<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-03-20 -079 22:50:00.000"
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" >
2026.03.20 (079) 22:50:00</StartTime>
<SolarTerrestrialData>
<GyroFrequency Val="0.63" Model="IGRF 3.0" Altitude="300"/>
<DipAngle Val="-11.17" 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">
FF202607903202250009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="24" >
<URSI ID="00" Val="6.900" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.851" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="19.671" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="2.750" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="2.750" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="7.250" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="360.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="360.000" 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="6.800" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="445.000" Name="h`(fMUF)" Units="km" QL="/" DL="/" />
<Modeled Name="foEp" Val="0.354" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="2.750" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="2.750" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="391.016" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="356.221" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="8.181" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="54.311" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="7.000" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="25.501" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="69.340" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.000" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="1">
<Trace Type="standard" Layer="F2" Polarization="O" Num="84">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
2.75 2.8 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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
360.000 365.000 366.000 367.000 368.000 369.000 370.000 368.333 366.667 365.000 363.333 361.667 360.000 367.500 375.000 372.500 370.000 372.500 375.000 377.500 380.000 382.500 385.000 387.500 390.000 392.500 395.000 397.500 400.000 400.000 400.000 400.000 405.000 405.000 420.000 420.000 420.000 420.000 420.000 420.000 415.000 415.000 415.000 415.000 415.000 417.500 420.000 420.000 420.000 420.000 425.000 425.000 425.000 425.000 425.000 426.667 428.333 430.000 432.500 435.000 445.000 455.000 453.846 452.692 451.538 450.385 449.231 448.077 446.923 445.769 444.615 443.462 442.308 441.154 440.000 438.333 436.667 435.000 436.298 438.092 440.731 445.000 453.079 474.186
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
60 0 0 0 51 0 60 0 0 0 0 0 60 0 0 0 57 57 0 57 0 57 54 0 0 0 0 0 57 60 60 57 57 60 51 0 0 54 0 57 54 0 57 54 54 0 54 0 0 54 60 54 0 0 51 0 0 51 54 54 57 54 0 0 0 0 0 0 0 0 0 0 0 0 57 0 0 57 51 54 0 54 51 0
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
-0.390625 0.390625 -0.390625 0.390625 -1.171875 -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 -1.171875 -1.171875 -0.390625 -0.390625 0.390625 -1.171875 -0.390625 0.390625 -1.171875 -1.171875 -1.171875 0.390625 0.390625 0.390625 -0.390625 -0.390625 0.390625 -1.171875 -1.171875 0.390625 0.390625 0.390625 0.390625 2.734375 0.390625 -0.390625 0.390625 -1.171875 -1.171875 -1.953125 0.390625 -1.171875 0.390625 0.390625 0.390625 0.390625 -0.390625 -1.171875 -1.171875 -0.390625 0.390625 0.390625 0.390625 -0.390625 1.953125 -0.390625 1.171875 -0.390625 -0.390625 1.953125 0.390625 -0.390625 -0.390625 0.390625 -2.734375 -0.390625 -0.390625 0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -2.734375 -0.390625 -0.390625 -1.171875
</TraceValueList>
</Trace>
</TraceList>
<ProfileList Num="1">
<Profile  Algorithm="NH" AlgorithmVersion="4.33" Type="vertical" >
<Tabulated Num="131">
<AltitudeList Type="float" Units="km" Description="Altitude above station level" >
93.502 95.0 100.0 105.0 110.0 115.0 120.0 125.0 130.0 135.0 140.0 143.574 145.0 150.0 155.0 160.0 165.0 170.0 175.0 177.149 180.0 185.0 190.0 195.0 200.0 205.0 210.0 210.723 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 391.016 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.234 0.307 0.343 0.354 0.351 0.343 0.329 0.308 0.279 0.239 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.213 0.236 0.259 0.282 0.305 0.328 0.351 0.354 0.425 0.516 0.615 0.721 0.832 0.949 1.069 1.194 1.321 1.453 1.587 1.725 1.866 2.011 2.159 2.312 2.469 2.63 2.795 2.966 3.142 3.324 3.513 3.708 3.911 4.123 4.343 4.575 4.818 5.074 5.347 5.638 5.95 6.285 6.633 6.89 6.9 6.884 6.823 6.721 6.586 6.423 6.238 6.036 5.821 5.598 5.37 5.139 4.908 4.68 4.455 4.235 4.021 3.813 3.613 3.421 3.236 3.059 2.89 2.729 2.576 2.431 2.293 2.162 2.038 1.92 1.809 1.704 1.605 1.511 1.423 1.34 1.261 1.187 1.117 1.051 0.989 0.931 0.876 0.824 0.775 0.73 0.686 0.646 0.607 0.571 0.538 0.506 0.476 0.447 0.421 0.396 0.372 0.35 0.329 0.31 0.292 0.274 0.258 0.243 0.228 0.215 0.202

</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="6.9" PeakHeight="391.016" Num="5" zHalfNm="356.221" Error="2.252">
-147.123 -58.736 33.522 -9.127 1.171
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="100.723" Depth="0.154"/>
<TopsideChapman PeakHeight="391.016" PeakDensity="590694.8" PeakScaleHeight="25.501" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
