  There are several methods for indirectly detecting exoplanets, such as
transit, radial velocity, astrometry, and the conventional gravitational
microlensing approach. These methods rely on observing the effects of
exoplanets on the emission or motion of observed stars. All these techniques
have focused on the optical or infrared domains. However, an alternative method
for exoplanet detection via microlensing events involves planets orbiting the
source star, creating a binary source system. In this study, we explore a novel
approach to detecting and studying exoplanets exclusively through their radio
emissions resulting from magnetospheric processes. We propose utilizing the
Roman telescope as a survey observer to detect microlensing events.
Subsequently, we investigate the potential for detecting planetary radio
signals through follow-up observations of these microlensing events in the
radio band using the SKA telescope. This method is viable due to the comparable
radio emission levels of exoplanets and their parent stars, unlike optical and
infrared emissions. We conduct a Monte Carlo simulation to replicate the
observations by the Nancy Roman Telescope, followed by a follow-up observation
in radio frequencies using the SKA telescope. We determine that approximately
1317 exoplanets exhibit detectable signals by the SKA telescope during the
7-season observations by the Nancy Roman Telescope. This result indicates that
such a method cannot only facilitate the direct detection of exoplanets but
also enable the measurement of their magnetic field strength through analysis
of their radio emissions.
