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Bubbles, the semi-circular voids below quiescent prominences (filaments),have been extensively investigated in the past decade. However, hitherto themagnetic nature of bubbles cannot be verified due to the lack of on-diskphotospheric magnetic field observations. Here for the first time, we find andinvestigate an on-disk prominence bubble around a filament barb on 2019 March18 based on stereoscopic observations from NVST, SDO, and STEREO-A. Inhigh-resolution NVST H$\alpha$ images, this bubble has a sharp arch-likeboundary and a projected width of $\thicksim$26 Mm. Combining SDO and STEREO-Aimages, we further reconstruct 3D structure of the bubble boundary, whosemaximum height is $\thicksim$15.6 Mm. The squashing factor Q map deduced fromextrapolated 3D magnetic fields around the bubble depicts a distinctarch-shaped interface with a height of $\thicksim$11 Mm, which agrees well withthe reconstructed 3D structure of the observed bubble boundary. Under theinterface lies a set of magnetic loops, which is rooted on a surroundingphotospheric magnetic patch. To be more persuasive, another on-disk bubble on2019 June 10 is presented as a supplement. According to these results obtainedfrom on-disk bubble observations, we suggest that the bubble boundarycorresponds to the interface between the prominence dips (barb) and theunderlying magnetic loops rooted nearby. It is thus reasonable to speculatethat the bubble can form around a filament barb below which there is aphotospheric magnetic patch.

Reconstructing 3D Magnetic Topology of On-disk Prominence Bubbles from Stereoscopic Observations