<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-02-26 -057 07:50:00.000"
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 33 1 0 0 0 0 0 0 0 1 0 "/>
<Comments>AR.5002.44 Confidence: 60% PACIFIC flags: Moderate F-spread, Multiple candidates for F2x cusp, Multiple candidates for F2o cusp, One of F2 cusps was derived from the other, 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" >
2026.02.26 (057) 07:50:00</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">
FF202605702260750009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="24" >
<URSI ID="00" Val="7.350" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="3.540" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="26.018" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="2.850" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="2.850" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="8.350" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="240.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="240.000" 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="0.650" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="7.200" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="307.282" Name="h`(fMUF)" Units="km" QL="/" DL="/" />
<Modeled Name="foEp" Val="0.354" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="2.900" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="2.900" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="272.160" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="250.426" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="2.470" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="31.834" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="4.724" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="16.481" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="32.710" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.810" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="1">
<Trace Type="standard" Layer="F2" Polarization="O" Num="91">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
245.000 240.000 240.000 242.500 245.000 247.500 250.000 255.000 255.000 255.000 260.000 265.000 275.000 274.474 273.947 273.421 272.895 272.368 271.842 271.316 270.789 270.263 269.737 269.211 268.684 268.158 267.632 267.105 266.579 266.053 265.526 265.000 264.474 263.947 263.421 262.895 262.368 261.842 261.316 260.789 260.263 259.737 259.211 258.684 258.158 257.632 257.105 256.579 256.053 255.526 255.000 255.000 256.250 257.500 258.750 260.000 265.000 265.000 265.000 267.500 270.000 270.000 270.000 275.000 275.000 275.000 275.000 280.000 280.000 280.000 285.000 287.500 290.000 290.000 292.500 295.000 297.500 300.000 298.750 299.079 299.466 299.928 300.491 301.191 302.083 303.261 304.888 307.282 311.151 318.467 337.534
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
69 0 63 0 66 60 63 0 63 63 66 63 51 57 60 57 63 0 0 0 0 0 0 0 0 51 0 60 0 0 0 0 0 0 0 0 0 57 0 0 60 0 0 0 60 63 66 0 0 0 0 63 0 0 63 72 69 0 72 69 69 72 72 72 69 72 72 63 69 63 66 66 69 63 60 63 66 60 57 63 69 72 72 66 69 66 63 72 66 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 -2.734375 0.390625 0.390625 0.390625 1.953125 0.390625 0.390625 0.390625 0.390625 0.390625 1.171875 1.171875 1.171875 -0.390625 0.390625 1.171875 0.390625 1.171875 1.171875 1.171875 1.171875 -0.390625 0.390625 0.390625 1.171875 1.171875 1.171875 -0.390625 0.390625 0.390625 1.171875 0.390625 1.171875 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 0.390625 0.390625
</TraceValueList>
</Trace>
</TraceList>
<ProfileList Num="1">
<Profile  Algorithm="NH" AlgorithmVersion="4.33" Type="vertical" >
<Tabulated Num="84">
<AltitudeList Type="float" Units="km" Description="Altitude above station level" >
93.502 95.0 100.0 105.0 110.0 115.0 120.0 125.0 130.0 135.0 140.0 140.333 145.0 150.0 155.0 160.0 165.0 170.0 170.667 175.0 180.0 185.0 190.0 195.0 200.0 201.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 272.16 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0
</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 0.323 0.297 0.26 0.205 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.222 0.247 0.273 0.298 0.324 0.349 0.354 0.481 0.734 1.059 1.434 1.865 2.361 2.936 3.596 4.337 5.129 5.908 6.585 7.076 7.325 7.35 7.329 7.204 6.987 6.701 6.368 6.007 5.63 5.25 4.874 4.509 4.159 3.828 3.515 3.223 2.951 2.698 2.465 2.251 2.054 1.873 1.707 1.555 1.416 1.29 1.174 1.069 0.973 0.886 0.806 0.733 0.667 0.607 0.552 0.502 0.457 0.416 0.378 0.344 0.313 0.285 0.259 0.235 0.214

</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="7.35" PeakHeight="272.16" Num="5" zHalfNm="250.426" Error="2.248">
-68.488 -3.99 1.559 0.422 -0.663
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="91.0" Depth="0.154"/>
<TopsideChapman PeakHeight="272.16" PeakDensity="670254.3" PeakScaleHeight="16.481" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
