<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-03-25 -084 01:50:00.000"
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, One of F2 cusps was derived from the other, Unidentified traces above foF2, Trace overlaps while constructing baseline</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" >
2026.03.25 (084) 01:50:00</StartTime>
<SolarTerrestrialData>
<GyroFrequency Val="0.63" Model="IGRF 3.0" Altitude="300"/>
<DipAngle Val="-11.18" 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">
FF202608403250150009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="24" >
<URSI ID="00" Val="7.850" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="3.329" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="26.136" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="4.350" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="4.350" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="8.250" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="285.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="285.000" 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="0.250" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="7.700" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="341.712" Name="h`(fMUF)" Units="km" QL="/" DL="/" />
<Modeled Name="foEp" Val="0.354" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="4.350" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="4.350" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="322.910" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="304.248" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="6.538" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="29.667" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="4.843" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="13.402" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="38.700" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.060" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="1">
<Trace Type="standard" Layer="F2" Polarization="O" Num="71">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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 7.4 7.45 7.5 7.55 7.6 7.65 7.7 7.75 7.8 7.85
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
285.000 290.000 295.000 305.000 310.000 315.000 320.000 345.000 355.000 357.500 360.000 375.000 385.000 382.857 380.714 378.571 376.429 374.286 372.143 370.000 367.857 365.714 363.571 361.429 359.286 357.143 355.000 352.857 350.714 348.571 346.429 344.286 342.143 340.000 337.857 335.714 333.571 331.429 329.286 327.143 325.000 325.000 325.000 325.000 330.000 335.000 336.364 337.727 339.091 340.455 341.818 343.182 344.545 345.909 347.273 348.636 350.000 355.000 353.333 351.667 350.000 348.333 346.667 335.000 335.982 337.280 339.072 341.712 345.982 354.072 375.253
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
66 0 66 0 0 57 63 51 51 0 54 51 54 54 0 0 0 51 0 48 0 48 0 0 0 54 54 0 0 57 0 0 0 0 57 0 0 0 0 0 63 0 63 66 0 57 0 60 57 57 0 54 0 54 0 0 54 51 0 0 0 0 0 48 54 54 51 51 54 57 60
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
0.390625 0.390625 0.390625 1.171875 1.171875 0.390625 0.390625 0.390625 -0.390625 0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 2.734375 1.171875 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -1.171875 -2.734375 -0.390625 0.390625 1.171875 -1.953125 -0.390625 1.171875 1.953125 1.953125 1.953125 -0.390625 1.171875 1.171875 1.171875 1.171875 1.953125 0.390625 1.953125 1.171875 1.171875 0.390625 0.390625 1.171875 1.171875 1.171875 0.390625 1.171875 -0.390625 -0.390625 1.953125 0.390625 1.171875 2.734375 1.171875 0.390625 -2.734375 2.734375 1.171875 2.734375 1.953125 -2.734375 0.390625 0.390625 0.390625 0.390625 0.390625 1.171875
</TraceValueList>
</Trace>
</TraceList>
<ProfileList Num="1">
<Profile  Algorithm="NH" AlgorithmVersion="4.33" Type="vertical" >
<Tabulated Num="87">
<AltitudeList Type="float" Units="km" Description="Altitude above station level" >
93.502 95.0 100.0 105.0 110.0 115.0 120.0 125.0 130.0 135.0 140.0 145.0 147.427 150.0 155.0 160.0 165.0 170.0 175.0 180.0 184.853 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 222.28 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 322.91 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.234 0.307 0.343 0.354 0.352 0.345 0.334 0.318 0.295 0.265 0.225 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.201 0.221 0.242 0.262 0.283 0.303 0.324 0.345 0.354 0.421 0.576 0.786 1.044 1.332 1.634 1.942 2.256 2.575 2.902 3.238 3.586 3.948 4.327 4.729 5.158 5.624 6.139 6.73 7.453 7.85 7.832 7.66 7.346 6.936 6.469 5.974 5.476 4.988 4.522 4.083 3.676 3.302 2.96 2.649 2.368 2.115 1.888 1.684 1.501 1.338 1.192 1.062 0.946 0.842 0.75 0.667 0.594 0.529 0.471 0.419 0.373 0.332 0.295 0.263 0.234 0.208

</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="7.85" PeakHeight="322.91" Num="5" zHalfNm="304.248" Error="4.186">
-81.603 -34.127 22.199 -8.56 1.461
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="112.28" Depth="0.154"/>
<TopsideChapman PeakHeight="322.91" PeakDensity="764547.1" PeakScaleHeight="13.402" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
