Seasonal Variability of Relationship between Main Ionospheric Characteristics and Solar/Geomagnetic Indices via Graphical Models of Conditional Independences

0542980 - ÚFA 2022 DE eng A - Abstract
Podolská, Kateřina - Koucká Knížová, Petra - Chum, Jaroslav
Seasonal Variability of Relationship between Main Ionospheric Characteristics and Solar/Geomagnetic Indices via Graphical Models of Conditional Independences.
EGU General Assembly 2021 (vEGU21: Gather Online). Göttingen: European Geosciences Union, 2021.
[EGU General Assembly Conference 2021. 19.04.2021-30.04.2021, online]
Institutional support: RVO:68378289
Keywords : ionosphere * magnetosphere * ionospheric foF2 variations * solar cycle
OECD category: Meteorology and atmospheric sciences
https://meetingorganizer.copernicus.org/EGU21/EGU21-8453.html

We investigated seasonal variations of relationships between main ionospheric characteristics and
solar and geomagnetic indices in longitudinal perspective. We consider statistically significant
differences in connections of ionospheric response to the F10.7cm, R, and Kp indices on seasonal
time-scales during years 1975 – 2010 covering 21st – 23rd Solar Cycles. The periods of 21 days
before and after Winter/Summer Solstices and Vernal/Autumnal Equinoces are considered as
season. The foF2 time series in our analysis represent measurements of daily observational data
which were obtained using mid-latitude (41.4°N – 54°N) ionosondes (Chilton, Slough RL052/SL051,
Juliusruh/Rugen JR055, Boulder BC840). We used local time noon 5-hour foF2 averages. For the
investigation, we used seasonal differences method of conditional independence graphs (CIG)
models. Significant seasonal variations are visible during ascending and descending phases of
Solar cycles.

Permanent Link: http://hdl.handle.net/11104/0320297