ionospheric ionization calculated from combined solaces-sdo/eve solar euv … · 2015-09-16 ·...
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Institut für Meteorologie
IUGG 26th General Assembly, Prague, June 22 – July 2, 2015
Ionospheric ionization calculated from combined SolACES-SDO/EVE solar EUV spectra and comparison
with delayed global TEC
Christoph Jacobi, Claudia UnglaubUniversity of Leipzig, Institute for Meteorology, Leipzig, Germany
Gerhard Schmidtke, Robert Schäfer, Raimund BrunnerFraunhofer IPM, Freiburg, Germany
Thomas N. WoodsLaboratory for Atmospheric and Space Research, University of Colorado Boulder, USA
Norbert JakowskiGerman Aerospace Center, Neustrelitz, Germany
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Institut für MeteorologieOutline
• Combined EUV spectra from SDO/EVE and SolACES
• EUV proxy from primary ionization calculations
• Analysis of ionospheric delay
• Conclusions
IUGG 26th General Assembly, Prague, June 22 – July 2, 2015 2
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Institut für MeteorologieSDO/EVE and SolACES
IUGG 26th General Assembly, Prague, June 22 – July 2, 2015 3
SOLAR
SOLAR/SolACESCredit: NASA
SDO/EVE
Credit: University of Colorado at Boulder
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Institut für MeteorologieCombination of SDO-EVE and SolACES spectra
IUGG 26th General Assembly, Prague, June 22 – July 2, 2015 4
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Institut für MeteorologieCombined SDO/EVE and SolACES Dataset
IUGG 26th General Assembly, Prague, June 22 – July 2, 2015 5
Extension including TIMED/SEE data in progress
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Institut für MeteorologieEUV-TEC Index calculation (Unglaub et al., 2011)
IUGG 26th General Assembly, Prague, June 22 – July 2, 2015 6
Absorption and primary ionization calculated for 4 major componentsNRLMSISE-00 global mean background atmosphereBased on combined SDO-EVE and SolACES spectra
solar minsolar maxsolar minsolar maxsolar minsolar maxsolar minsolar max
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Institut für MeteorologieEUV-TEC Index calculation (Unglaub et al., 2011)
IUGG 26th General Assembly, Prague, June 22 – July 2, 2015 7
Absorption and primary ionization calculated for 4 major componentsNRLMSISE-00 global mean background atmosphereBased on combined SDO-EVE and SolACES spectra
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Institut für MeteorologieTime series of indices
IUGG 26th General Assembly, Prague, June 22 – July 2, 2015 8
Year
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Institut für MeteorologieTime scale 90 days
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Institut für MeteorologieEUV indices and solar flares
IUGG 26th General Assembly, Prague, June 22 – July 2, 2015 10
EUV-TEC describes short-term TEC variability well
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Institut für MeteorologieFiltered time series
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Institut für MeteorologieTEC delay at different time scales
IUGG 26th General Assembly, Prague, June 22 – July 2, 2015 12
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Institut für MeteorologieTEC delay at different time scales
IUGG 26th General Assembly, Prague, June 22 – July 2, 2015 13
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Institut für MeteorologieTEC delay at different time scales
IUGG 26th General Assembly, Prague, June 22 – July 2, 2015 14
Scale Shift17 – 53 days 1 day54 – 76 days 2 days
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Institut für MeteorologieTEC delay at different time scales
IUGG 26th General Assembly, Prague, June 22 – July 2, 2015 15
Scale Shift17 – 53 days 1 day54 – 76 days 2 days
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Institut für MeteorologieCorrelation of EUV-TEC and TEC
IUGG 26th General Assembly, Prague, June 22 – July 2, 2015 16
Original Modified
Scale Shift17 – 53 days 1 day54 – 76 days 2 days
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Institut für MeteorologieResiduals TEC – EUV-TEC
IUGG 26th General Assembly, Prague, June 22 – July 2, 2015 17
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Institut für MeteorologieResiduals TEC – EUV-TEC
IUGG 26th General Assembly, Prague, June 22 – July 2, 2015 18
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Institut für MeteorologieConclusions
IUGG 26th General Assembly, Prague, June 22 – July 2, 2015 19
• Primary ionization from EUV spectra explains about 70% of TEC variability on an global and seasonal scale
• Ionospheric delay of 1 – 2 days for the solar rotation and longer time scale
• Taking this into account gives better representation of TEC by EUV