I found an interesting dataset of the heatwaves on the MERRA-2 web site (https://fluid.nccs.nasa.gov/reanalysis/extreme_merra2/?one_click=1&tau=00&stream=CCDI&level=0®ion=europe&fcst=20201201&field=hwfmean), but on this site, it's possible only the download the image.
Where can I also download the data set for Europe?