Investigating the Effect of Solar Ambient and Data Characteristics on Ca ii K Observations and Line Profile Measurements
We analyzed state-of-the-art observations of the solar atmosphere to investigate the dependence of the Ca ii K brightness of several solar features on spectral bandwidth and spatial resolution of the data. In particular, we study data obtained at the Swedish Solar Telescope with the Crisp Imaging Sp...
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| Format: | Article |
| Language: | English |
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IOP Publishing
2023-01-01
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| Series: | The Astrophysical Journal |
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| Online Access: | https://doi.org/10.3847/1538-4357/acc529 |
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| author | M. Murabito I. Ermolli T. Chatzistergos S. Jafarzadeh F. Giorgi L. Rouppe van der Voort |
| author_facet | M. Murabito I. Ermolli T. Chatzistergos S. Jafarzadeh F. Giorgi L. Rouppe van der Voort |
| author_sort | M. Murabito |
| collection | DOAJ |
| description | We analyzed state-of-the-art observations of the solar atmosphere to investigate the dependence of the Ca ii K brightness of several solar features on spectral bandwidth and spatial resolution of the data. In particular, we study data obtained at the Swedish Solar Telescope with the Crisp Imaging Spectropolarimeter and Chromospheric Imaging Spectrometer instruments. The analyzed data, which are characterized by a spectral bandwidth of 0.12 Å and a spatial resolution of 0.″078, were acquired close to the disk center by targeting a quiet-Sun area and an active region. We convolved the original observations with Gaussian kernels to degrade their spectral bandwidth and spatial resolution to the instrumental characteristics of the most prominent series of Ca ii K observations available to date. We then studied the effect of data degradation on the observed regions and on parameters derived from Ca ii K line measurements that are largely employed as diagnostics of the solar and stellar chromospheres. We find that the effect of degrading the spectral resolution of Ca ii K observations and line profiles depends on both the employed bandwidth and observed solar region. Besides, we found that the spatial degradation impacts the data characterized by a broad bandwidth to a larger extent compared to those acquired with a narrow band. However, the appearance of the observed solar regions is only slightly affected by the spatial resolution of data with bandwidths up to 1 Å and in the range [3,10] Å. Finally, we derived relationships that can be used to intercalibrate results from observations taken with different instruments in diverse regions of the solar atmosphere. |
| first_indexed | 2024-03-12T04:36:17Z |
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| institution | Directory Open Access Journal |
| issn | 1538-4357 |
| language | English |
| last_indexed | 2024-03-12T04:36:17Z |
| publishDate | 2023-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | The Astrophysical Journal |
| spelling | doaj.art-a94d3f6db4254d4792939f03f24f2fe02023-09-03T09:56:16ZengIOP PublishingThe Astrophysical Journal1538-43572023-01-0194711810.3847/1538-4357/acc529Investigating the Effect of Solar Ambient and Data Characteristics on Ca ii K Observations and Line Profile MeasurementsM. Murabito0https://orcid.org/0000-0002-0144-2252I. Ermolli1https://orcid.org/0000-0003-2596-9523T. Chatzistergos2https://orcid.org/0000-0002-0335-9831S. Jafarzadeh3https://orcid.org/0000-0002-7711-5397F. Giorgi4https://orcid.org/0000-0002-0974-2401L. Rouppe van der Voort5https://orcid.org/0000-0003-2088-028XINAF Osservatorio Astronomico di Capodimonte , Salita Moiariello 16, I-80131 Naples, Italy ; mariarita.murabito@inaf.itINAF Osservatorio Astronomico di Roma , Via Frascati 33, I-00078 Monte Porzio Catone, ItalyMax Planck Institute for Solar System Research , Justus-von-Liebig-Weg 3, D-37077 Göttingen, GermanyMax Planck Institute for Solar System Research , Justus-von-Liebig-Weg 3, D-37077 Göttingen, Germany; Rosseland Centre for Solar Physics, University of Oslo , P.O. Box 1029, Blindern, NO-0315 Oslo, NorwayINAF Osservatorio Astronomico di Roma , Via Frascati 33, I-00078 Monte Porzio Catone, ItalyRosseland Centre for Solar Physics, University of Oslo , P.O. Box 1029, Blindern, NO-0315 Oslo, Norway; Institute of Theoretical Astrophysics, University of Oslo , P.O. Box 1029, Blindern, NO-0315 Oslo, NorwayWe analyzed state-of-the-art observations of the solar atmosphere to investigate the dependence of the Ca ii K brightness of several solar features on spectral bandwidth and spatial resolution of the data. In particular, we study data obtained at the Swedish Solar Telescope with the Crisp Imaging Spectropolarimeter and Chromospheric Imaging Spectrometer instruments. The analyzed data, which are characterized by a spectral bandwidth of 0.12 Å and a spatial resolution of 0.″078, were acquired close to the disk center by targeting a quiet-Sun area and an active region. We convolved the original observations with Gaussian kernels to degrade their spectral bandwidth and spatial resolution to the instrumental characteristics of the most prominent series of Ca ii K observations available to date. We then studied the effect of data degradation on the observed regions and on parameters derived from Ca ii K line measurements that are largely employed as diagnostics of the solar and stellar chromospheres. We find that the effect of degrading the spectral resolution of Ca ii K observations and line profiles depends on both the employed bandwidth and observed solar region. Besides, we found that the spatial degradation impacts the data characterized by a broad bandwidth to a larger extent compared to those acquired with a narrow band. However, the appearance of the observed solar regions is only slightly affected by the spatial resolution of data with bandwidths up to 1 Å and in the range [3,10] Å. Finally, we derived relationships that can be used to intercalibrate results from observations taken with different instruments in diverse regions of the solar atmosphere.https://doi.org/10.3847/1538-4357/acc529Solar chromospherePlagesSolar photosphereSunspotsSolar activity |
| spellingShingle | M. Murabito I. Ermolli T. Chatzistergos S. Jafarzadeh F. Giorgi L. Rouppe van der Voort Investigating the Effect of Solar Ambient and Data Characteristics on Ca ii K Observations and Line Profile Measurements The Astrophysical Journal Solar chromosphere Plages Solar photosphere Sunspots Solar activity |
| title | Investigating the Effect of Solar Ambient and Data Characteristics on Ca ii K Observations and Line Profile Measurements |
| title_full | Investigating the Effect of Solar Ambient and Data Characteristics on Ca ii K Observations and Line Profile Measurements |
| title_fullStr | Investigating the Effect of Solar Ambient and Data Characteristics on Ca ii K Observations and Line Profile Measurements |
| title_full_unstemmed | Investigating the Effect of Solar Ambient and Data Characteristics on Ca ii K Observations and Line Profile Measurements |
| title_short | Investigating the Effect of Solar Ambient and Data Characteristics on Ca ii K Observations and Line Profile Measurements |
| title_sort | investigating the effect of solar ambient and data characteristics on ca ii k observations and line profile measurements |
| topic | Solar chromosphere Plages Solar photosphere Sunspots Solar activity |
| url | https://doi.org/10.3847/1538-4357/acc529 |
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