<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-01-28 -028 00:40:00.000"
URSICode="SAA0K"
StationName="SaoLuis"
GeoLatitude="-2.6"
GeoLongitude="315.8"
Source="Ionosonde"
SourceType="DPS-4"
ScalerType="auto">
<SystemInfo UMLStationID="903">
<FrequencyStepping StartFrequency="1.0" StopFrequency="18.0">
<LinearStepping Step="0.05" Units="MHz" />
</FrequencyStepping>
<RangeStepping StartRange="80.0" StopRange="1360.0" >
<LinearStepping Step="5.0" Units="km" />
</RangeStepping>
<AutoScaler Name="Artist5" Version="500200" ArtistFlags="2 2 0 0 0 0 0 0 0 33 1 0 0 0 0 0 0 0 1 0 "/>
<Comments>AR.5002.44 Confidence: 60% PACIFIC flags: Moderate F-spread, Multiple candidates for F2x cusp, Multiple candidates for F2o cusp, One of F2 cusps was derived from the other, Unidentified traces above foF2</Comments>
<ContactPerson>
<Name>Dr. Mangalathayil Ali Abdu</Name>
<Affiliation>INPE, Division of Aeronomy</Affiliation>
<Address>Av dos Astronautas, 1.758 Jd. Granja - CEP: 12227-010 Sao Jose dos Campos - SP Brasil</Address>
<Email>maabdu@dae.inpe.br</Email>
</ContactPerson>
<StartTime Format="yyyy.MM.dd (DDD) HH:mm:ss" TimeZone="Coordinated Universal Time" >
2026.01.28 (028) 00:40:00</StartTime>
<SolarTerrestrialData>
<GyroFrequency Val="0.63" Model="IGRF 3.0" Altitude="300"/>
<DipAngle Val="-11.12" Model="IGRF 3.0" Altitude="300"/>
<DeclinationAngle Val="-19.74" Model="IGRF 3.0" Altitude="300"/>
<SunSpotNumber Val="-1.0" Status="predicted"/>
</SolarTerrestrialData>
<DigisondePreface Format="FF">
FF202602801280040009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="24" >
<URSI ID="00" Val="8.200" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="3.146" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="25.801" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="3.800" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="3.800" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="8.700" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="355.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="355.000" Name="h`F2" Units="km" QL="/" DL="/" />
<URSI ID="90" Val="110.000" Name="hmE" Units="km" QL="/" DL="/" />
<URSI ID="83" Val="20.000" Name="yE" Units="km" QL="/" DL="/" />
<URSI ID="86" Val="0.150" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="8.050" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="377.123" Name="h`(fMUF)" Units="km" QL="/" DL="/" />
<Modeled Name="foEp" Val="0.354" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="3.800" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="3.800" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="346.846" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="325.174" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="5.270" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="34.804" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="6.302" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="15.863" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="47.640" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.000" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="1">
<Trace Type="standard" Layer="F2" Polarization="O" Num="89">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
3.8 3.85 3.9 3.95 4.0 4.05 4.1 4.15 4.2 4.25 4.3 4.35 4.4 4.45 4.5 4.55 4.6 4.65 4.7 4.75 4.8 4.85 4.9 4.95 5.0 5.05 5.1 5.15 5.2 5.25 5.3 5.35 5.4 5.45 5.5 5.55 5.6 5.65 5.7 5.75 5.8 5.85 5.9 5.95 6.0 6.05 6.1 6.15 6.2 6.25 6.3 6.35 6.4 6.45 6.5 6.55 6.6 6.65 6.7 6.75 6.8 6.85 6.9 6.95 7.0 7.05 7.1 7.15 7.2 7.25 7.3 7.35 7.4 7.45 7.5 7.55 7.6 7.65 7.7 7.75 7.8 7.85 7.9 7.95 8.0 8.05 8.1 8.15 8.2
