Stereographic projections of observations toward the Orion-Eridanus superbubble. The drapery pattern, produced using the line integral convolution technique (LIC; Cabral & Leedom 1993), corresponds to plane-of-the-sky magnetic field orientation inferred from the Planck 353-GHz polarization observations. Left: total integrated Hα emission map. The dashed line indicates the approximate location of the edge of the superbubble. The yellow symbols correspond to the main stars in the Orion constellation. Right: total integrated Hα emission (Gaustad et al. 2001) and HI 21-cm emission (HI4PI Collaboration et al. 2016) integrated between − 20 and 20 km s⁻¹ shown in red and teal colors, respectively. The yellow symbols correspond to the line-of-sight magnetic field directions derived fromthe HI emission-line Zeeman splitting observations (Heiles 1989, 1997). The circles and triangles correspond to magnetic fields pointing toward and away from the observer, respectively. The three white circles in the bottom are the regions analyzed in this Letter.