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29 March 2024 |
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Article overview
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Soft X-Ray Observations of Quiescent Solar Active Regions using Novel Dual-zone Aperture X-ray Solar Spectrometer (DAXSS) | Bennet D. Schwab
; Robert H. A. Sewell
; Thomas N. Woods
; Amir Caspi
; James Paul Mason
; Christopher Moore
; | Date: |
26 Aug 2020 | Abstract: | The Dual-zone Aperture X-ray Solar Spectrometer (DAXSS) was flown on 2018
June18 on the NASA 36.336 sounding rocket flight and obtained the highest
resolution to date for solar soft X-ray (SXR) spectra over a broad energy
range. This observation was during a time with quiescent (non-flaring) small
active regions on the solar disk and when the 10.7 cm radio flux (F10.7) was 75
solar flux units (1 sfu = 10-22 W/m^2/Hz). The DAXSS instrument consists of a
LASP-developed dual-zone aperture and a commercial X-ray spectrometer from
Amptek that measures solar full-disk irradiance from 0.5-20 keV with a
resolving power of 20 near 1 keV. This paper discusses the novel design of the
spectrometer and the instrument characterization techniques. Additionally,the
solar measurements obtained from the 2018 sounding rocket flight are analyzed
using CHIANTI spectral models to fit the temperatures, emission measures, and
relative elemental abundances of the solar corona plasma. The abundance of iron
was found to be 35 percent higher than expected in the quiescent sun’s corona
suggesting either that our spectral models require additional sophistication or
that the underlying atomic database may require updates. Future long-term
systematic observations of this spectral range are needed. DAXSS will fly on
the INSPIRESat-1 CubeSat in late-2020, and its SXR spectral data could provide
further insight into the sources of coronal heating through modeling the
changes of relative elemental abundances during developments of active regions
and solar flaring events. | Source: | arXiv, 2008.11313 | Services: | Forum | Review | PDF | Favorites |
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