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Ionosphere Sensitivity and Irregular Structures in the Caucasus

Explore ionosphere sensitivity to geomagnetic events and irregular structures in the Caucasus using data from Abastumani Astrophysical Observatory, Tbilisi. Study long-term trends and irregularities in ionospheric parameters, with emphasis on F2 region disturbances. Investigate the impact of atmospheric waves on electron density variations. Monitoring TEC using GNSS data aids in understanding atmosphere-ionosphere coupling in the Caucasus region. Acknowledgments to Georgian Shota Rustaveli National Science Foundation.

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Ionosphere Sensitivity and Irregular Structures in the Caucasus

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  1. 20 - 24 May 2019, Trieste, Italy Sensitivity of the ionosphere parameters long-term variations and its irregular structures in the Caucasus on geomagnetic activity Abastumani Astrophysical Observatory Tbilisi, Georgia Goderdzi DIDEBULIDZE

  2. Determine of ionosphere sensitivity on geomagnetic events in the Caucasus -The sensitivity of long-term trends of hmF2, NmF2 and I630on geomagnetic activity. -Annual and inter-annual variations. • The irregular structures of the ionosphere • F2 region observed during geomagnetic • disturbances (TIDs, TADs) • Data set: • Abastumani Astrophysical Observatory • the oxygen red 630.0 nm and • the green 557.7nm line intensities , • Tbilisi ionosphere station (41.65N, 44.75E) • –hmF2, NmF2 • Development: TEC, GNSS receivers data.

  3. Trend estimation in the upper atmosphere-ionosphere parameters Regression equation: Solar indices Didebulidze et al., IJRS, 2011 Bremer and Berger, JASTP, 2002 Bremer, Ann. Geophys., 1998

  4. Trend estimation in the upper atmosphere-ionosphere parameters Regression equation: Semi-annual variations Annual variations Geomagnetic variations Solar indices Didebulidze et al., IJRS, 2011 Bremer and Berger, JASTP, 2002 Bremer, Ann. Geophys., 1998

  5. Annual and semi-annual variations in Tbilisi ionosphere station data hmF2: Months

  6. Annual and semi-annual variations in Tbilisi ionosphere station data foF2: Months

  7. Figure 2.The inter-annual distribution of the nightglow intensity of the atomic oxygen OI red 630.0 nm line obtained from Abastumani during 1957-1993 at all (white circles and dashed line), solar activity maximum (stars and thick line) and minimum (dark circles and thin line) phases.

  8. The inter-annual distribution of the nightglow intensity of the atomic oxygen OI green 557.7 nm line obtained from Abastumani during 1957-1993 at all (white circles and dashed line), solar activity maximum (stars and thick line) and minimum (dark circles and thin line) phases.

  9. Long-term trend in the red 630.0 nm line nightglow intensity

  10. Atmospheric Gravity Waves (AGWs) Atmospheric Shear Waves (AGWs)

  11. The F2 layer electron density under the influence of inclined (kz≠0) propagation of AGW Equation for Ne(h,t): Solution:

  12. Atmospheric gravity waves insituexcitation in the inhomogeneous horizontal wind

  13. Summary • -In the Caucasus the upper atmosphere-ionosphere parameters long-term trends observed from Abastumani Astrophysical Observatory shows its sensitive to planetary geomagnetic events. -The annual and semi-annual variation of these parameters also sensitive to geomagnetic disturbances; • The observed irregular structures in the ionosphere parameters like TIDs and TADs caused by atmospheric waves evolving in the thermospheric wind can cause regional peculiarities of its development during geomagnetically disturbed days. The close to real time monitoring of the TEC using the set of GNSS receivers data is important for revealing lower-upper atmosphere-ionosphere coupling processes and their specification in the Caucasus. Acknowledgement: This study is supported by Georgian ShotaRustaveli National Science Foundation Grant no. FR17-357.

  14. Thank you! 21 May 2019, Trieste, Italy

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