A mirror of open sky and Earth data
Norrsken Data keeps full copies of openly licensed radio astronomy surveys, satellite imagery, terrain models and weather archives on servers in Sweden. Independent researchers and hobbyists can download them at full speed instead of waiting on the original archives.
- Mirror status
- Online
- Last sync
- 29 Oct 2026, 04:10 CET
- Datasets
- 1,284
- Stored
- 412 TB
Datasets
A selection of the most downloaded collections. Every dataset comes with its original licence, a README from the producer and a checksum file.
| Dataset | Collection | Format | Size | Updated |
|---|---|---|---|---|
| Mars global surface mosaic, 2023 release | Planetary | GeoTIFF | 214 GB | Mar 2024 |
| Lunar topography, 118 m grid | Planetary | GeoTIFF | 38 GB | Jan 2025 |
| Northern sky radio survey, 1.4 GHz continuum | Radio astronomy | FITS | 1.9 TB | Aug 2025 |
| Hydrogen line drift scans, 2019–2025 | Radio astronomy | FITS | 640 GB | Oct 2026 |
| Baltic Sea true-colour imagery, 10 m, 2025 | Earth observation | JPEG 2000 | 3.2 TB | Feb 2026 |
| Scandinavian elevation model, 25 m | Terrain | GeoTIFF | 96 GB | Jun 2025 |
| Hourly surface reanalysis, 1990–2024 | Meteorology | NetCDF | 11.4 TB | Apr 2025 |
| Lightning detections, Northern Europe | Meteorology | CSV | 52 GB | Oct 2026 |
The full catalogue of 1,284 datasets is available after you sign in.
Access
Browsing the catalogue is open to everyone. Downloading needs a free researcher account: a single dataset can be hundreds of gigabytes, and our bandwidth is donated.
We approve accounts by hand, usually within a week. Tell us who you are and which datasets you need.
All downloads run over HTTPS and support resuming. For datasets over 1 TB, use a download manager or wget -c so an interrupted transfer picks up where it stopped.
mars-global-mosaic-2023/ ├── README.txt # producer's notes ├── LICENSE.txt ├── SHA256SUMS ├── index.csv # tile footprints └── tiles/ # 4,096 files ├── N00E000.tif ├── N00E005.tif └── …
Every dataset follows the same layout. Check the files with sha256sum -c SHA256SUMS after downloading.
About
Norrsken Data is run by a small group of volunteers who got tired of slow downloads from the original archives. The servers sit in Sweden, close to the main research networks of Northern Europe.
We are not affiliated with the agencies and observatories that produced the data. We only mirror datasets that are published under open licences, and each one links to its licence and original source.
Questions, broken files or a dataset you would like us to mirror: hello@norrskendata.xyz