Hinode EIS: Updated In-flight Radiometric Calibration
We present an update to the in-flight radiometric calibration of the Hinode Extreme Ultraviolet Imaging Spectrometer (EIS), revising and extending our previous studies. We analyze full-spectral EIS observations of quiet Sun (QS) and active regions (ARs) from 2007 until 2022. Using CHIANTI version 10...
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IOP Publishing
2025-01-01
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| Series: | The Astrophysical Journal Supplement Series |
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| Online Access: | https://doi.org/10.3847/1538-4365/ad981f |
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| author | G. Del Zanna M. J. Weberg H. P. Warren |
| author_facet | G. Del Zanna M. J. Weberg H. P. Warren |
| author_sort | G. Del Zanna |
| collection | DOAJ |
| description | We present an update to the in-flight radiometric calibration of the Hinode Extreme Ultraviolet Imaging Spectrometer (EIS), revising and extending our previous studies. We analyze full-spectral EIS observations of quiet Sun (QS) and active regions (ARs) from 2007 until 2022. Using CHIANTI version 10, we adjust the EIS relative effective areas for a selection of dates with emission measure analyses of off-limb QS. We find generally good agreement (within typically ±15%) between measured and expected line intensities. We then consider selected intensity ratios for all of the dates and apply an automatic fitting method to adjust the relative effective areas. To constrain the absolute values from 2010 and later, we force agreement between EIS and Solar Dynamics Observatory Atmospheric Imaging Assembly 193 Å observations. The resulting calibration, with an uncertainty of about ±20%, is then validated in various ways, including flare line ratios from Fe xxiv and Fe xvii , emission measure analyses of cool AR loops, and several density-dependent line ratios. |
| format | Article |
| id | doaj-art-10988a5af96d4a1282bfea483aaf0f31 |
| institution | Kabale University |
| issn | 0067-0049 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | The Astrophysical Journal Supplement Series |
| spelling | doaj-art-10988a5af96d4a1282bfea483aaf0f312025-01-15T09:44:35ZengIOP PublishingThe Astrophysical Journal Supplement Series0067-00492025-01-0127624210.3847/1538-4365/ad981fHinode EIS: Updated In-flight Radiometric CalibrationG. Del Zanna0https://orcid.org/0000-0002-4125-0204M. J. Weberg1https://orcid.org/0000-0002-4433-4841H. P. Warren2https://orcid.org/0000-0001-6102-6851DAMTP, Center for Mathematical Sciences, University of Cambridge , Wilberforce Road, Cambridge, CB3 0WA, UK ; gd232@cam.ac.uk; School of Physics and Astronomy, University of Leicester , Leicester LE1 7RH, UKSpace Science Division , Naval Research Laboratory, Washington, DC 20375, USASpace Science Division , Naval Research Laboratory, Washington, DC 20375, USAWe present an update to the in-flight radiometric calibration of the Hinode Extreme Ultraviolet Imaging Spectrometer (EIS), revising and extending our previous studies. We analyze full-spectral EIS observations of quiet Sun (QS) and active regions (ARs) from 2007 until 2022. Using CHIANTI version 10, we adjust the EIS relative effective areas for a selection of dates with emission measure analyses of off-limb QS. We find generally good agreement (within typically ±15%) between measured and expected line intensities. We then consider selected intensity ratios for all of the dates and apply an automatic fitting method to adjust the relative effective areas. To constrain the absolute values from 2010 and later, we force agreement between EIS and Solar Dynamics Observatory Atmospheric Imaging Assembly 193 Å observations. The resulting calibration, with an uncertainty of about ±20%, is then validated in various ways, including flare line ratios from Fe xxiv and Fe xvii , emission measure analyses of cool AR loops, and several density-dependent line ratios.https://doi.org/10.3847/1538-4365/ad981fThe SunSolar extreme ultraviolet emissionCalibration |
| spellingShingle | G. Del Zanna M. J. Weberg H. P. Warren Hinode EIS: Updated In-flight Radiometric Calibration The Astrophysical Journal Supplement Series The Sun Solar extreme ultraviolet emission Calibration |
| title | Hinode EIS: Updated In-flight Radiometric Calibration |
| title_full | Hinode EIS: Updated In-flight Radiometric Calibration |
| title_fullStr | Hinode EIS: Updated In-flight Radiometric Calibration |
| title_full_unstemmed | Hinode EIS: Updated In-flight Radiometric Calibration |
| title_short | Hinode EIS: Updated In-flight Radiometric Calibration |
| title_sort | hinode eis updated in flight radiometric calibration |
| topic | The Sun Solar extreme ultraviolet emission Calibration |
| url | https://doi.org/10.3847/1538-4365/ad981f |
| work_keys_str_mv | AT gdelzanna hinodeeisupdatedinflightradiometriccalibration AT mjweberg hinodeeisupdatedinflightradiometriccalibration AT hpwarren hinodeeisupdatedinflightradiometriccalibration |