Value chain · CLM-1381
In plain terms
NOAA's own table confirms the storm-day counts the register was using: about 130 strong, 60 severe and 4 extreme storm days in an average 11-year cycle.
The claim as recorded
NOAA's G-scale table gives average frequencies per 11-year cycle of 200 storm events on 130 days for G3, 100 events on 60 days for G4, and 4 events on 4 days for G5, under the column heading "Number of storm events when Kp level was met; (number of storm days)". These are the 130, 60 and 4 days that CLM-0118 (low confidence) carried from SRC-135's locator note, now read at the table.
Evidence behind this: T3: an agency's published scale and table, not a peer-reviewed measurement.
Scope and limits
The page does not say whether each count covers only that class or every day at or above that Kp level. If the counts are cumulative, G3 and above is 130 days per cycle, or 130 / 11 = 11.8 days per year, and CLM-0118 (low confidence)'s 17.6 double-counts G4 and G5. This is UNVERIFIED either way; the explanation page the PDF prints (https://www.spaceweather.gov/noaa-scales-explanation) is not held. The aurora-latitude proxy in CLM-0118 (low confidence) is untouched by this record.
What it assumes
that the class counts are exclusive (days at Kp 7 alone for G3), which summing requires
Where it comes from
PDF p.1: column "Average Frequency (1 cycle = 11 years)"; heading "Number of storm events when Kp level was met; (number of storm days)"; G3 "200 per cycle (130 days per cycle)"; G4 "100 per cycle (60 days per cycle)"; G5 "4 per cycle (4 days per cycle)". Arithmetic: 130 + 60 + 4 = 194 days per cycle; 194 / 11 = 17.6 days per year, as CLM-0118 (low confidence) states.
Basis: average frequency per 11-year solar cycle
Related records
- Answers question
- QST-009 not published in this release
Cite this
energyaperture.com/c/clm-1381
CLM-1381, Energy Aperture, as of 2023-12-11.
Connected records
Other published records linked to this one. A list, not a judgement.