The Best WDC Sunspot Index and Long-term Solar Observations Alternatives in 2026

DIRENO is Lower Austria's scholarly repository for collecting and preserving digital assets, including current and historical regional literature.

BASS2000 archives solar observations and lets visitors search data by date.

The Leibniz Institute for Solar Physics data centre stores and manages open solar observations and magnetohydrodynamic simulations.

The International University of Andalusia repository organizes academic works, historical collections, and teaching innovation materials.

AUB ScholarWorks collects, preserves, and distributes digital materials through American University of Beirut repositories.

The Bremen Core Repository preserves cores from international scientific ocean drilling programs at the University of Bremen.

Volare is Vorarlberg’s state library repository for offering and preserving historical photographs and other digital objects.

Data.Brno presents city information through long-term and real-time series, open data formats, applications, surveys, and Brno in Numbers.

Search arrayMap for copy-number variation profiles by cancer type, sample, or disease classification.

Amsterdam’s municipal data site provides current city information and lets visitors search streets, buildings, public spaces, map layers, and datasets.

The Martha’s Vineyard Coastal Observatory shares current conditions and downloadable wave, temperature, pressure, wind, and tide data.

DARTS is JAXA’s space science data archive, covering fields including astronomy, solar physics, lunar and planetary science, and microgravity.

IERS provides data on Earth rotation, reference systems, and geophysical fluids, with models, standards, and current bulletins.

The Northern California Earthquake Data Center archives and distributes digital data from seismic and other geophysical sensors.

The IPGP Data Center manages and distributes data from geophysical networks, including seismic, accelerometric, and environmental records.

NASA’s Solar Dynamics Observatory provides solar imagery and data from instruments studying the Sun’s atmosphere.

The Moscow center provides data on geomagnetic variations, ionospheric phenomena, solar activity, and cosmic rays.

Japan's National Tax Agency portal lets users search corporate names, addresses, and identification numbers and download the listed records.

The International Aid Transparency Initiative provides tools to explore aid data about development and humanitarian resources and their results.

The International Service for the Geoid provides geoid data, conversion tools, software downloads, and documentation from its geoid school.

Openaid visualizes Swedish international aid data, including payments, recipients, purposes, and reported results.

DARWIN publishes observation data and sample information from JAMSTEC research vessels and submersibles, with cruise and dive information.

The Partnership for Interdisciplinary Studies of Coastal Oceans is an academic consortium researching the California Current coastal ocean.

The ReefTEMPS observation network monitors tropical island coastal waters and provides access to related data services.