This study examines diffuse ultraviolet (UV) emissions in the PHOENIX_00 region near galaxy clusters using GALEX deep observations. In the far-UV (FUV) and near-UV (NUV),we detected backgrounds of 125–200 and 225–350 photon units (PU),with scatters of ±16 and ±22 PU,respectively. A moderate FUV-NUV correlation and FUV/NUV ratio below unity indicate FUV-dominated emission and little molecular hydrogen fluorescence or hot-line contributions. Dust influences the FUV background more strongly than the NUV,and UV band emissions correlate more strongly at Galactic latitudes . Infrared (IR) color ratios IR60/IR100 (≈0.34 ± 0.03) indicate homogeneous large-grain temperatures and depletion of small grains and PAHs, while IR60/IR25 below 3 indicates AGN activity in the region. The non-zero offsets of IR-UV plots 89 PU (FUV) and 199 PU (NUV) indicate the region’s baseline illumination and extragalactic radiation. Approximately 11% of the FUV offset and 23% of the NUV offset come from extragalactic background light, while the rest comes from dust-scattered starlight. Finally,our research shows that the interstellar radiation field directly affects the UV background,with the strength inversely proportional to local dust content.

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