Speaker
Description
Understanding how magnetic activity drives ultraviolet (UV) irradiance variability is important for the advancement of space weather forecasting and modeling. In this study, we explore the dynamic relationship between solar magnetic flux density (MFD) and 133.5nm UV irradiance , with solar activity proxies ( f10.7cm radio flux, Mg II index, and Ca II K-line) during the ascending phase of Solar Cycle 25. we applied several methodologies such time-series analysis and statistical correlation techniques from different data sources such as SDO. The results of the analysis capture both linear trends and time-frequency dependencies. They reveal strong linear (r = 0.94–0.96) and monotonic (ρ = 0.85) relationships between MFD and UV irradiance, confirming that magnetic fields are key drivers of radiative variability. Temporal analysis shows a clear hierarchy between MFD and F10.7 cm lead UV irradiance by about four days, which in turn precedes chromospheric responses (Mg II and Ca II K) by three days. The wavelet analysis further explains these relationships, showing synchronized 16–32 day variability tied to solar rotation, which highlights strong periodic and synchronized variability across different solar atmospheric layers. The demonstrated relationships significantly improve our ability to predict space weather impacts on Earth’s upper atmosphere, from ionospheric disturbances to satellite drag, underscoring the value of multi-wavelength solar monitoring for operational space weather forecasting.
| Stream | Science or Engineering |
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