Abstract
The Astronomical Institute of the Slovak Academy of Sciences has published the intensities, recalibrated with respect to a common intensity scale, of the 530.3 nm (Fe xiv) green coronal line observed at ground-based stations up to the year 2008. The name of this publication is Homogeneous Data Set (HDS). We have developed a method that allows one to successfully substitute the ground-based observations by satellite observations and, thus, continue with the publication of the HDS. For this purpose, the observations of the Extreme-ultraviolet Imaging Telescope (EIT), onboard the Solar and Heliospheric Observatory (SOHO) satellite, were exploited. Among other data the EIT instrument provides almost daily 28.4 nm (Fe xv) emission-line snapshots of the corona. The Fe xiv and Fe xv data (4051 observation days) taken in the period 1996 – 2008 have been compared and good agreement was found. The method to obtain the individual data for the HDS follows from the correlation analysis described in this article. The resulting data, now under the name of Modified Homogeneous Data Set (MHDS), are identical up to 1996 to those in the HDS. The MHDS can be used further for studies of the coronal solar activity and its cycle. These data are available at http://www.suh.sk .
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Acknowledgements
We have used the EIT data, obtained onboard SOHO, and we are grateful to all the members of the SOHO/EIT Consortium who contributed to the observation and data reduction. SOHO is a project of international cooperation between ESA and NASA.
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Dorotovič, I., Minarovjech, M., Lorenc, M. et al. Modified Homogeneous Data Set of Coronal Intensities. Sol Phys 289, 2697–2703 (2014). https://doi.org/10.1007/s11207-014-0501-2
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DOI: https://doi.org/10.1007/s11207-014-0501-2