Scholarlink

<p>Cross-calibration of X-ray instruments is crucial for stereoscopic studies of solar hard X-ray directivity and three-dimensional morphology, where spectral and imaging differences observed from multiple perspectives provide critical constraints. We present the preliminary results of the spectral calibrations of ASO-S/HXI through internal consistency checks of its three total flux detectors and cross-calibrations with Solar Orbiter/STIX, Fermi/GBM, and Konus-Wind data. Both calibration tests suggest that the response matrix of one of the HXI total flux monitors, D94 (with a thin aluminum window), needs to be modified. The new response matrix is determined by testing the series of response matrices with changing effective aluminum thickness through simulations. Post-correction analysis reveals <InlineEquation ID="IEq1"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="11207_2025_2465_Article_IEq1.gif" Format="GIF" Height="16" Rendition="HTML" Resolution="72" Type="Linedraw" Width="49" /> </InlineMediaObject> <EquationSource Format="MATHML"><math> <mo>∼</mo> <mn>88</mn> <mi mathvariant="normal">%</mi> </math></EquationSource> <EquationSource Format="TEX">$\sim 88\%$</EquationSource> </InlineEquation> of co-observed events demonstrate electron spectral index consistency within <InlineEquation ID="IEq2"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="11207_2025_2465_Article_IEq2.gif" Format="GIF" Height="14" Rendition="HTML" Resolution="72" Type="Linedraw" Width="37" /> </InlineMediaObject> <EquationSource Format="MATHML"><math> <mo>±</mo> <mn>0.5</mn> </math></EquationSource> <EquationSource Format="TEX">$\pm 0.5$</EquationSource> </InlineEquation>, while comparisons of the total counts above 30&#xa0;keV show &lt; 10% differences for STIX-HXI flares with separation angles &lt; 20°&#xa0;and Fermi-observed moderate flares. Though challenges persist regarding detector response uncertainties, the pile-up effect, and other nonideal factors, the achieved inter-instrument consistency enables quantitative electron anisotropy investigations through joint spectral analysis.</p>

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Spectral Cross-Calibrations of ASO-S/HXI with Other X-ray Missions

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年4月25日

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  • Zhentong Li,
  • Yang Su,
  • Wei Liu,
  • Wei Chen,
  • Fu Yu,
  • Weiqun Gan

摘要

Cross-calibration of X-ray instruments is crucial for stereoscopic studies of solar hard X-ray directivity and three-dimensional morphology, where spectral and imaging differences observed from multiple perspectives provide critical constraints. We present the preliminary results of the spectral calibrations of ASO-S/HXI through internal consistency checks of its three total flux detectors and cross-calibrations with Solar Orbiter/STIX, Fermi/GBM, and Konus-Wind data. Both calibration tests suggest that the response matrix of one of the HXI total flux monitors, D94 (with a thin aluminum window), needs to be modified. The new response matrix is determined by testing the series of response matrices with changing effective aluminum thickness through simulations. Post-correction analysis reveals ∼ 88 % $\sim 88\%$ of co-observed events demonstrate electron spectral index consistency within ± 0.5 $\pm 0.5$ , while comparisons of the total counts above 30 keV show < 10% differences for STIX-HXI flares with separation angles < 20° and Fermi-observed moderate flares. Though challenges persist regarding detector response uncertainties, the pile-up effect, and other nonideal factors, the achieved inter-instrument consistency enables quantitative electron anisotropy investigations through joint spectral analysis.