Comparison of Magnesium II core-to-wing ratio observations during solar minimum 23/24

The MgII index is an important proxy for solar activity; in particular it correlates well with the EUV which is important for understanding the upper atmosphere. We compare the measurements from all of the instruments making daily measurements during the most recent solar minimum. After adjustments...

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Bibliographic Details
Published in:Journal of space weather and space climate 2014, Vol.4, p.A04
Main Authors: Snow, Martin, Weber, Mark, Machol, Janet, Viereck, Rodney, Richard, Erik
Format: Article
Language:English
Subjects:
Atmosphere
Channels
Climate
Ionosphere
Irradiance
Magnesium
Redundant
Snow
Solar activity
Solar cycle
Solar minimum
Solstices
Space weather
Time series
Upper atmosphere
UV flux
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Summary:The MgII index is an important proxy for solar activity; in particular it correlates well with the EUV which is important for understanding the upper atmosphere. We compare the measurements from all of the instruments making daily measurements during the most recent solar minimum. After adjustments to the data to account for instrumental effects, we find that there are still some discrepancies between the various time series. The data from the primary channel of the SOLar-STellar Irradiance Comparison Experiment (SOLSTICE) on SORCE requires a correction factor starting in early 2006 in order to bring it into agreement with the redundant SOLSTICE channel and with the other datasets. Once this correction has been applied, all the MgII measurements are in good agreement throughout the solar minimum interval.
ISSN:2115-7251
2115-7251
DOI:10.1051/swsc/2014001