Ionogram

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

R1

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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 15-Sep 17 2017

              Sep 15  Sep 16  Sep 17
S1 or greater   35%     10%      1%

Rationale: The greater than 10 MeV proton flux is expected to remain
below S1 levels, with a chance for a return to S1 levels on day one (15
Sep) as the radiation storm continues to weaken. A return to background
values is expected by Day 2 (16 Sep) as the solar radiation storm
subsides.

 

# Global Ionospheric Radio Observatory

# Global Ionospheric Radio Observatory
# GIRO Tabulated Ionospheric Characteristics, Version 1.0 Revision B
# Generated by DIDBGetValues on 2017-09-15T03:14:57.421Z
#
# Location: GEO 64.66N 212.93E, URSI-Code EI764 EIELSON
# Instrument: Ionosonde, Model: DPS-4D
#
# Query for measurement intervals of time:
# 2017-09-15T02:00:00.000Z - 2017-09-15T02:30:00.000Z
#
# 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
2017-09-15T02:00:00.000Z  65  4.025 //

 

# foF1 [MHz] - F1 layer critical frequency
#
#Time                     CS  foF1 QD

 

# foEa [MHz] - Critical frequency of auroral E-layer
#
#Time                     CS  foEa QD
2017-09-15T02:30:00.000Z  20  3.67 //

 

 

 

Latest 24 Hour Ionogram Movies for Eielson AFB Latest 24 Hour Ionogram Movies for Eielson AFB

 

 

Observations

Propagation Marginal to None

Ionograms reveal initially scares signal reflections with no return signal reflections at 15 minutes after net began. Recorded transmission were of local ground wave stations being check in by propagation by weak station below the Alaska Range.

 

Hypothesis 

Marginal propagation due to Polar Cap D-Layer signal attenuation for central Alaska and other areas north of 60 degrees north latitude as shown in the image below. 

 

 

 

 Polar Cap Absorption

Being an artifact of  Proton event.

GOES PROTON FLUX

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