SILSO preserves and distributes the international sunspot number, with current and historical solar observation data.
BASS2000
BASS2000 archives solar observations and lets visitors search data by date.
About BASS2000
BASS2000 is an online archive of solar observations. Visitors can search its records by date, using several date formats such as 28/3/2001, 28-3-01, or YYYYMMDD. The homepage lists recent observations from several sources, including the Meudon Spectroheliograph, SOLAP, the Nancay Decametric Array, MeteoSpace, Climso Pic du Midi, and the Royal Observatory of Belgium (USET). It also names a Heliophysics Feature Catalogue and states that the site is a regular member of WDC-Solar Activity. The homepage shows a last update date of 30 Jul 2026. Pricing is unknown, and the homepage does not state data licensing, coverage period, or usage terms.
Key features
- Date search that accepts several formats, including YYYYMMDD and YYMMDD
- Lists latest observations from multiple solar instruments and observatories
- Nancay Decametric Array dynamic spectra with polarization
- Downloadable Nancay files in .png and .RT1 formats
- Heliophysics Feature Catalogue
- Meudon Spectroheliograph and SOLAP observation listings
Best for: Researchers and students who need solar observation records for specific dates.
Good for
- Records can be located by entering a specific date in several formats
- Observations come from multiple named observatories and instruments
BASS2000 at a glance
- Website
- bass2000.obspm.fr/home.php
- Category
- Research & Data › Open Data & Datasets
- Type
- Website
- Pricing
- Not confirmed. Check the site
- Platforms
- Web
- Open source
- Not stated
- Last checked
- Oct 6, 2026 · Online when checked
- Listed
- Oct 5, 2026
BASS2000 alternatives
Tools and sites you could use instead, ranked by how closely they match.
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DARTS is JAXA’s space science data archive, covering fields including astronomy, solar physics, lunar and planetary science, and microgravity.
NASA’s Solar Dynamics Observatory provides solar imagery and data from instruments studying the Sun’s atmosphere.
FranceSeisme lets users search seismic events by date and geographic coordinates.
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BASS2000 FAQ
How do I search for observations by date?
Enter a date in one of the accepted formats, such as 28/3/2001, 28.3.1, 28-3-01, YYYYMMDD, or YYMMDD.
Which instruments and observatories are listed on the homepage?
The homepage lists the Meudon Spectroheliograph, SOLAP, the Nancay Decametric Array, MeteoSpace, Climso Pic du Midi, and USET-Royal Observatory of Belgium.
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