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
Observations
Propagation Failure
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.
Conclusion
Hypothesized Reason
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.
