How to download 1 Hz GNSS VTEC data?

[ardenveylin]

Hello,
I would like to download high-resolution Total Electron Content (TEC) data, for example with a 1 Hz sampling rate. Is there any website or database that provides such data directly, or do I need to process raw GNSS observation files (RINEX) to obtain it?
Thank you for your help!

[CDDIS - rlimbach]

The CDDIS has ionosphere total electron content maps available in our archive. Information on these files is found here: https://www.earthdata.nasa.gov/data/space-geodesy-techniques/gnss/atmospheric-products

Information on downloading CDDIS data is found here: viewtopic.php?t=6745