<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-02-25 -056 09:50:00.000"
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 11 0 0 0 0 0 0 0 0 1 0 "/>
<Comments>AR.5002.44 Confidence: 95% PACIFIC flags: Multiple candidates for F2x cusp</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" >
2026.02.25 (056) 09:50:00</StartTime>
<SolarTerrestrialData>
<GyroFrequency Val="0.63" Model="IGRF 3.0" Altitude="300"/>
<DipAngle Val="-11.15" 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">
FF202605602250950009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="28" >
<URSI ID="00" Val="7.950" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="3.451" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="27.439" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="2.150" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="30" Val="2.500" Name="foEs" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="2.600" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="8.300" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="145.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="145.000" Name="h`F2" Units="km" QL="/" DL="/" />
<URSI ID="34" Val="135.000" Name="h`Es" 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="0.100" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="7.450" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="295.000" Name="h`(fMUF)" Units="km" QL="/" DL="/" />
<Custom Name="dlt foF2" Val="0.000" Description="Adjustment to the scaled foF2 during profile inversion" Units="MHz" />
<Modeled Name="foEp" Val="1.945" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="2.600" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="2.600" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="254.242" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="210.158" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="5.827" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<Custom Name="fminEs" Val="2.150" Description="Minimum frequency of Es-layer" Units="MHz" />
<URSI ID="94" Val="62.679" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="12.276" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="35.749" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="52.280" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="3.520" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="2">
<Trace Type="standard" Layer="F2" Polarization="O" Num="108">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
2.6 2.65 2.7 2.75 2.8 2.85 2.9 2.95 3.0 3.05 3.1 3.15 3.2 3.25 3.3 3.35 3.4 3.45 3.5 3.55 3.6 3.65 3.7 3.75 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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
145.000 160.833 176.667 192.500 208.333 224.167 240.000 240.000 240.000 240.000 240.000 240.000 240.000 240.000 240.000 242.500 245.000 240.000 240.000 240.000 240.000 240.000 240.000 240.000 245.000 245.000 245.000 247.500 250.000 247.500 245.000 245.000 245.000 245.000 245.000 245.000 245.000 245.000 245.000 245.000 245.000 245.000 245.000 245.000 245.000 250.000 250.000 250.000 245.000 245.000 245.000 250.000 250.000 250.000 250.000 250.000 250.000 250.000 250.000 250.000 250.000 250.000 255.000 255.000 255.000 255.000 257.500 260.000 260.000 260.000 261.667 263.333 265.000 265.000 266.250 267.500 268.750 270.000 270.000 270.000 270.000 270.000 270.000 275.000 275.000 275.000 280.000 280.000 280.000 280.000 285.000 285.000 285.000 290.000 290.000 295.000 295.000 295.000 305.000 310.000 310.000 315.000 320.000 325.000 333.815 348.067 375.028 445.383
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
57 0 0 0 0 0 57 60 60 60 0 60 0 63 63 60 60 63 0 63 57 57 54 51 60 0 57 0 0 0 60 69 69 69 0 66 66 63 66 63 63 63 63 63 60 66 66 66 57 57 54 69 0 0 69 0 66 0 66 63 63 60 0 0 69 69 0 66 66 69 0 0 60 63 0 0 0 57 63 66 69 69 72 66 69 72 60 66 72 72 66 72 72 69 72 69 72 72 66 63 72 72 72 69 69 69 63 45
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
0.390625 -2.734375 0.390625 2.734375 1.953125 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 1.171875
</TraceValueList>
</Trace>
<Trace Type="standard" Layer="Es" Polarization="O" Num="8">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
2.15 2.2 2.25 2.3 2.35 2.4 2.45 2.5
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
125.000 125.000 125.000 128.750 132.500 136.250 140.000 135.000
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
48 60 57 0 0 0 60 63
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
0.390625 0.390625 -0.390625 2.734375 1.953125 1.953125 0.390625 -0.390625
</TraceValueList>
</Trace>
</TraceList>
<ProfileList Num="1">
<Profile  Algorithm="NH" AlgorithmVersion="4.33" Type="vertical" >
<Tabulated Num="134">
<AltitudeList Type="float" Units="km" Description="Altitude above station level" >
89.777 90.0 95.0 100.0 105.0 110.0 115.0 118.167 120.0 125.0 126.333 130.0 134.5 135.0 140.0 145.0 150.0 155.0 160.0 165.0 170.0 175.0 180.0 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 254.242 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.219 1.303 1.684 1.882 1.945 1.898 1.817 1.817 1.817 1.817 1.874 1.945 1.979 2.225 2.416 2.593 2.765 2.938 3.116 3.302 3.499 3.71 3.939 4.193 4.477 4.801 5.176 5.607 6.085 6.566 6.988 7.323 7.573 7.751 7.868 7.933 7.95 7.95 7.931 7.884 7.813 7.721 7.609 7.48 7.338 7.183 7.018 6.846 6.667 6.483 6.296 6.108 5.918 5.728 5.539 5.352 5.167 4.985 4.807 4.631 4.46 4.293 4.13 3.972 3.819 3.669 3.525 3.385 3.25 3.12 2.994 2.873 2.756 2.643 2.534 2.43 2.329 2.233 2.14 2.051 1.965 1.883 1.804 1.728 1.656 1.586 1.519 1.455 1.393 1.334 1.278 1.224 1.172 1.122 1.074 1.029 0.985 0.943 0.903 0.865 0.828 0.792 0.759 0.726 0.695 0.666 0.637 0.61 0.584 0.559 0.535 0.512 0.491 0.47 0.45 0.43 0.412 0.394 0.378 0.361 0.346 0.331 0.317 0.303 0.29 0.278 0.266 0.255 0.244 0.233 0.223 0.214 0.205

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="1.945" PeakHeight="110.0" Num="3" Error="0.0">
-28.981 11.001 -2.243
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="1.945" EndFrequency="7.95" PeakHeight="254.242" Num="5" zHalfNm="210.158" Error="6.64">
-105.928 -12.161 -8.122 6.795 -0.326
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="24.5" Depth="0.128"/>
<TopsideChapman PeakHeight="254.242" PeakDensity="784150.1" PeakScaleHeight="35.749" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
