<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-02-28 -059 08:10:00.000"
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 0 0 0 0 0 0 0 0 1 0 "/>
<Comments>AR.5002.44 Confidence: 45% 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) 08:10:00</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">
FF202605902280810009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="29" >
<URSI ID="00" Val="2.850" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="3.594" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="10.243" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="1.900" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="30" Val="2.800" Name="foEs" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="2.200" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="3.200" 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="34" Val="105.000" 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="2.700" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="281.762" 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="0.354" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="2.200" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="2.200" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="257.191" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="232.413" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="2.853" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<Custom Name="fminEs" Val="1.900" Description="Minimum frequency of Es-layer" Units="MHz" />
<URSI ID="94" Val="35.367" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="0.815" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="18.991" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="33.460" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="2.650" Name="B1" QL="/" DL="/" />
<URSI ID="32" Val="2.200" Name="fbEs" Units="MHz" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="2">
<Trace Type="standard" Layer="F2" Polarization="O" Num="14">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
2.2 2.25 2.3 2.35 2.4 2.45 2.5 2.55 2.6 2.65 2.7 2.75 2.8 2.85
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
255.000 255.000 255.000 257.500 260.000 265.000 267.043 269.528 272.617 276.558 281.762 288.951 299.528 316.631
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
66 57 60 0 57 63 60 54 57 0 0 57 63 60
</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>
<Trace Type="standard" Layer="Es" Polarization="O" Num="19">
<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 2.6 2.65 2.7 2.75 2.8
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
115.000 110.000 109.286 108.571 107.857 107.143 106.429 105.714 105.000 105.000 105.000 105.000 107.500 110.000 111.000 112.000 113.000 114.000 115.000
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
0 75 0 0 0 0 0 0 63 0 0 0 0 57 0 0 0 0 51
</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
</TraceValueList>
</Trace>
</TraceList>
<ProfileList Num="1">
<Profile  Algorithm="NH" AlgorithmVersion="4.33" Type="vertical" >
<Tabulated Num="76">
<AltitudeList Type="float" Units="km" Description="Altitude above station level" >
93.502 95.0 100.0 105.0 110.0 115.0 120.0 125.0 130.0 135.0 140.0 140.48 145.0 150.0 155.0 160.0 165.0 170.0 170.961 175.0 180.0 185.0 190.0 195.0 200.0 201.441 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 257.191 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.234 0.307 0.343 0.354 0.351 0.341 0.324 0.298 0.261 0.206 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.22 0.246 0.271 0.296 0.321 0.347 0.354 0.462 0.654 0.884 1.158 1.483 1.844 2.187 2.464 2.662 2.786 2.844 2.85 2.844 2.807 2.742 2.654 2.55 2.434 2.311 2.184 2.056 1.929 1.805 1.684 1.569 1.459 1.355 1.257 1.164 1.077 0.997 0.921 0.851 0.786 0.725 0.669 0.617 0.569 0.525 0.484 0.446 0.411 0.379 0.349 0.322 0.296 0.273 0.252 0.232 0.213

</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="2.85" PeakHeight="257.191" Num="5" zHalfNm="232.413" Error="0.545">
-59.14 5.48 -3.178 1.526 -0.438
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="91.441" Depth="0.154"/>
<TopsideChapman PeakHeight="257.191" PeakDensity="100775.44" PeakScaleHeight="18.991" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
