lgdc.uml.edu's TLS handshake doesn't include the InCommon RSA Server
CA 2 intermediate, and Erlang/OTP's chain decode trips on an ASN.1
table-constraint mismatch even when the intermediate is merged into
the trust store. The data is public, read-only, unauthenticated
ionosonde measurements, so verify_none is scoped to this one client
rather than let the pipeline stay dark.
6 additional characterization tests for empty-list upsert paths, station
filter isolation on latest_observation/1, multi-band xray coexistence,
and newest-across-time/bands latest_* helpers.
Adds the missing link between the GIRO ionosonde data we just started
ingesting and the VHF/UHF band scoring:
* `Microwaveprop.Propagation.SporadicE` — ITU-R P.534-6 / Davies 1990
thin-layer Es MUF (sec(i) · foEs with h=110 km), plus an `es_score/3`
that maps (foEs, target band, hop distance) into a 0-100 single-hop
propagation likelihood. Calibrated against literature: 50 MHz Es at
2000 km needs foEs ≳ 5.5 MHz (routine summer); 144 MHz needs
foEs ≳ 15.8 MHz (rare Jun/Jul peaks only); 440 MHz Es does not occur
at physical foEs values. Multi-hop Es and Es-scatter are separate
factors and explicitly out of scope.
* `Ionosphere.nearest_foes/3` — given a lat/lon, returns the latest
observation from the nearest polled GIRO station (Millstone Hill or
Alpena for now), with a configurable staleness cutoff (default 2h).
Returns `{:error, :stale}` or `{:error, :no_data}` so callers can
choose whether to apply the Es factor at all.
Neither is wired into the grid scorer yet — that's a separate commit
so the integration can be reviewed on its own.
First step toward physics-based HF / sporadic-E scoring. Polls GIRO's
DIDBase tabular endpoint every 10 minutes for two US ionosondes
(Millstone Hill MHJ45, Alpena AL945), parses the plain-text response
into observation rows, and upserts into a new ionosonde_observations
table keyed on (station_code, valid_time).
This gets foEs (E-layer sporadic critical frequency) into the database
as a direct measurement — the key input for predicting 144 MHz Es
openings via ITU-R P.534-6. foF2 + MUFD are the F2-layer inputs for
HF MUF predictions.
Not yet wired into scoring. Boulder/Wallops/Austin/Idaho/Point Arguello
are in the GIRO catalog but were silent when probed — add them back
if/when they come online.
Next steps: SWPC JSON (Kp, F10.7, sunspot), GOES X-ray flux, D-RAP text,
and the P.534-6 Es scoring factor that uses foEs at midpoint for the
144/440 band configs.
