{"id":{"repo_id":"freiburg-diss","oai_identifier":"oai:freidok.uni-freiburg.de:712"},"canonical_url":"https://search.dev.ndltd.org/etd/freiburg-diss/oai:freidok.uni-freiburg.de:712","repository":{"repo_id":"freiburg-diss","name":"University of Freiburg","base_url":"https://freidok.uni-freiburg.de/oai/oai2.php"},"display":{"title":"Spectroscopy of small scale magnetic structures in the solar photosphere","abstract":"If the sun is imaged in the G-band (a spectral range at 430nm that
is dominated by electronic transitions of the CH-molecule) at a
sufficiently high resolution, the presence of the so-called G-band
bright points is revealed.
They are interpreted as small-scale magnetic field
concentrations that are embedded in the convective flow field of the
solar photosphere.
As manifestations of small scale magnetic fields, bright points become
important for the understanding of the coronal heating process and the
variability of the solar irradiance.
Hitherto all observations of this fine structure in the G-band
have been obtained with broadband interference filters that integrate
the spectral intensity over a variety of absorption lines.
In this thesis the physical structure of the G-band bright points and
the properties of the G-band itself are investigated.
The required spectral data at high spatial resolution is in part obtained
with the help of a low order adaptive optic system.
A comparison with synthesized spectra of different model atmospheres
is done as well.","abstract_html":"If the sun is imaged in the G-band (a spectral range at 430nm that <br>is dominated by electronic transitions of the CH-molecule) at a <br>sufficiently high resolution, the presence of the so-called G-band <br>bright points is revealed. <br>They are interpreted as small-scale magnetic field <br>concentrations that are embedded in the convective flow field of the <br>solar photosphere. <br>As manifestations of small scale magnetic fields, bright points become <br>important for the understanding of the coronal heating process and the <br>variability of the solar irradiance. <br>Hitherto all observations of this fine structure in the G-band <br>have been obtained with broadband interference filters that integrate <br>the spectral intensity over a variety of absorption lines. <br>In this thesis the physical structure of the G-band bright points and <br>the properties of the G-band itself are investigated. <br>The required spectral data at high spatial resolution is in part obtained <br>with the help of a low order adaptive optic system. <br>A comparison with synthesized spectra of different model atmospheres <br>is done as well.","abstract_has_math":false,"creators":["Langhans, Kai Christian Gerd"],"institution":null,"degree_name":null,"degree_level":null,"degree_discipline":null,"degree_department":null,"school":null,"contributors":["Schmidt, Wolfgang"],"advisors":[],"committee_chairs":[],"committee_members":[],"year":null,"date_issued":"","date_published":null,"updated_at":"2026-07-24T02:21:52Z","subjects":["sun","solar photosphere","magnetic field","spectroscopy"],"languages":[],"rights":[],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"https://freidok.uni-freiburg.de/data/712","outbound_label":"Repository record","outbound_source":"source_url"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Schmidt, Wolfgang"]},{"key":"dc:creator","label":"Author","values":["Langhans, Kai Christian Gerd"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:type","label":"Dc Type","values":["DoctoralThesis"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["sun","solar photosphere","magnetic field","spectroscopy"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description.abstract","label":"Abstract","values":["If the sun is imaged in the G-band (a spectral range at 430nm that
is dominated by electronic transitions of the CH-molecule) at a
sufficiently high resolution, the presence of the so-called G-band
bright points is revealed.
They are interpreted as small-scale magnetic field
concentrations that are embedded in the convective flow field of the
solar photosphere.
As manifestations of small scale magnetic fields, bright points become
important for the understanding of the coronal heating process and the
variability of the solar irradiance.
Hitherto all observations of this fine structure in the G-band
have been obtained with broadband interference filters that integrate
the spectral intensity over a variety of absorption lines.
In this thesis the physical structure of the G-band bright points and
the properties of the G-band itself are investigated.
The required spectral data at high spatial resolution is in part obtained
with the help of a low order adaptive optic system.
A comparison with synthesized spectra of different model atmospheres
is done as well."]},{"key":"dc:format.medium","label":"Dc Format Medium","values":["application/pdf"]},{"key":"dc:title","label":"Title","values":["Spectroscopy of small scale magnetic structures in the solar photosphere","Spektroskopie kleinräumiger Magnetfeldstrukturen in der Sonnenatmosphäre"]}]}],"canonical_facts":{"dc:contributor":["Schmidt, Wolfgang"],"dc:creator":["Langhans, Kai Christian Gerd"],"dc:description.abstract":["If the sun is imaged in the G-band (a spectral range at 430nm that
is dominated by electronic transitions of the CH-molecule) at a
sufficiently high resolution, the presence of the so-called G-band
bright points is revealed.
They are interpreted as small-scale magnetic field
concentrations that are embedded in the convective flow field of the
solar photosphere.
As manifestations of small scale magnetic fields, bright points become
important for the understanding of the coronal heating process and the
variability of the solar irradiance.
Hitherto all observations of this fine structure in the G-band
have been obtained with broadband interference filters that integrate
the spectral intensity over a variety of absorption lines.
In this thesis the physical structure of the G-band bright points and
the properties of the G-band itself are investigated.
The required spectral data at high spatial resolution is in part obtained
with the help of a low order adaptive optic system.
A comparison with synthesized spectra of different model atmospheres
is done as well."],"dc:format.medium":["application/pdf"],"dc:subject":["sun","solar photosphere","magnetic field","spectroscopy"],"dc:title":["Spectroscopy of small scale magnetic structures in the solar photosphere","Spektroskopie kleinräumiger Magnetfeldstrukturen in der Sonnenatmosphäre"],"dc:type":["DoctoralThesis"]},"updated_at":"2026-07-24T02:21:52Z"}