What Is Helioviewer and How Do You Use It to View the Sun?

Helioviewer is a browser-based solar and heliospheric image visualization tool that lets you browse Sun imagery from multiple data sources, stack layers on top of each other, and export what you see as a screenshot or movie. It suits anyone who wants to look at current or historical solar observations without installing software — students, educators, space-weather watchers, or researchers who need a quick visual reference. You only need a modern browser; the interface loads the imagery for you.

What Helioviewer actually does

The tool presents solar images as layers drawn from different instruments and data sources. You control which layers are visible, the observation date and time, and the field of view. On top of that, it adds context tools:

• Images & Layers — the core view, where you add or remove data layers and apply layer presets.
• Features & Events — overlays tied to solar activity and events.
• Celestial Bodies — reference positions for bodies in the frame.
• Image Timeline and Events Timeline — scrub backward or forward through time (the interface shows 7-day jumps, with a logarithmic view option).
• Visual Glossary — explains what the imagery and terms mean.

This layering model is the key mechanism: instead of one fixed picture, you build a composite view and then export it.

Viewing the Sun step by step

1. Set the observation date. Use the Observation Date control (UTC) and the NEWEST jump to return to the latest available data. The timeline lets you move in 7-day steps or switch to a logarithmic view for wider spans.
2. Add layers. Open Images → Add Layer or start from a layer preset. Each layer corresponds to a data source; toggle them to compare what different instruments show.
3. Add context if needed. Turn on Features and Events to mark activity, or Celestial Bodies to show reference positions.
4. Adjust the view. Use the zoom controls and the 3D toggle, and pan by dragging. The viewport coordinates (X/Y) are displayed.
5. Check what you're looking at. If a layer or term is unfamiliar, open the Visual Glossary or the User's Guide from the help menu.

Expected result: a layered, time-stamped view of the Sun that you can navigate freely before exporting.

Creating a screenshot or movie

Both exports live in the same panel and share a Full Viewport vs Select Area choice — pick the whole frame or drag out a region.

Screenshot: choose the area, generate it, and it's added to your screenshot history. From there you can share it to X, Facebook, or Pinterest, or copy/email a link.

Movie: choose the area, then set:

Duration is centered on your current observation time. You can also set explicit Start and End UTC values. Generated movies appear in your movie history, and shared movies can be viewed on YouTube.

Sharing and exporting data

• Share link to current viewport — copies a link to exactly what you're looking at. If the link goes stale, the interface prompts you to update it.
• Virtual Solar Observatory (VSO) — request viewport images or an image sequence for a start/end date range, and get SunPy or SSW scripts alongside the VSO website link.
• SDO AIA/HMI Cut-out Service — request an image sequence, optionally for a selected area with a center (x, y) in arcseconds and a width/height, and receive an SSW script plus the service website.

These export paths are useful when you want the underlying data or a reproducible script rather than just a picture.

Common snags and where to get help

• A share link stops working — the tool flags it as stale; click to update it before copying again.
• No movies found around a date — the movie list is tied to the observation date, so move the date or widen the range.
• Unfamiliar layer or event — check the Visual Glossary first, then the User's Guide.
• Something looks wrong or won't load — use Report Problem or the Contact link; the site also publishes Status and Coverage pages so you can check whether data is missing on the source side.

For programmatic or advanced use, the Public API Documentation and JHelioviewer (the desktop counterpart) are linked from the same help area. Keyboard shortcuts are documented if you want to navigate faster.