<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-02-25 -056 00:50:00.000"
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 44 1 0 0 0 0 0 0 0 1 0 "/>
<Comments>AR.5002.44 Confidence: 40% PACIFIC flags: Moderate F-spread, Multiple candidates for F2x cusp, Multiple candidates for F2o cusp, F2 cusps do not match, 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" >
2026.02.25 (056) 00:50:00</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">
FF202605602250050009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="24" >
<URSI ID="00" Val="7.150" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="3.283" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="23.475" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="2.950" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="2.950" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="7.250" 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="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="0.400" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="6.250" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="285.000" Name="h`(fMUF)" Units="km" QL="/" DL="/" />
<Modeled Name="foEp" Val="0.354" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="3.300" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="3.300" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="292.098" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="247.908" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="6.335" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="62.630" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="8.707" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="33.485" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="52.000" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="3.870" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="1">
<Trace Type="standard" Layer="F2" Polarization="O" Num="85">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
250.000 247.500 245.000 245.000 245.000 245.000 245.000 235.000 235.000 240.000 242.500 245.000 240.000 240.000 250.000 255.000 255.000 255.000 260.000 260.000 260.000 255.000 255.000 257.500 260.000 260.000 260.000 260.000 262.500 265.000 260.000 260.000 260.000 265.000 270.000 265.000 265.000 265.000 265.000 267.500 270.000 265.000 267.500 270.000 270.000 270.000 280.000 280.000 277.500 275.000 275.000 275.000 275.000 272.500 270.000 271.667 273.333 275.000 272.500 270.000 272.500 275.000 275.000 285.000 285.000 285.000 285.000 295.000 300.000 305.000 310.000 315.000 322.500 330.000 355.000 345.000 352.500 360.000 345.000 350.000 355.000 365.000 385.000 390.000 412.758
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
60 0 60 63 66 0 66 60 0 0 63 69 63 0 63 69 66 60 57 0 57 60 0 0 60 69 69 66 0 63 66 69 72 69 60 66 66 63 69 63 63 66 0 63 0 72 63 63 60 66 69 72 66 63 54 0 0 66 0 57 0 60 63 63 60 0 63 57 0 0 63 60 0 57 51 54 0 57 66 0 57 48 54 57 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 1.171875 -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 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 0.390625 0.390625 0.390625 -1.953125 -0.390625 0.390625 0.390625 -0.390625 1.953125 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 1.171875 -0.390625 -1.953125 -0.390625 1.953125 -0.390625 1.171875 1.171875 0.390625 -0.390625 1.171875 1.953125 -0.390625
</TraceValueList>
</Trace>
</TraceList>
<ProfileList Num="1">
<Profile  Algorithm="NH" AlgorithmVersion="4.33" Type="vertical" >
<Tabulated Num="132">
<AltitudeList Type="float" Units="km" Description="Altitude above station level" >
93.502 95.0 100.0 105.0 110.0 115.0 120.0 125.0 130.0 135.0 139.167 140.0 145.0 150.0 155.0 160.0 165.0 168.333 170.0 175.0 180.0 185.0 190.0 195.0 197.5 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 292.098 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0
</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 0.414 0.546 0.708 0.918 1.209 1.637 2.282 3.135 3.987 4.703 5.284 5.754 6.136 6.445 6.69 6.878 7.015 7.104 7.146 7.15 7.145 7.113 7.055 6.973 6.871 6.751 6.616 6.468 6.311 6.145 5.972 5.795 5.615 5.434 5.252 5.07 4.889 4.711 4.535 4.362 4.193 4.028 3.868 3.711 3.56 3.413 3.271 3.133 3.0 2.873 2.749 2.631 2.517 2.407 2.302 2.201 2.104 2.011 1.922 1.836 1.755 1.676 1.601 1.53 1.461 1.395 1.333 1.273 1.215 1.16 1.108 1.058 1.01 0.964 0.921 0.879 0.839 0.801 0.765 0.73 0.697 0.665 0.635 0.606 0.578 0.552 0.527 0.503 0.48 0.458 0.437 0.417 0.398 0.38 0.363 0.346 0.331 0.316 0.301 0.287 0.274 0.262 0.25 0.239 0.228 0.217 0.207

</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="7.15" PeakHeight="292.098" Num="5" zHalfNm="247.908" Error="2.202">
-109.709 25.691 -14.299 3.833 -0.114
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="87.5" Depth="0.154"/>
<TopsideChapman PeakHeight="292.098" PeakDensity="634274.2" PeakScaleHeight="33.485" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
