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28 March 2024 |
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New Solar Irradiance Measurements from the Miniature X-Ray Solar Spectrometer CubeSat | Thomas N. Woods
; Amir Caspi
; Phillip C. Chamberlin
; Andrew Jones
; Richard Kohnert
; James Paul Mason
; Christopher S. Moore
; Scott Palo
; Colden Rouleau
; Stanley C. Solomon
; Janet Machol
; Rodney Viereck
; | Date: |
6 Oct 2016 | Abstract: | The goal of the Miniature X-ray Solar Spectrometer (MinXSS) CubeSat is to
explore the energy distribution of soft X-ray (SXR) emissions from the
quiescent Sun, active regions, and during solar flares, and to model the impact
on Earth’s ionosphere and thermosphere. The energy emitted in the SXR range
(0.1 to 10 keV) can vary by more than a factor of 100, yet we have limited
spectral measurements in the SXRs to accurately quantify the spectral
dependence of this variability. The MinXSS primary science instrument is an
Amptek, Inc. X123 X-ray spectrometer that has an energy range of 0.5-30 keV
with a nominal 0.15 keV energy resolution. Two flight models have been built.
The first, MinXSS-1, has been making science observations since 2016 June 9,
and has observed numerous flares, including 40 C-class and 7 M-class flares.
These SXR spectral measurements have advantages over broadband SXR
observations, such as providing the capability to derive multiple-temperature
components and elemental abundances of coronal plasma, improved irradiance
accuracy, and higher resolution spectral irradiance as input to planetary
ionosphere simulations. MinXSS spectra obtained during the M5.0 flare on 2016
July 23 highlight these advantages, and indicate how the elemental abundance
changes from primarily coronal to more photospheric during the flare. MinXSS-1
observations are compared to the Geostationary Operational Environmental
Satellite (GOES) X-Ray Sensor (XRS) measurements of SXR irradiance and
estimated corona temperature. Additionally, a suggested improvement to the
calibration of the GOES XRS data is presented. | Source: | arXiv, 1610.1936 | Services: | Forum | Review | PDF | Favorites |
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