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

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Institut für MeteorologieSDO/EVE and SolACES

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SOLAR

SOLAR/SolACESCredit: NASA

SDO/EVE

Credit: University of Colorado at Boulder

Institut für MeteorologieCombination of SDO-EVE and SolACES spectra

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Institut für MeteorologieCombined SDO/EVE and SolACES Dataset

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Extension including TIMED/SEE data in progress

Institut für MeteorologieEUV-TEC Index calculation (Unglaub et al., 2011)

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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

Institut für MeteorologieEUV-TEC Index calculation (Unglaub et al., 2011)

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Absorption and primary ionization calculated for 4 major componentsNRLMSISE-00 global mean background atmosphereBased on combined SDO-EVE and SolACES spectra

Institut für MeteorologieTime series of indices

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Year

Institut für MeteorologieTime scale 90 days

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Institut für MeteorologieEUV indices and solar flares

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EUV-TEC describes short-term TEC variability well

Institut für MeteorologieFiltered time series

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Institut für MeteorologieTEC delay at different time scales

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Institut für MeteorologieTEC delay at different time scales

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Institut für MeteorologieTEC delay at different time scales

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Scale Shift17 – 53 days 1 day54 – 76 days 2 days

Institut für MeteorologieTEC delay at different time scales

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Scale Shift17 – 53 days 1 day54 – 76 days 2 days

Institut für MeteorologieCorrelation of EUV-TEC and TEC

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Original Modified

Scale Shift17 – 53 days 1 day54 – 76 days 2 days

Institut für MeteorologieResiduals TEC – EUV-TEC

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Institut für MeteorologieResiduals TEC – EUV-TEC

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Institut für MeteorologieConclusions

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• 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