Solar Physics

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ISSN / EISSN : 0038-0938 / 1573-093X
Published by: Springer Nature (10.1007)
Total articles ≅ 11,585
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, M. Gerontidou, H. Mavromichalaki, J. V. Rodriguez, M. Livada, M. K. Georgoulis, T. E. Sarris, V. Spanos, L. Dorman
Published: 15 June 2022
Solar Physics, Volume 297, pp 1-13; https://doi.org/10.1007/s11207-022-02009-1

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, N. S. Petrukhin
Published: 13 June 2022
Solar Physics, Volume 297, pp 1-13; https://doi.org/10.1007/s11207-022-02008-2

Abstract:
In this article we study the effect of a transitional layer in a magnetic tube on the real part of the frequencies of kink oscillations. In our analysis, we use the model of a straight magnetic tube with the density and cross-section radius varying along the loop, and the thin-tube thin-boundary (TTTB) approximation. First, we calculate the correction to the fundamental frequency and show that it is positive and of the order of the ratio of the transitional layer thickness to the loop radius $\ell $ . The increase in the fundamental frequency results in the decrease in the estimate of the magnetic-field magnitude. Then we study the effect of the transitional layer on the ratio between the fundamental frequency and the first overtone frequency that is used for estimating the atmospheric scale height. We show that the correction to the frequency ratio is of the order of $\ell ^{2}$2 , and thus it can be neglected for moderate values of $\ell $ .
Published: 1 June 2022
Solar Physics, Volume 297, pp 1-28; https://doi.org/10.1007/s11207-022-02001-9

Abstract:
The Solar Radiation and Climate Experiment/Spectral Irradiance Monitor (SORCE/SIM) instrument was launched on 25 January 2003 with mission termination occurring on 25 February 2020. The SORCE/SIM provides a unique data set of the variability in solar spectral irradiance (SSI) during the descending phase of Solar Cycle 23 (SC23) from April 2003 to February 2009, the weaker solar-maximum conditions of SC24, and the quiescent SC24/SC25 minimum. The determination of the magnitude and phase of SSI variations rely on the unambiguous determination of the effects of the space environment and solar-exposure-related degradation mechanisms. The instrument-only corrections for SIM are based on a comparison of two functionally identical (mirror image) prism spectrometers with four independent detectors in each spectrometer channel. The degradation correction is strictly instrumental in its methodology and makes no assumptions about the magnitude, slope, or wavelength dependence of the SSI variability.
, Hong Fu Qiang, Xue Ren Wang, Du Dou Wang, Yan Chao Wang, Lin Tao Zhang
Published: 31 May 2022
Solar Physics, Volume 297, pp 1-24; https://doi.org/10.1007/s11207-022-01999-2

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, Joshua Elliott
Published: 30 May 2022
Solar Physics, Volume 297, pp 1-18; https://doi.org/10.1007/s11207-022-01997-4

Abstract:
The X-ray Photometer System (XPS) is one of four instruments onboard NASA’s Solar Radiation and Climate Experiment (SORCE) mission. The SORCE spacecraft operated from 2003 to 2020 to provide key climate-monitoring measurements of total solar irradiance (TSI) and solar spectral irradiance (SSI). The XPS is a set of photometers to measure the solar X-ray ultraviolet (XUV) irradiance shortward of 34 nm and the bright hydrogen emission at 121.6 nm. Each photometer has a spectral bandpass of about 7 nm, and the XPS measurements have an accuracy of about 20%. The updates for the final data-processing algorithms for the XPS solar-irradiance data products are described. These processing updates include improvements for the instrumental corrections for background signal, visible-light signal, and degradation trending. Validation of these updates is primarily with measurements from a very similar XPS instrument onboard NASA’s Thermosphere-Ionosphere-Mesosphere-Energetics-Dynamics (TIMED) mission. In addition, the XPS Level 4 spectral model has been improved with new reference spectra derived with recent XUV observations from NASA’s Solar Dynamics Observatory (SDO) and Miniature X-ray Solar Spectrometer (MinXSS) cubesat.
Meng Yang, Xiaoying Gong, Yangyi Liu, Yu Tian,
Published: 25 May 2022
Solar Physics, Volume 297, pp 1-14; https://doi.org/10.1007/s11207-022-01993-8

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