<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-02-28 -059 08:30:00.000"
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 0 0 0 0 0 0 0 0 1 0 "/>
<Comments>AR.5002.44 Confidence: 70% PACIFIC flags: F2x cusp not found, One of F2 cusps was derived from the other</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" >
2026.02.28 (059) 08:30:00</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">
FF202605902280830009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="24" >
<URSI ID="00" Val="2.550" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="3.500" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="8.926" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="1.900" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="1.900" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="2.900" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="255.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="255.000" 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="0.100" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="2.400" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="291.059" Name="h`(fMUF)" Units="km" QL="/" DL="/" />
<Modeled Name="foEp" Val="0.483" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="1.900" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="1.900" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="262.556" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="227.308" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="3.368" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="50.361" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="0.943" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="27.541" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="45.160" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="3.300" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="1">
<Trace Type="standard" Layer="F2" Polarization="O" Num="14">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
1.9 1.95 2.0 2.05 2.1 2.15 2.2 2.25 2.3 2.35 2.4 2.45 2.5 2.55
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
255.000 255.000 256.748 258.761 261.105 263.867 267.171 271.194 276.199 282.596 291.059 302.782 320.096 348.258
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
75 81 0 81 75 75 0 66 54 60 63 0 0 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
</TraceValueList>
</Trace>
</TraceList>
<ProfileList Num="1">
<Profile  Algorithm="NH" AlgorithmVersion="4.33" Type="vertical" >
<Tabulated Num="93">
<AltitudeList Type="float" Units="km" Description="Altitude above station level" >
91.779 95.0 100.0 105.0 110.0 115.0 120.0 125.0 130.0 135.0 138.159 140.0 145.0 150.0 155.0 160.0 165.0 166.318 170.0 175.0 180.0 185.0 190.0 194.477 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 262.556 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.319 0.418 0.468 0.483 0.477 0.457 0.422 0.369 0.283 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.237 0.287 0.338 0.388 0.438 0.483 0.494 0.636 0.81 0.996 1.199 1.429 1.684 1.934 2.141 2.294 2.403 2.478 2.525 2.547 2.55 2.548 2.533 2.504 2.464 2.413 2.355 2.29 2.22 2.146 2.07 1.992 1.913 1.834 1.755 1.678 1.602 1.528 1.455 1.385 1.317 1.252 1.189 1.129 1.071 1.016 0.963 0.913 0.865 0.819 0.775 0.734 0.695 0.657 0.622 0.588 0.556 0.526 0.498 0.471 0.445 0.421 0.398 0.376 0.355 0.336 0.317 0.3 0.284 0.268 0.253 0.239 0.226 0.214 0.202

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="0.483" PeakHeight="110.0" Num="3" Error="0.0">
-22.013 4.16 -0.368
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="0.483" EndFrequency="2.55" PeakHeight="262.556" Num="5" zHalfNm="227.308" Error="0.898">
-75.797 12.167 -6.478 2.974 -0.945
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="84.477" Depth="0.283"/>
<TopsideChapman PeakHeight="262.556" PeakDensity="80676.18" PeakScaleHeight="27.541" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