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
355.000 355.000 355.000 355.625 356.250 356.875 357.500 358.125 358.750 359.375 360.000 360.625 361.250 361.875 362.500 363.125 363.750 364.375 365.000 365.000 365.000 365.000 366.000 367.000 368.000 369.000 370.000 367.500 365.000 365.000 365.000 365.000 365.000 365.000 365.000 365.152 365.303 365.455 365.606 365.758 365.909 366.061 366.212 366.364 366.515 366.667 366.818 366.970 367.121 367.273 367.424 367.576 367.727 367.879 368.030 368.182 368.333 368.485 368.636 368.788 368.939 369.091 369.242 369.394 369.545 369.697 369.848 370.000 370.000 370.000 370.000 372.500 375.000 372.500 370.000 370.000 370.231 370.500 370.816 371.193 371.652 372.220 372.944 373.896 375.206 377.123 380.192 385.901 400.231
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
54 57 63 0 0 0 0 51 0 0 66 0 60 0 0 0 57 54 57 60 0 60 0 0 0 0 57 0 60 60 0 0 0 60 57 0 60 0 60 57 60 63 60 0 60 57 57 0 0 57 60 0 54 0 54 57 54 51 54 60 57 57 51 57 54 0 57 57 57 60 57 0 60 0 60 0 57 54 60 60 57 54 60 60 54 0 57 57 51
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
2.734375 -1.171875 -0.390625 -0.390625 2.734375 0.390625 -1.171875 -0.390625 -0.390625 -1.171875 -1.171875 -1.953125 -1.171875 -1.171875 -0.390625 -0.390625 -1.171875 -1.953125 -1.953125 -1.171875 -1.953125 -1.171875 -0.390625 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -0.390625 -0.390625 -0.390625 -1.171875 -0.390625 -0.390625 -1.171875 -1.171875 -0.390625 -1.171875 -0.390625 -1.171875 -1.171875 -1.171875 -1.953125 -1.171875 -1.171875 1.171875 -0.390625 -1.171875 -0.390625 -2.734375 -0.390625 -1.953125 -1.171875 -1.171875 -1.171875 -1.171875 -1.953125 0.390625 -1.171875 -2.734375 -1.171875 0.390625 -1.953125 -1.953125 -0.390625 -1.953125 0.390625 0.390625 -2.734375 -1.953125 -0.390625 0.390625 1.171875 1.171875 -0.390625 0.390625 0.390625 0.390625 1.171875 -1.953125 0.390625 1.171875 -1.171875 -0.390625 0.390625 -1.953125
</TraceValueList>
</Trace>
</TraceList>
<ProfileList Num="1">
<Profile  Algorithm="NH" AlgorithmVersion="4.33" Type="vertical" >
<Tabulated Num="99">
<AltitudeList Type="float" Units="km" Description="Altitude above station level" >
93.502 95.0 100.0 105.0 110.0 115.0 120.0 125.0 130.0 135.0 140.0 145.0 146.171 150.0 155.0 160.0 165.0 170.0 175.0 180.0 182.341 185.0 190.0 195.0 200.0 205.0 210.0 215.0 218.512 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 346.846 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.234 0.307 0.343 0.354 0.352 0.345 0.333 0.315 0.291 0.258 0.213 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.211 0.233 0.254 0.275 0.296 0.318 0.339 0.354 0.378 0.486 0.65 0.856 1.074 1.295 1.515 1.737 1.961 2.189 2.423 2.663 2.911 3.169 3.437 3.717 4.01 4.32 4.648 4.998 5.375 5.783 6.234 6.741 7.333 8.037 8.2 8.17 8.012 7.746 7.404 7.009 6.584 6.145 5.705 5.273 4.857 4.461 4.088 3.738 3.412 3.111 2.833 2.578 2.344 2.13 1.935 1.757 1.594 1.447 1.312 1.19 1.079 0.979 0.887 0.804 0.729 0.661 0.599 0.543 0.492 0.446 0.404 0.366 0.332 0.301 0.273 0.247 0.224 0.203

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="0.354" PeakHeight="110.0" Num="3" Error="0.0">
-18.791 2.435 -0.142
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="0.354" EndFrequency="8.2" PeakHeight="346.846" Num="5" zHalfNm="325.174" Error="2.36">
-102.81 -45.55 28.377 -8.607 0.256
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="108.512" Depth="0.154"/>
<TopsideChapman PeakHeight="346.846" PeakDensity="834243.2" PeakScaleHeight="15.863" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
