New Homogeneous Dataset of Solar EUV Synoptic Maps from SOHO/EIT and SDO/AIA
|Author:||Hamada, A.1; Asikainen, T.1; Mursula, K.1|
1ReSoLVE Centre of Excellence, Space Climate Research Unit, University of Oulu, Oulu, Finland
|Online Access:||PDF Full Text (PDF, 7.7 MB)|
|Persistent link:|| http://urn.fi/urn:nbn:fi-fe202003309645
|Publish Date:|| 2020-03-30
Synoptic maps of solar EUV intensities have been constructed for many decades in order to display the distribution of the different EUV emissions across the solar surface, with each map representing one Carrington rotation (i.e. one rotation of the Sun). This article presents a new solar EUV synoptic map dataset based on full-disk images from the Solar and Heliospheric Observatory/Extreme Ultraviolet Imaging Telescope (SOHO/EIT) and Solar Dynamics Observatory/Atmospheric Imaging Assembly (SDO/AIA). In order to remove the significant and complicated drift of EIT and AIA EUV intensities due to sensor degradation, we construct the synoptic maps in standardized intensity scale. We describe a method of homogenizing the SOHO/EIT maps with SDO/AIA maps by transforming the EIT intensity histograms to AIA levels. The new maps cover the years from 1996 to 2018 with 307 SOHO/EIT and 116 SDO/AIA synoptic maps, respectively. These maps provide a systematic and homogeneous view of the entire solar surface in four EUV wavelengths, and are well suited, e.g., for studying long-term coronal hole evolution.
|Type of Publication:||
A1 Journal article – refereed
|Field of Science:||
115 Astronomy and space science
Open access funding provided by University of Oulu including Oulu University Hospital. We acknowledge the financial support by the Academy of Finland to the ReSoLVE Center of Excellence (project No. 307411).
|Academy of Finland Grant Number:||
307411 (Academy of Finland Funding decision)
The dataset constructed here is available by request to the authors (A. Hamada, email@example.com; T. Asikainen, firstname.lastname@example.org, or K. Mursula, email@example.com).
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