Speaker
Description
The Sun exhibits a TeV flux that significantly exceeds theoretical expectations, challenging conventional particle interaction models. In this Letter, we demonstrate that secondary electron-positron ($e^{\pm}$) pairs constitute a crucial and irreducible component of the observed solar signal. Due to their Extensive Air Shower (EAS) morphology being virtually indistinguishable from that of gamma rays in ground-based arrays, this leptonic component has been overlooked in current interpretations. By employing the \textsc{G4Solar} framework with a data-driven Outward Cosmic Ray'' (OCR) injection model, we successfully reproduce the broadband spectra measured by Fermi-LAT and HAWC. Our results show that escaping secondary $e^{\pm}$ contribute approximately 20\% of the total signal in the TeV regime, with a fraction that exhibits a 2--3$\times$ anti-correlation with the solar cycle. This significant temporal evolution motivates our proposal of theCoronal Magnetic Shielding Hypothesis,'' suggesting a cycle-dependent magnetic shielding of primary cosmic rays within the solar corona. Furthermore, we propose a ``Shadow-Center'' reference frame analysis to mitigate magnetic smearing, providing a vital diagnostic tool for future experiments like LHAASO and SWGO to identify this leptonic component and verify the magnetic shielding hypothesis.
