An Updated Catalog of IPS Radio Sources Observed by MEXART at 140 MHz for Space Weather Studies

The Mexican Array Radio Telescope (MEXART) is an instrument dedicated to performing interplanetary scintillation (IPS) observations at 140 MHz. After the MEXART backend’s digitization, the array’s technical capabilities have improved substantially, and we observe new IPS sources. By analyzing observations recorded from June 2020 to June 2022, we present an updated catalog of radio sources observed with an IPS signature by MEXART. First, we implemented an algorithm to treat the noise presented by some channels in the frequency. Next, we obtained the spectra of the observations to get the frequency of the Fresnel’s knee and determine whether each radio source exhibited IPS. We then estimated the source’s flux at 140 MHz by interpolating flux density data to different frequencies using the NASA/IPAC Extragalactic Database. Finally, we present a list of 38 radio sources showing IPS signatures. The source list presents declination, right ascension, and flux at 140 MHz. This updated catalog will allow studies of solar wind properties in the inner heliosphere using MEXART data.