Poster Open Access

Modelling Solar Ca II H&K Emission Variations

Sowmya, Krishnamurthy; Shapiro, Alexander I.; Witzke, Veronika; Nèmec, Nina-E.; Chatzistergos, Theodosis; Yeo, Kok Leng; Krivova, Natalie A.; Solanki, Sami K.


DCAT Export

<?xml version='1.0' encoding='utf-8'?>
<rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" xmlns:adms="http://www.w3.org/ns/adms#" xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:dct="http://purl.org/dc/terms/" xmlns:dctype="http://purl.org/dc/dcmitype/" xmlns:dcat="http://www.w3.org/ns/dcat#" xmlns:duv="http://www.w3.org/ns/duv#" xmlns:foaf="http://xmlns.com/foaf/0.1/" xmlns:frapo="http://purl.org/cerif/frapo/" xmlns:geo="http://www.w3.org/2003/01/geo/wgs84_pos#" xmlns:gsp="http://www.opengis.net/ont/geosparql#" xmlns:locn="http://www.w3.org/ns/locn#" xmlns:org="http://www.w3.org/ns/org#" xmlns:owl="http://www.w3.org/2002/07/owl#" xmlns:prov="http://www.w3.org/ns/prov#" xmlns:rdfs="http://www.w3.org/2000/01/rdf-schema#" xmlns:schema="http://schema.org/" xmlns:skos="http://www.w3.org/2004/02/skos/core#" xmlns:vcard="http://www.w3.org/2006/vcard/ns#" xmlns:wdrs="http://www.w3.org/2007/05/powder-s#">
  <rdf:Description rdf:about="https://doi.org/10.5281/zenodo.4564796">
    <rdf:type rdf:resource="http://www.w3.org/ns/dcat#Dataset"/>
    <dct:type rdf:resource="http://purl.org/dc/dcmitype/Text"/>
    <dct:identifier rdf:datatype="http://www.w3.org/2001/XMLSchema#anyURI">https://doi.org/10.5281/zenodo.4564796</dct:identifier>
    <foaf:page rdf:resource="https://doi.org/10.5281/zenodo.4564796"/>
    <dct:creator>
      <rdf:Description rdf:about="http://orcid.org/0000-0002-3243-1230">
        <rdf:type rdf:resource="http://xmlns.com/foaf/0.1/Agent"/>
        <dct:identifier rdf:datatype="http://www.w3.org/2001/XMLSchema#string">0000-0002-3243-1230</dct:identifier>
        <foaf:name>Sowmya, Krishnamurthy</foaf:name>
        <foaf:givenName>Krishnamurthy</foaf:givenName>
        <foaf:familyName>Sowmya</foaf:familyName>
        <org:memberOf>
          <foaf:Organization>
            <foaf:name>Max Planck Institute for Solar System Research</foaf:name>
          </foaf:Organization>
        </org:memberOf>
      </rdf:Description>
    </dct:creator>
    <dct:creator>
      <rdf:Description rdf:about="http://orcid.org/0000-0002-8842-5403">
        <rdf:type rdf:resource="http://xmlns.com/foaf/0.1/Agent"/>
        <dct:identifier rdf:datatype="http://www.w3.org/2001/XMLSchema#string">0000-0002-8842-5403</dct:identifier>
        <foaf:name>Shapiro, Alexander I.</foaf:name>
        <foaf:givenName>Alexander I.</foaf:givenName>
        <foaf:familyName>Shapiro</foaf:familyName>
        <org:memberOf>
          <foaf:Organization>
            <foaf:name>Max Planck Institute for Solar System Research</foaf:name>
          </foaf:Organization>
        </org:memberOf>
      </rdf:Description>
    </dct:creator>
    <dct:creator>
      <rdf:Description rdf:about="http://orcid.org/0000-0002-0929-1612">
        <rdf:type rdf:resource="http://xmlns.com/foaf/0.1/Agent"/>
        <dct:identifier rdf:datatype="http://www.w3.org/2001/XMLSchema#string">0000-0002-0929-1612</dct:identifier>
        <foaf:name>Witzke, Veronika</foaf:name>
        <foaf:givenName>Veronika</foaf:givenName>
        <foaf:familyName>Witzke</foaf:familyName>
        <org:memberOf>
          <foaf:Organization>
            <foaf:name>Max Planck Institute for Solar System Research</foaf:name>
          </foaf:Organization>
        </org:memberOf>
      </rdf:Description>
    </dct:creator>
    <dct:creator>
      <rdf:Description rdf:about="http://orcid.org/0000-0001-6090-1247">
        <rdf:type rdf:resource="http://xmlns.com/foaf/0.1/Agent"/>
        <dct:identifier rdf:datatype="http://www.w3.org/2001/XMLSchema#string">0000-0001-6090-1247</dct:identifier>
        <foaf:name>Nèmec, Nina-E.</foaf:name>
        <foaf:givenName>Nina-E.</foaf:givenName>
        <foaf:familyName>Nèmec</foaf:familyName>
        <org:memberOf>
          <foaf:Organization>
            <foaf:name>Max Planck Institute for Solar System Research</foaf:name>
          </foaf:Organization>
