Zobrazeno 1 - 10
of 386
pro vyhledávání: '"Astrophysics - Solar and Stellar Astrophysics"'
Publikováno v:
Solar Physics. 298
The abundances of low First Ionisation Potential (FIP) elements are three to four times higher (FIP bias) in the closed loop active corona than in the photosphere, known as the FIP effect. Observations suggest that the abundances vary in different co
Autor:
Albert, Kinga, Hirzberger, Johann, Castellanos Durán, J. Sebastián, Orozco Suárez, David, Woch, Joachim, Michalik, Harald, Solanki, Sami K.
Publikováno v:
Solar Physics. 298
This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) a
Autor:
F. Clette, L. Lefèvre, T. Chatzistergos, H. Hayakawa, V. M. S. Carrasco, R. Arlt, E. W. Cliver, T. Dudok de Wit, T. K. Friedli, N. Karachik, G. Kopp, M. Lockwood, S. Mathieu, A. Muñoz-Jaramillo, M. Owens, D. Pesnell, A. Pevtsov, L. Svalgaard, I. G. Usoskin, L. van Driel-Gesztelyi, J. M. Vaquero
Publikováno v:
Solar Physics. 298
We report progress on the ongoing recalibration of the Wolf sunspot number (SN) and Group sunspot number (GN) following the release of version 2.0 of SN in 2015. This report constitutes both an update of the efforts reported in the 2016 Topical Issue
Publikováno v:
Solar Physics. 298
Recent results of Singh et al. (2016) show that the emergence of an active region (AR) can be seen in a strengthening of the f-mode power up to two days prior of the region's formation. In the original work, ring diagram analysis was used to estimate
Autor:
Alissandrakis, C. E., Vial, J. -C.
Publikováno v:
Solar Physics. 298
We study point-like explosive events (EE), characterized by emission in the far wings of spectral lines, in a quiet region near the South Pole, using Interface Region Imaging Spectrograph (IRIS) spectra at two slit positions, slit-jaw (SJ) observatio
Autor:
Andrei Chelpanov, Nikolai Kobanov
Publikováno v:
Solar Physics. 297
Registering periodic variations of spectral line widths serves as the main method for observing torsional Alfvén waves. Theoretically, the method seems valid, yet it entails a number of caveats when applied to data. For instance, the amplitudes of t
Publikováno v:
Solar Physics. 297
The problem of bias, meaning over- or underestimation, of the component perpendicular to the line-of-sight, Bperp, in vector magnetic field maps is discussed. Previous works on this topic have illustrated that the problem exists; here we perform nove
Autor:
Marian Karlicky, Jan Benáček
Publikováno v:
Solar Physics. 297
Solar radio zebras are used in the determination of the plasma density and magnetic field in solar flare plasmas. Analyzing observed zebra stripes and assuming their generation by the double-plasma resonance (DPR) instability, high values of the gyro
Autor:
Nagaraju K, Raveena Khan
Publikováno v:
Solar Physics. 297
The diagnostic capabilities of spectral lines in far ultraviolet (FUV) and extreme ultraviolet (EUV) wavelength range are explored in terms of their Hanle and Zeeman sensitivity to probe vector magnetic field in the solar corona. The temperature rang
Autor:
Peter Young, Ignacio Ugarte-Urra
Publikováno v:
Solar Physics. 297
The Extreme ultraviolet Imaging Spectrometer (EIS) on board the Hinode spacecraft has been operating since 2006, returning high resolution data in the 170-212 and 246-292 A wavelength regions. EIS has four slit options, with the narrow 1" and 2" slit