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The nearby radio pulsar B0950$+$08 with full duty cycle is targeted by theFive-hundred-meter Aperture Spherical radio Telescope (FAST, 110 minutesallocated), via adopting polarization calibration on two ways of baselinedetermination, in order to understand its magnetospheric radiation geometry aswell as the polar cap sparking. % The radiation of the main pulse could not beinformative of magnetic field line planes due to its low linear polarization($<10 \%$) and the position angle jumps, and the polarization position angle inthe pulse longitudes whose linear fractions are larger than $ \sim 30 \%$ isthus fitted in the classical rotating vector model (RVM). % The best RVM fitindicates that the inclination angle, $\alpha$, and the impact angle, $\beta$,of this pulsar are $100.5^{\circ}$ and $-33.2^{\circ}$, respectively,suggesting that the radio emission comes from two poles. % Polar cap sparkingin the vacuum gap model, either the annular gap or the core gap, is thereforeinvestigated in this RVM geometry, resulting in a high-altitude magnetosphericemission at heights from $\sim 0.25R_{\rm LC}$ to $\sim 0.56R_{\rm LC}$, with$R_{\rm LC}$ the light cylinder radius. % It is evident that both sparkingpoints of the main and inter pulses are located mainly away from the magneticpole, that is meaningful in the physics of pulsar surface and is even relevantto pulsar's inner structure.

Radio pulsar B0950$+$08: Radiation in Magnetosphere and Sparks above Surface