        </org:memberOf>
      </rdf:Description>
    </dct:creator>
    <dct:creator>
      <rdf:Description rdf:about="http://orcid.org/0000-0002-0335-9831">
        <rdf:type rdf:resource="http://xmlns.com/foaf/0.1/Agent"/>
        <dct:identifier rdf:datatype="http://www.w3.org/2001/XMLSchema#string">0000-0002-0335-9831</dct:identifier>
        <foaf:name>Chatzistergos, Theodosis</foaf:name>
        <foaf:givenName>Theodosis</foaf:givenName>
        <foaf:familyName>Chatzistergos</foaf:familyName>
        <org:memberOf>
          <foaf:Organization>
            <foaf:name>Max Planck Institute for Solar System Research</foaf:name>
          </foaf:Organization>
        </org:memberOf>
      </rdf:Description>
    </dct:creator>
    <dct:creator>
      <rdf:Description rdf:about="http://orcid.org/0000-0003-3851-7323">
        <rdf:type rdf:resource="http://xmlns.com/foaf/0.1/Agent"/>
        <dct:identifier rdf:datatype="http://www.w3.org/2001/XMLSchema#string">0000-0003-3851-7323</dct:identifier>
        <foaf:name>Yeo, Kok Leng</foaf:name>
        <foaf:givenName>Kok Leng</foaf:givenName>
        <foaf:familyName>Yeo</foaf:familyName>
        <org:memberOf>
          <foaf:Organization>
            <foaf:name>Max Planck Institute for Solar System Research</foaf:name>
          </foaf:Organization>
        </org:memberOf>
      </rdf:Description>
    </dct:creator>
    <dct:creator>
      <rdf:Description rdf:about="http://orcid.org/0000-0002-1377-3067">
        <rdf:type rdf:resource="http://xmlns.com/foaf/0.1/Agent"/>
        <dct:identifier rdf:datatype="http://www.w3.org/2001/XMLSchema#string">0000-0002-1377-3067</dct:identifier>
        <foaf:name>Krivova, Natalie A.</foaf:name>
        <foaf:givenName>Natalie A.</foaf:givenName>
        <foaf:familyName>Krivova</foaf:familyName>
        <org:memberOf>
          <foaf:Organization>
            <foaf:name>Max Planck Institute for Solar System Research</foaf:name>
          </foaf:Organization>
        </org:memberOf>
      </rdf:Description>
    </dct:creator>
    <dct:creator>
      <rdf:Description rdf:about="http://orcid.org/0000-0002-3418-8449">
        <rdf:type rdf:resource="http://xmlns.com/foaf/0.1/Agent"/>
        <dct:identifier rdf:datatype="http://www.w3.org/2001/XMLSchema#string">0000-0002-3418-8449</dct:identifier>
        <foaf:name>Solanki, Sami K.</foaf:name>
        <foaf:givenName>Sami K.</foaf:givenName>
        <foaf:familyName>Solanki</foaf:familyName>
        <org:memberOf>
          <foaf:Organization>
            <foaf:name>Max Planck Institute for Solar System Research</foaf:name>
          </foaf:Organization>
        </org:memberOf>
      </rdf:Description>
    </dct:creator>
    <dct:title>Modelling Solar Ca II H&amp;K Emission Variations</dct:title>
    <dct:publisher>
      <foaf:Agent>
        <foaf:name>Zenodo</foaf:name>
      </foaf:Agent>
    </dct:publisher>
    <dct:issued rdf:datatype="http://www.w3.org/2001/XMLSchema#gYear">2021</dct:issued>
    <dcat:keyword>The Sun and the Heliosphere</dcat:keyword>
    <dcat:keyword>Solar activity</dcat:keyword>
    <dcat:keyword>Solar chromosphere</dcat:keyword>
    <dcat:keyword>Stellar activity</dcat:keyword>
    <frapo:isFundedBy rdf:resource="info:eu-repo/grantAgreement/EC/H2020/797715/"/>
    <schema:funder>
      <foaf:Organization>
        <dct:identifier rdf:datatype="http://www.w3.org/2001/XMLSchema#string">10.13039/501100000780</dct:identifier>
        <foaf:name>European Commission</foaf:name>
      </foaf:Organization>
    </schema:funder>
    <schema:editor>
      <rdf:Description>
        <rdf:type rdf:resource="http://xmlns.com/foaf/0.1/Agent"/>
        <foaf:name>Wolk, Scott</foaf:name>
        <foaf:givenName>Scott</foaf:givenName>
        <foaf:familyName>Wolk</foaf:familyName>
      </rdf:Description>
    </schema:editor>
    <dct:issued rdf:datatype="http://www.w3.org/2001/XMLSchema#date">2021-02-26</dct:issued>
    <dct:language rdf:resource="http://publications.europa.eu/resource/authority/language/ENG"/>
    <owl:sameAs rdf:resource="https://zenodo.org/record/4564796"/>
    <adms:identifier>
