---
abstract: |
    We report on [*XMM-Newton*]{} observations of the young open cluster NGC 2547 which allow us to characterise coronal activity in solar-type stars, and stars of lower mass, at an age of 30Myr. X-ray emission is seen from stars at all spectral types, peaking among G-stars at luminosities (0.3–3keV) of $L_{\rm x}\simeq 10^{30.5}$ ergs$^{-1}$ and declining to $L_{\rm x} \leq 10^{29.0}$ egs$^{-1}$ among M-stars with masses $\geq 0.2\,M_{\odot}$. Coronal spectra show evidence for multi-temperature differential emission measures and low coronal metal abundances of $Z\simeq 0.3$. The G- and K-type stars of NGC 2547 follow the same relationship between X-ray activity and Rossby number established in older clusters and field stars, although most of the solar-type stars in NGC 2547 exhibit saturated or even super-saturated X-ray activity levels. The median levels of $L_{\rm x}$ and $L_{\rm
    x}/L_{\rm bol}$ in the solar-type stars of NGC 2547 are very similar to those in T-Tauri stars of the Orion Nebula cluster (ONC), but an order of magnitude higher than in the older Pleiades. The spread in X-ray activity levels among solar-type stars in NGC 2547 is much smaller than in older or younger clusters.

    Coronal temperatures increase with $L_{\rm x}$, $L_{\rm x}/L_{\rm 