DPS-4D EI764 064 / 64.630750, -147.042904

Propagation for Snipers Net 3920 KHz 0200 UTC (Net Roster)

Receiver Audio Location - 64.6 / 147.4

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(Audio from band conditions beginning to recover a function of receiving by mobile operations.)



B. NOAA Solar Radiation Activity Observation and Forecast

Solar radiation, as observed by NOAA GOES-13 over the past 24 hours, was
above S-scale storm level thresholds.

Solar Radiation Storm Forecast for Sep 14-Sep 16 2017

              Sep 14  Sep 15  Sep 16
S1 or greater   95%     80%     60%

Rationale: The greater than 10 MeV proton flux is expected to continue
at S1 (Minor) levels on day one (14 Sep), then decrease below the 10 pfu
warning threshold as the radiation storm diminishes.


# Global Ionospheric Radio Observatory

# GIRO Tabulated Ionospheric Characteristics, Version 1.0 Revision B
# Generated by DIDBGetValues on 2017-09-14T02:52:58.914Z
# Location: GEO 64.66N 212.93E, URSI-Code EI764 EIELSON
# Instrument: Ionosonde, Model: DPS-4D
# Query for measurement intervals of time:
# 2017-09-14T02:00:00.000Z - 2017-09-14T02:30:00.000Z
# 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
2017-09-14T02:00:00.000Z  65  3.626 //
2017-09-14T02:15:00.000Z  70  3.850 //
2017-09-14T02:30:00.000Z  70  3.725 //




Latest 24 Hour Ionogram Movies for Eielson AFB




Propagation Moderate

Ionograms reveal small return signal reflections as revealed by recorded transmission from stations 300 miles south of Alaska Range.


Hypothesized Conclusion

Increase in propagation over previous days may be due to further northward displacement of area affected by Polar Cap Absorption thus decreasing D-Layer signal attenuation.




 Polar Cap Absorption



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