<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-02-21 -052 08:00:00.000"
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 22 1 0 0 0 0 0 0 0 1 0 "/>
<Comments>AR.5002.44 Confidence: 80% PACIFIC flags: Moderate F-spread, 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" >
2026.02.21 (052) 08:00:00</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">
FF202605202210800009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="28" >
<URSI ID="00" Val="6.900" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="3.423" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="23.616" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="2.300" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="30" Val="4.650" Name="foEs" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="3.000" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="7.300" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="235.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="235.000" Name="h`F2" Units="km" QL="/" DL="/" />
<URSI ID="34" Val="120.000" 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="0.050" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="6.350" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="290.000" Name="h`(fMUF)" Units="km" QL="/" DL="/" />
<Modeled Name="foEp" Val="0.354" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="3.000" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="3.000" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="276.486" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="237.652" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="2.643" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<Custom Name="fminEs" Val="2.300" Description="Minimum frequency of Es-layer" Units="MHz" />
<URSI ID="94" Val="54.795" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="7.144" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="29.654" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="44.650" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="4.240" Name="B1" QL="/" DL="/" />
<URSI ID="32" Val="3.000" Name="fbEs" Units="MHz" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="2">
<Trace Type="standard" Layer="F2" Polarization="O" Num="79">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
235.000 240.000 240.000 240.000 240.000 240.000 240.000 238.333 236.667 235.000 236.250 237.500 238.750 240.000 241.250 242.500 243.750 245.000 246.250 247.500 248.750 250.000 251.250 252.500 253.750 255.000 250.000 250.000 250.000 252.500 255.000 253.750 252.500 251.250 250.000 255.000 255.000 255.000 255.000 255.000 255.000 255.000 255.000 255.000 260.000 260.000 260.000 260.000 260.000 260.000 265.000 265.000 265.000 270.000 270.000 270.000 270.000 275.000 275.000 275.000 280.000 280.000 280.000 285.000 290.000 290.000 290.000 290.000 300.000 300.000 305.000 310.000 320.000 320.000 330.000 340.000 350.000 374.238 437.559
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
66 69 0 72 0 0 75 0 0 57 0 0 0 0 75 0 0 0 0 0 63 0 0 0 0 0 75 0 72 0 0 0 69 0 69 66 0 0 75 0 0 0 69 72 66 72 66 72 66 69 75 75 81 63 72 75 75 72 72 69 69 75 69 69 72 69 63 63 72 69 66 78 66 72 69 66 69 66 57
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
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
</TraceValueList>
</Trace>
<Trace Type="standard" Layer="Es" Polarization="O" Num="48">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
2.3 2.35 2.4 2.45 2.5 2.55 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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
120.000 120.000 120.000 120.000 120.000 120.000 123.333 126.667 130.000 130.000 130.000 130.000 130.000 130.000 130.000 130.000 130.000 130.000 130.000 130.000 130.000 130.000 130.000 130.000 127.500 125.000 127.500 130.000 132.500 135.000 130.000 130.000 130.000 130.000 130.000 130.000 130.000 130.000 130.000 130.000 130.000 130.000 130.000 130.000 130.000 130.000 130.000 130.000
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
69 0 66 0 66 66 0 0 66 0 0 60 54 0 0 57 72 66 63 72 72 66 75 69 0 60 78 0 0 57 72 69 66 0 0 51 0 51 0 69 57 66 66 63 63 0 0 0
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
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 -2.734375 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
</TraceValueList>
</Trace>
</TraceList>
<ProfileList Num="1">
<Profile  Algorithm="NH" AlgorithmVersion="4.33" Type="vertical" >
<Tabulated Num="118">
<AltitudeList Type="float" Units="km" Description="Altitude above station level" >
93.502 95.0 100.0 105.0 110.0 115.0 120.0 125.0 130.0 135.0 139.167 140.0 145.0 150.0 155.0 160.0 165.0 168.333 170.0 175.0 180.0 185.0 190.0 195.0 197.5 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 276.486 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.234 0.307 0.343 0.354 0.35 0.34 0.321 0.292 0.25 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.209 0.235 0.262 0.288 0.314 0.341 0.354 0.419 0.591 0.824 1.147 1.622 2.38 3.471 4.467 5.187 5.71 6.101 6.394 6.61 6.762 6.857 6.898 6.9 6.891 6.848 6.774 6.672 6.548 6.404 6.244 6.072 5.889 5.7 5.505 5.308 5.109 4.911 4.714 4.52 4.329 4.143 3.961 3.784 3.612 3.446 3.286 3.131 2.983 2.84 2.703 2.572 2.447 2.327 2.212 2.103 1.999 1.899 1.804 1.714 1.628 1.546 1.468 1.394 1.323 1.256 1.192 1.132 1.074 1.02 0.968 0.918 0.871 0.827 0.785 0.745 0.707 0.67 0.636 0.604 0.573 0.543 0.515 0.489 0.464 0.44 0.418 0.396 0.376 0.357 0.338 0.321 0.305 0.289 0.274 0.26 0.247 0.234 0.222 0.211

</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="6.9" PeakHeight="276.486" Num="5" zHalfNm="237.652" Error="1.059">
-94.444 26.125 -14.77 5.036 -0.933
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="87.5" Depth="0.154"/>
<TopsideChapman PeakHeight="276.486" PeakDensity="590694.8" PeakScaleHeight="29.654" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
