3,- 1JBCA, Dept. Physics and Astronomy, University of Manchester, UK
- 2School of Physics and Astronomy, Cardiff University, UK
- 3Jet Propulsion Laboratory, California Institute of Technology, Pasadena, USA
- 4Astrophysics Group, Department of Physics, Imperial College London, UK
- 5Max-Planck-Institut für Radioastronomie, Bonn, Germany
- 6Department of Physics and Electronics, Rhodes University, South Africa
- 7NARIT, Chaing Mai, Thailand
We present a collection of radio-frequency observations of Venus, investigating its solid surface temperature profile and dielectric properties.
Observations at wavelengths >∼4 cm1 can image the surface of Venus below its hot, dense clouds. Emission is received from depths up to ∼10x the wavelength, polarised by the minerological properties of the lithosphere.
Imaging reveals spectral index and polarisation variations associated with Venusian surface features. We are also collating observations from our projects and the literature to provide a large dataset covering total flux density measurements across a wide range of ground-penetrating wavelengths at different epochs, investigating dependence on the presenting hemisphere of Venus. New observations surprising behaviour at wavelengths of tens cm. The Figure shows new ASKAP data (2015) compared with the GMRT measurements by Mohan et al. in 2004. These contribute to constraining the gradient of properties with subsurface depth and thus the composition.
Some of these observations were taken associated with ORP2 proposal M001. This covered wavelengths from 2 m to the UV, with one aim to look for correlations between cm-mm wave observations of atmospheric reduced gasses, and surface features. This complements an ongoing JCMT monitoring project, see W. Tang presentation.
1 Including dedicated and serendipitous observations using ASKAP, Effelsberg, TNRT, MeerKAT and e-MERLIN plus archive and published data from the VLA and GMRT (e.g. Hugo B. and Perley R. 2024 https://archive-gw-1.kat.ac.za/public/repository/10.48479/bqk7-aw53/index.html; Akins et al. 2025LPICo3090.2366A; Butler et al. 2001Icar..154..226B; Mohan et al. 2019MNRAS.487.4819M )
^2 Opticon RadioNet Pilot
How to cite: Richards, A. M. S., Greaves, J. S., Akins, A., Clements, D. L., Kraus, A., Legodi, P., Pimpanuwat, B., and Tang, W.: New Radio Insights into Venus, Europlanet Science Congress 2026, The Hague, The Netherlands, 7–11 Sep 2026, EPSC2026-1077, https://doi.org/10.5194/epsc2026-1077, 2026.
