0.82 V/km · ≈82 V per 100 km
Ground field badge — the actual physical number: the storm-driven
electric field in the ground at that point, in volts per kilometer. Multiply it by
line length to get the voltage a transmission line picks up end-to-end — 0.82 V/km
on a 100 km line aligned with the field ≈ 82 V driving current through it. A
substation is a point, so it has no single induced voltage of its own; the voltage
lives on the lines feeding it. Draw a real line below to get its exact
number.
low · 18
Risk badge — the same physics rolled into a 0–100 convenience score
(ground electric field is the main driver, plus local magnetic activity and storm
proximity). Bands: low <25 ·
elevated 25–50 · high
50–75 · severe ≥75. Relative — not a
calibrated kV value.
NONE WATCH
WARNING ALERT
Alert level — the escalating ladder: NONE nothing
needed → WATCH conditions building (hours of lead) →
WARNING onset likely (~15–45 min) → ALERT underway
now. The suggested-actions checklist keys off this level.
Line badges — V induced is the
storm-driven voltage on a drawn line; ~A/phase is the
estimated current, flagged against the NERC 75 / 85 A-per-phase benchmarks;
GIC blocked means a series capacitor stops it;
your values means you supplied real resistances (no
longer an assumption).
Map — the red circle is the storm epicenter; pins and lines are
colored by band (green → amber → orange → red).
“modeled — no nearby sensor” means the estimate is inferred from the
storm model, not measured at a local magnetometer.
Ground conductivity layer (toggle above the map) — the physical
rock/soil structure feeding the ground-field calculation, from Natural Resources
Canada's regional conductivity models plus survey sites. Warm/red = resistive ground
(a given storm drives a larger electric field); cool/blue = conductive
ground (smaller field). Transparent = no regional data there (a continental-average
assumption is used instead). It's a static property of the ground, not live data.
Connected lines — drawing a line endpoint on (or very near) a pin
connects it to that substation; a dashed ring marks connected pins. The station's
total GIC comes from a network solve, and it is usually less than
the sum of its lines: current that flows in on one line and out on another passes
through the station instead of into the ground. A corridor station with a
line in from the west and out to the east can read near zero even in a strong storm
— that's real physics, not a bug.