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Solar rotational period of cosmic rays and solar activity during the maximum phase of solar cycle 24
Singh, A. K.; Singh, P. R.; Farid, A. I. Saad +2 more
To study the solar rotational oscillation on daily averaged time series of solar activity proxies: sunspot number (SSN), modified coronal index (MCI), solar flare index (FI), and cosmic ray intensity (CRI) are subjected to Lomb/Scargle periodogram, and continuous wavelet transform. For this purpose, we have used data of all the considered paramete…
Ab initio Wavelengths and Oscillator Strengths for Cl X
Karpuškienė, R.; Bogdanovich, P.; Martinson, I.
Using the configuration interaction technique, the energy spectra of 2s22p4, 2s2p5, 2s22p33s, 2s22p33p, and 2s22p33d configurations of oxygen-like chlorine Cl X have been calculated. The obtained data are used for the evaluation of wavelengths and oscillator strengths of all possible one-electron and two-electron 2s22p33p-2s2p5 electric dipole tra…
The Spectrum and Term System of S VII
Jupén, Christer; Engström, Lars
The spectrum of six times ionized sulphur, S VII, has been investigated in the wavelength region 200-4000Å by means of the beam-foil and laser-produced plasma techniques. The analysis comprises 219 lines of which 105 are newly identified. The present work establishes 123 2s22p5nl energy levels of which 66 are new. The level energies are determined…
Element Abundances in the Upper Atmospheres of the Sun and Stars: Update of Observational Results
Feldman, U.; Laming, J. M.
We review observational progress in the determination of element abundances in the solar corona, largely due to the new capabilities offered by the instrumentation on the SOHO satellite. Many new facets to coronal abundance anomalies with respect to the photosphere are revealed. This includes new results on the FIP (First Ionization Potential) Eff…