B. NOAA Solar Radiation Activity Observation and Forecast
Solar radiation, as observed by NOAA GOES-13 over the past 24 hours, was
below S-scale storm level thresholds.
Solar Radiation Storm Forecast for Sep 16-Sep 18 2017
Sep 16 Sep 17 Sep 18
S1 or greater 1% 1% 1%
Rationale: No S1 (Minor) or greater solar radiation storms are expected.
No significant active region activity favorable for radiation storm
production is forecast.
# Global Ionospheric Radio Observatory
# GIRO Tabulated Ionospheric Characteristics, Version 1.0 Revision B
# Generated by DIDBGetValues on 2017-09-13T02:44:48.898Z
# Location: GEO 64.66N 212.93E, URSI-Code EI764 EIELSON
# Instrument: Ionosonde, Model: DPS-4D
# Query for measurement intervals of time:
# 2017-09-13T02:00:00.000Z - 2017-09-13T02:30:00.000Z
# Data Selection:
# CS is Autoscaling Confidence Score (from 0 to 100, 999 if manual scaling, -1 if unknown)
# foF2 [MHz] - F2 layer critical frequency
#Time CS foF2 QD
2017-09-13T02:30:00.000Z 70 4.625 //
Latest 24 Hour Ionogram Movies for Gakona
Ionograms reveal a trace of F2 reflection followed by two more soundings without return signal reflections with an audio recording where during the time period 0200-021UTC net control AL7LX 316 miles south was heard however her signal vanished as propagation failed as indicated in graphs 0215-0230 UTC indicate.
Failure of propagation after 0215 UTC was apparently due to Polar Cap Absorption PCA, though not displayed in the below image, the 1db absorption display indicated a 10 db absorption level for 75 meters.