Authors: Surajit Mondal (NJIT), Bin Chen (NJIT) , Dale Gary (NJIT) , Peijin Zhang (NJIT,UCAR), Gregg Hallinan (Caltech) and the OVRO-LWA team

The middle corona is the transition region of several key physical processes. In spite of this, it has not been studied as much as it ought to be, particularly because of the observing limitations. White-light and low frequency radio observations are the primary tools to probe this region. Low frequency radio observations due to their high sensitivity to nonthermal particles, are particularly suited for suited for understanding the origin and transport of the nonthermal electrons in this region. However due to the lack of regular high dynamic range imaging, low frequency radio studies have mostly been limited to studying bright solar radio bursts. With the commissioning of the Owens Valley Long Wavelength Array (OVRO-LWA), this scenario has now changed. Using the high dynamic range snapshot images from the OVRO-LWA, we have detected multiple large scale weak radio transients. These emissions span a very large heliocentric distance, from about 2-7 solar radii, and have lifetimes of a few tens of minutes to about an hour. However, unlike the radio CMEs, which show a clear spatial and temporal association with CMEs, we only detect very weak white light signatures corresponding to these radio emissions. We demonstrate that these emissions are mostly caused by gyrosynchrotron emission by a population of nonthermal electrons. This showcase the power of low frequency radio observations in unveiling the hidden population of the nonthermal electron population in the middle corona.