      <adms:Identifier>
        <skos:notation rdf:datatype="http://www.w3.org/2001/XMLSchema#anyURI">https://zenodo.org/record/4564796</skos:notation>
        <adms:schemeAgency>url</adms:schemeAgency>
      </adms:Identifier>
    </adms:identifier>
    <dct:isVersionOf rdf:resource="https://doi.org/10.5281/zenodo.4564795"/>
    <dct:isPartOf rdf:resource="https://zenodo.org/communities/coolstars20half"/>
    <dct:description>&lt;p&gt;The emission in the near ultraviolet Ca II H&amp;amp;K lines, often quantified via the S-index, has been serving as a prime proxy of solar and stellar magnetic activity. Despite the broad usage of the S-index, the link between the coverage of a stellar disk by magnetic features and Ca II&amp;nbsp;H&amp;amp;K emission is not fully understood. In order to fill this gap we developed a physics-based model to calculate the solar S-index. To this end, we made use of the distributions of the solar magnetic features derived from the simulations of magnetic flux emergence and surface transport, together with the Ca II&amp;nbsp;H&amp;amp;K spectra synthesized using a non-local thermodynamic equilibrium (non-LTE) radiative transfer code.&lt;/p&gt; &lt;p&gt;We show that the value of the solar S-index is influenced by the inclination angle between the solar rotation axis and the observer&amp;rsquo;s line-of-sight, i.e. the solar S-index values obtained by an out-of-ecliptic observer are different from those obtained by an ecliptic-bound observer. This is important for comparing the magnetic activity of the Sun to other stars. We computed time series of the S-index as they would be observed at various inclinations dating back to 1700. We find that depending on the inclination and period of observations, the activity cycle in solar S-index can appear weaker or stronger than in stars with a solar-like level of magnetic activity. We show that there is nothing unusual about the solar chromospheric emission variations in the context of stars with near-solar magnetic activity.&lt;/p&gt;</dct:description>
    <dct:accessRights rdf:resource="http://publications.europa.eu/resource/authority/access-right/PUBLIC"/>
    <dct:accessRights>
      <dct:RightsStatement rdf:about="info:eu-repo/semantics/openAccess">
        <rdfs:label>Open Access</rdfs:label>
      </dct:RightsStatement>
    </dct:accessRights>
    <dcat:distribution>
      <dcat:Distribution>
        <dct:license rdf:resource="https://creativecommons.org/licenses/by/4.0/legalcode"/>
        <dcat:accessURL rdf:resource="https://doi.org/10.5281/zenodo.4564796"/>
      </dcat:Distribution>
    </dcat:distribution>
    <dcat:distribution>
      <dcat:Distribution>
        <dcat:accessURL rdf:resource="https://doi.org/10.5281/zenodo.4564796"/>
        <dcat:byteSize>1173177</dcat:byteSize>
        <dcat:downloadURL rdf:resource="https://zenodo.org/record/4564796/files/KrishnamurthyS.jpeg"/>
        <dcat:mediaType>image/jpeg</dcat:mediaType>
      </dcat:Distribution>
    </dcat:distribution>
    <dcat:distribution>
      <dcat:Distribution>
        <dcat:accessURL rdf:resource="https://doi.org/10.5281/zenodo.4564796"/>
        <dcat:byteSize>2529086</dcat:byteSize>
        <dcat:downloadURL rdf:resource="https://zenodo.org/record/4564796/files/KrishnamurthyS.pdf"/>
        <dcat:mediaType>application/pdf</dcat:mediaType>
      </dcat:Distribution>
    </dcat:distribution>
  </rdf:Description>
  <foaf:Project rdf:about="info:eu-repo/grantAgreement/EC/H2020/797715/">
    <dct:identifier rdf:datatype="http://www.w3.org/2001/XMLSchema#string">797715</dct:identifier>
    <dct:title>Impact of Magnetic field on Emergent solar spectra</dct:title>
    <frapo:isAwardedBy>
      <foaf:Organization>
        <dct:identifier rdf:datatype="http://www.w3.org/2001/XMLSchema#string">10.13039/501100000780</dct:identifier>
        <foaf:name>European Commission</foaf:name>
      </foaf:Organization>
    </frapo:isAwardedBy>
  </foaf:Project>
</rdf:RDF>
69
36
views
downloads
All versions This version
Views 6969
Downloads 3636
Data volume 85.6 MB85.6 MB
Unique views 6363
Unique downloads 3434

Share

Cite as