik (1980a, b) that in complex configurations of solar magnetic fields (in hot loops above the active centres, in neutral current sheets in the preflare phase, in hot X-ray kernels in the initial flare phase) a system of cyclotron lines in the spectrum of microwa

The relation between hard X-ray and tran

The relation between hard X-ray and transition-region line emission in solar flares

✍ John T. Mariska; A. I. Poland 📂 Article 📅 1985 🏛 Springer 🌐 English ⚖ 810 KB

Observational evidence suggests that both the hard X-ray and ultraviolet emission from the impulsive phase of flares result from an electron beam. We present the results of model calculations that are consistent with this theory. The impulsive phase is envisioned as occurring in many small magnetica

Periodic behavior of solar flare index d

Periodic behavior of solar flare index during solar cycles 20 and 21

✍ Atila Özgüç; Tamer Ataç 📂 Article 📅 1989 🏛 Springer 🌐 English ⚖ 434 KB

Short-term periodicities of solar activity were studied with the flare index by using Discrete Fourier Transform for the time interval 1966-1986. Two noticeable periodicities (18.5 and 5 months) have been found. The existence of these periodicities comparing with the early findings is discussed.

On the hard X-ray spatial structure duri

On the hard X-ray spatial structure during the impulsive phase of solar flares

✍ A. Gordon Emslie; Marcos E. Machado 📂 Article 📅 1987 🏛 Springer 🌐 English ⚖ 346 KB

Using a simplified form of the bremsstrahlung cross-section, we obtain an analytic expression for the intensity of electron-beam-produced hard X-ray emission with depth in solar flares. The results show that 'footpoint' emission is more likely than previously thought, and we discuss these results in