SAA Manual Labeling Tool

1. Scan all three panels. A South Atlantic Anomaly pass shows as a raised region — it is often much clearer in ddsi or ddsi×hardness than in flux, so check every panel before deciding.
2. What a pass looks like. A tall, narrow, jagged spike. Narrow because the whole day is on one screen — a pass lasting 10 to 30 minutes only comes out a few millimetres wide. Jagged because its top edge jumps up and down instead of coming to a clean point.
3. The big ones are obvious. Same jagged spike, shooting far above everything else on the screen. You will not miss these.
4. The small ones look exactly the same, just shorter. Still a narrow jagged spike, but rising only a little way above the baseline instead of far above it. That is why you cannot go by height alone. Scroll to zoom in on anything that pokes up even slightly and check how wide it is: a pass stays wide as you zoom, noise shrinks to a hairline. The evenly spaced rounded humps that repeat all day are not passes — that is high-latitude radiation near the poles.
5. The dashed line. Anything above it is almost certainly a pass, so use it to pick off the easy ones quickly. Below the line tells you nothing — about a quarter of passes never get that high — so go back and hunt underneath it too.
6. Put your name in the Volunteer box at the top of the page — you cannot save a label without it. Then click anywhere in a panel where the pass begins.
7. Click again where it ends.
8. Drag either edge to fine-tune, then press Save label.
9. Repeat for every pass you can see, then Mark day complete.

Scroll to zoom, shift-drag to pan, Esc clears a selection. All times are UTC. There are typically around 11 passes per day, but some are too weak to see — only label what you can actually identify. Missing an invisible pass is expected and is not an error.