An Elemental Abundance Diagnostic for Coordinated Solar Orbiter/SPICE and Hinode/EIS Observations
Plasma composition measurements are a vital tool for the success of current and future solar missions, but density- and temperature-insensitive spectroscopic diagnostic ratios are sparse, and their underlying accuracy in determining the magnitude of the first ionization potential (FIP) effect in the...
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IOP Publishing
2024-01-01
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| Online Access: | https://doi.org/10.3847/1538-4357/ad87ef |
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| author | David H. Brooks Harry P. Warren Deborah Baker Sarah A. Matthews Stephanie L. Yardley |
| author_facet | David H. Brooks Harry P. Warren Deborah Baker Sarah A. Matthews Stephanie L. Yardley |
| author_sort | David H. Brooks |
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| description | Plasma composition measurements are a vital tool for the success of current and future solar missions, but density- and temperature-insensitive spectroscopic diagnostic ratios are sparse, and their underlying accuracy in determining the magnitude of the first ionization potential (FIP) effect in the solar atmosphere remains an open question. Here we assess the Fe viii 185.213 Å/Ne viii 770.428 Å intensity ratio that can be observed as a multispacecraft combination between Solar Orbiter/SPICE and Hinode/EUV Imaging Spectrometer (EIS). We find that it is fairly insensitive to temperature and density in the range of log ( T /K) = 5.65–6.05 and is therefore useful, in principle, for analyzing on-orbit EUV spectra. We also perform an empirical experiment, using Hinode/EIS measurements of coronal fan loop temperature distributions weighted by randomly generated FIP bias values, to show that our diagnostic method can provide accurate results as it recovers the input FIP bias to within 10%–14%. This is encouraging since it is smaller than the magnitude of variations seen throughout the solar corona. We apply the diagnostic to coordinated observations from 2023 March and show that the combination of SPICE and EIS allows measurements of the Fe/Ne FIP bias in the regions where the footpoints of the magnetic field connected to Solar Orbiter are predicted to be located. The results show an increase in FIP bias between the main leading polarity and the trailing decayed polarity that broadly agrees with Fe/O in situ measurements from Solar Orbiter/Solar Wind Analyser. Multispacecraft coordinated observations are complex, but this diagnostic also falls within the planned wavebands for Solar-C/Extreme UltraViolet high-throughput Spectroscopic Telescope. |
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| institution | Kabale University |
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| publishDate | 2024-01-01 |
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| series | The Astrophysical Journal |
| spelling | doaj-art-fc81bd8936734c1cbe3bbe8b3b35d1bf2024-11-22T07:01:14ZengIOP PublishingThe Astrophysical Journal1538-43572024-01-01976218810.3847/1538-4357/ad87efAn Elemental Abundance Diagnostic for Coordinated Solar Orbiter/SPICE and Hinode/EIS ObservationsDavid H. Brooks0https://orcid.org/0000-0002-2189-9313Harry P. Warren1https://orcid.org/0000-0001-6102-6851Deborah Baker2https://orcid.org/0000-0002-0665-2355Sarah A. Matthews3https://orcid.org/0000-0001-9346-8179Stephanie L. Yardley4https://orcid.org/0000-0003-2802-4381Department of Physics & Astronomy, George Mason University , 4400 University Drive, Fairfax, VA 22030, USA; University College London , Mullard Space Science Laboratory, Holmbury St. Mary, Dorking, Surrey, RH5 6NT, UKSpace Science Division , Naval Research Laboratory, Washington, DC 20375, USAUniversity College London , Mullard Space Science Laboratory, Holmbury St. Mary, Dorking, Surrey, RH5 6NT, UKUniversity College London , Mullard Space Science Laboratory, Holmbury St. Mary, Dorking, Surrey, RH5 6NT, UKUniversity College London , Mullard Space Science Laboratory, Holmbury St. Mary, Dorking, Surrey, RH5 6NT, UK; Department of Mathematics, Physics & Electrical Engineering, Northumbria University , Ellison Place, Newcastle upon Tyne, NE1 8ST, UK; Donostia International Physics Center , Paseo Manuel de Lardizabal 4, San Sebastián, 20018, SpainPlasma composition measurements are a vital tool for the success of current and future solar missions, but density- and temperature-insensitive spectroscopic diagnostic ratios are sparse, and their underlying accuracy in determining the magnitude of the first ionization potential (FIP) effect in the solar atmosphere remains an open question. Here we assess the Fe viii 185.213 Å/Ne viii 770.428 Å intensity ratio that can be observed as a multispacecraft combination between Solar Orbiter/SPICE and Hinode/EUV Imaging Spectrometer (EIS). We find that it is fairly insensitive to temperature and density in the range of log ( T /K) = 5.65–6.05 and is therefore useful, in principle, for analyzing on-orbit EUV spectra. We also perform an empirical experiment, using Hinode/EIS measurements of coronal fan loop temperature distributions weighted by randomly generated FIP bias values, to show that our diagnostic method can provide accurate results as it recovers the input FIP bias to within 10%–14%. This is encouraging since it is smaller than the magnitude of variations seen throughout the solar corona. We apply the diagnostic to coordinated observations from 2023 March and show that the combination of SPICE and EIS allows measurements of the Fe/Ne FIP bias in the regions where the footpoints of the magnetic field connected to Solar Orbiter are predicted to be located. The results show an increase in FIP bias between the main leading polarity and the trailing decayed polarity that broadly agrees with Fe/O in situ measurements from Solar Orbiter/Solar Wind Analyser. Multispacecraft coordinated observations are complex, but this diagnostic also falls within the planned wavebands for Solar-C/Extreme UltraViolet high-throughput Spectroscopic Telescope.https://doi.org/10.3847/1538-4357/ad87efSolar physicsSolar coronaSolar coronal loopsSlow solar windSolar extreme ultraviolet emissionAtomic spectroscopy |
| spellingShingle | David H. Brooks Harry P. Warren Deborah Baker Sarah A. Matthews Stephanie L. Yardley An Elemental Abundance Diagnostic for Coordinated Solar Orbiter/SPICE and Hinode/EIS Observations The Astrophysical Journal Solar physics Solar corona Solar coronal loops Slow solar wind Solar extreme ultraviolet emission Atomic spectroscopy |
| title | An Elemental Abundance Diagnostic for Coordinated Solar Orbiter/SPICE and Hinode/EIS Observations |
| title_full | An Elemental Abundance Diagnostic for Coordinated Solar Orbiter/SPICE and Hinode/EIS Observations |
| title_fullStr | An Elemental Abundance Diagnostic for Coordinated Solar Orbiter/SPICE and Hinode/EIS Observations |
| title_full_unstemmed | An Elemental Abundance Diagnostic for Coordinated Solar Orbiter/SPICE and Hinode/EIS Observations |
| title_short | An Elemental Abundance Diagnostic for Coordinated Solar Orbiter/SPICE and Hinode/EIS Observations |
| title_sort | elemental abundance diagnostic for coordinated solar orbiter spice and hinode eis observations |
| topic | Solar physics Solar corona Solar coronal loops Slow solar wind Solar extreme ultraviolet emission Atomic spectroscopy |
| url | https://doi.org/10.3847/1538-4357/ad87ef |
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