<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-04-04 -094 22:30:00.000"
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 33 2 0 0 0 0 0 0 0 1 0 "/>
<Comments>AR.5002.44 Confidence: 65% PACIFIC flags: Severe F-spread, F2x cusp not found, Multiple candidates for F2o cusp, 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" >
2026.04.04 (094) 22:30:00</StartTime>
<SolarTerrestrialData>
<GyroFrequency Val="0.63" Model="IGRF 3.0" Altitude="300"/>
<DipAngle Val="-11.19" 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">
FF202609404042230009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="25" >
<URSI ID="00" Val="8.800" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.953" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="25.988" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="6.350" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="6.350" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="9.100" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="375.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="375.000" 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="0.300" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="8.550" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="410.000" 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="6.900" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="6.900" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="353.824" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="310.821" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="8.038" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="63.672" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="13.233" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="31.978" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="65.730" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.740" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="1">
<Trace Type="standard" Layer="F2" Polarization="O" Num="50">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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 7.9 7.95 8.0 8.05 8.1 8.15 8.2 8.25 8.3 8.35 8.4 8.45 8.5 8.55 8.6 8.65 8.7 8.75 8.8
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
375.714 376.429 377.143 377.857 378.571 379.286 380.000 380.000 380.000 380.000 377.500 375.000 380.000 379.583 379.167 378.750 378.333 377.917 377.500 377.083 376.667 376.250 375.833 375.417 375.000 380.000 375.000 375.000 375.000 375.000 375.000 377.500 380.000 382.500 385.000 388.333 391.667 395.000 398.333 401.667 405.000 405.000 405.000 407.500 410.000 413.488 418.502 426.320 440.210 471.741
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
54 0 0 0 0 51 51 0 51 0 54 0 51 48 0 48 0 0 0 0 0 0 0 48 0 54 54 57 54 54 57 51 0 48 51 51 0 0 0 48 45 48 48 51 0 51 48 0 51 0
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
0.390625 0.390625 -1.171875 2.734375 -0.390625 1.953125 1.171875 0.390625 0.390625 2.734375 0.390625 1.171875 -1.171875 0.390625 -0.390625 2.734375 1.171875 1.953125 -0.390625 -0.390625 -2.734375 -1.171875 1.171875 1.953125 1.953125 0.390625 1.171875 1.171875 1.171875 1.171875 1.171875 0.390625 -0.390625 0.390625 1.171875 -0.390625 0.390625 -0.390625 0.390625 1.953125 -1.953125 -0.390625 -0.390625 0.390625 -2.734375 -0.390625 -0.390625 1.171875 0.390625 -1.953125
</TraceValueList>
</Trace>
</TraceList>
<ProfileList Num="1">
<Profile  Algorithm="NH" AlgorithmVersion="4.33" Type="vertical" >
<Tabulated Num="145">
<AltitudeList Type="float" Units="km" Description="Altitude above station level" >
93.502 95.0 100.0 105.0 110.0 115.0 120.0 125.0 130.0 135.0 140.0 142.834 145.0 150.0 155.0 160.0 165.0 170.0 175.0 175.668 180.0 185.0 190.0 195.0 200.0 205.0 208.502 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 353.824 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0
</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 0.328 0.306 0.275 0.232 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.22 0.244 0.267 0.291 0.314 0.338 0.354 0.384 0.484 0.596 0.724 0.875 1.052 1.258 1.493 1.756 2.044 2.353 2.682 3.026 3.384 3.754 4.134 4.524 4.922 5.328 5.74 6.154 6.569 6.98 7.381 7.761 8.108 8.405 8.632 8.768 8.8 8.799 8.769 8.703 8.604 8.476 8.324 8.152 7.962 7.758 7.544 7.321 7.092 6.86 6.625 6.39 6.157 5.925 5.696 5.472 5.252 5.037 4.828 4.625 4.427 4.237 4.052 3.874 3.703 3.538 3.379 3.226 3.08 2.94 2.805 2.676 2.553 2.435 2.322 2.214 2.11 2.012 1.918 1.828 1.742 1.66 1.582 1.507 1.436 1.368 1.303 1.242 1.183 1.127 1.073 1.022 0.974 0.928 0.884 0.842 0.802 0.764 0.727 0.693 0.66 0.628 0.598 0.57 0.543 0.517 0.492 0.469 0.446 0.425 0.405 0.386 0.367 0.35 0.333 0.317 0.302 0.288 0.274 0.261 0.248 0.237 0.225 0.215 0.204

</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="8.8" PeakHeight="353.824" Num="5" zHalfNm="310.821" Error="2.297">
-139.261 -12.025 8.797 -4.303 1.47
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="98.502" Depth="0.154"/>
<TopsideChapman PeakHeight="353.824" PeakDensity="960794.06" PeakScaleHeight="31.978" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
