The “9th International Workshop on Planetary, Solar and Heliospheric Radio Emissions” was held in September 2022 in Dublin, Ireland, in continuation of an established tradition following previous successful international workshops held in Austria, in 1984, 1987, 1991, 1996, 2001, 2005, 2010, and 2016. The proceedings of this workshop are now available as the book “Planetary, Solar and Heliospheric Radio Emissions IX (PRE IX)”, which is a continuation of the “PRE silver series” issued by the Austrian Academy of Sciences Press (http://austriaca.at/pre). All contributions were double peer-reviewed under the guidance of the five editors C. K. Louis, C. M. Jackman, G. Fischer, A. H. Sulaiman, P. Zucca. Traditionally the PRE meetings were held in or close to Graz in the province of Styria, which is also called the “green heart” of Austria. For 2022, the conference was held in Dublin, Ireland (the “green or emerald island”), hosted by scientists from the Dublin Institute for Advanced Studies (DIAS). Irish colleagues have expertise across solar, planetary, heliospheric and exoplanet science, and Ireland hosts the I-LOFAR radio telescope. We do not know where the next PRE meeting will take place, but for the future it is planned to move from country to country each time. For more than three decades the developments in the field of planetary solar, heliospheric and exoplanetary radio emissions have been documented in the PRE proceedings. The new volume PRE IX contains articles about observations, simulations or predictions of radio emissions from the Solar System planets (e.g., the Earth, Jupiter, Saturn and Uranus), the Sun, the heliosphere, exoplanets and the interplanetary medium. A large number of contributions deal with observations from recent spacecraft (such as Cassini, Juno, Parker Solar Probe or Solar Orbiter), but also from large ground-based radio observatories (LOFAR, NenuFAR, UTR-2, LWA, NDA and others). The PRE IX volume contains 31 double peer-reviewed manuscripts, 1 extended abstract (not peer-reviewed) and the 57 submitted abstracts (also not peer–reviewed). The editorial team would like to thank all the referees that contributed to the review of the 31 manuscripts of this proceedings book: (in alphabetical order) S. Badman, F. Bagenal, H. Becker, B. Cecconi, G. Clarke, W. Dunn, E. Echer, W. Farrell, P. Galopeau , C. Higgins, G. Hospodarsky, M. Imai, J. Kinrade, K. Kozarev , J. LaBelle, P. Louarn, R. Lysak, G. Mann, Y. Martos, D. McKenna, J.D. Menietti, D. Morosan, P. Murphy, R. Mutel, M. Pérez-Torres, D. Pisa, R. Prangé, H.O. Rucker, K. Sasikumar Raja , R. Schreiber, U. Taubenschuss, R. Treumann, H. Vedantham, C. Vocks, A. Vourlidas, J. Waters, S. Wu, S. Ye, P. Zhang, and all the other anonymous referees. The editorial team would also like to thank Edie Davis from Trinity College Dublin, for her help with the online posting and DOI attribution for each peer–reviewed article. The Editors: C. K. LOUIS C. M. JACKMAN G. FISCHER A. H. SULAIMAN P. ZUCCA