<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-04-02 -092 21:50:00.000"
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 0 0 0 0 0 0 0 0 1 0 "/>
<Comments>AR.5002.44 Confidence: 65% PACIFIC flags: 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" >
2026.04.02 (092) 21:50:00</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">
FF202609204022150009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="25" >
<URSI ID="00" Val="9.550" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.938" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="28.062" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="2.550" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="2.550" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="9.900" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="305.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="305.000" 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="9.300" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="416.706" 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="0.369" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="2.550" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="2.550" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="358.330" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="319.753" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="8.405" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="57.743" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="14.343" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="29.011" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="63.380" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.400" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="1">
<Trace Type="standard" Layer="F2" Polarization="O" Num="141">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
2.55 2.6 2.65 2.7 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 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 8.85 8.9 8.95 9.0 9.05 9.1 9.15 9.2 9.25 9.3 9.35 9.4 9.45 9.5 9.55
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
305.000 305.000 305.000 305.000 306.667 308.333 310.000 310.000 310.000 310.000 310.000 310.000 310.000 310.000 311.111 312.222 313.333 314.444 315.556 316.667 317.778 318.889 320.000 320.000 320.000 320.000 321.000 322.000 323.000 324.000 325.000 325.000 325.000 326.667 328.333 330.000 330.000 325.000 325.000 325.000 325.000 325.000 325.000 326.667 328.333 330.000 335.000 335.000 335.000 335.000 335.000 335.000 335.000 335.000 335.000 335.000 335.000 335.000 340.000 345.000 345.000 340.000 342.000 344.000 346.000 348.000 350.000 350.000 350.000 350.000 350.000 351.250 352.500 353.750 355.000 350.000 351.250 352.500 353.750 355.000 350.000 351.667 353.333 355.000 356.667 358.333 360.000 360.833 361.667 362.500 363.333 364.167 365.000 365.000 365.000 367.500 370.000 370.000 370.000 375.000 375.000 375.000 375.000 375.000 375.000 377.500 380.000 380.000 382.500 385.000 385.000 385.000 385.000 390.000 390.000 390.000 390.000 390.000 391.250 392.500 393.750 395.000 400.000 400.000 401.250 401.894 402.611 403.415 404.324 405.358 406.547 407.926 409.546 411.476 413.814 416.706 420.373 425.178 431.746 441.265 456.299
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
69 0 0 69 0 0 72 0 0 0 0 72 72 69 0 0 0 0 0 0 60 0 63 0 66 69 0 48 0 0 0 57 66 0 48 54 54 57 0 0 0 63 0 0 0 66 57 0 0 63 63 0 0 69 60 0 0 63 0 54 57 0 0 0 0 0 51 54 0 60 63 0 0 0 54 66 0 63 0 66 0 0 60 0 0 0 66 0 60 0 63 48 66 57 63 0 66 66 69 60 63 66 66 72 66 0 69 69 57 63 66 0 72 57 60 0 66 69 0 0 0 69 57 63 45 0 0 63 66 69 69 63 66 69 60 63 0 0 0 0 0
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
-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 -1.171875 -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 -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 -2.734375 -0.390625 -0.390625 -0.390625 -0.390625 -1.171875 -1.171875 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -1.171875 -0.390625 -0.390625 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -0.390625 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 2.734375 1.953125 -2.734375 -2.734375
</TraceValueList>
</Trace>
</TraceList>
<ProfileList Num="1">
<Profile  Algorithm="NH" AlgorithmVersion="4.33" Type="vertical" >
<Tabulated Num="139">
<AltitudeList Type="float" Units="km" Description="Altitude above station level" >
93.19 95.0 100.0 105.0 110.0 115.0 120.0 125.0 130.0 135.0 139.779 140.0 145.0 150.0 155.0 160.0 165.0 169.559 170.0 175.0 180.0 185.0 190.0 195.0 199.338 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 358.33 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.244 0.32 0.357 0.369 0.365 0.354 0.334 0.305 0.261 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.203 0.231 0.259 0.288 0.316 0.344 0.369 0.384 0.495 0.612 0.735 0.869 1.012 1.167 1.335 1.515 1.709 1.918 2.143 2.383 2.641 2.917 3.211 3.525 3.858 4.213 4.589 4.987 5.405 5.845 6.303 6.777 7.26 7.746 8.22 8.663 9.048 9.344 9.516 9.55 9.547 9.503 9.412 9.28 9.112 8.915 8.694 8.454 8.198 7.932 7.658 7.379 7.098 6.817 6.539 6.264 5.994 5.73 5.472 5.222 4.98 4.746 4.52 4.303 4.094 3.894 3.702 3.519 3.343 3.175 3.015 2.863 2.717 2.579 2.447 2.322 2.203 2.089 1.982 1.879 1.782 1.69 1.602 1.519 1.44 1.365 1.294 1.226 1.163 1.102 1.044 0.99 0.938 0.889 0.843 0.799 0.757 0.717 0.68 0.644 0.61 0.578 0.548 0.519 0.492 0.466 0.442 0.419 0.397 0.376 0.356 0.338 0.32 0.303 0.287 0.272 0.258 0.244 0.232 0.22 0.208

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="0.369" PeakHeight="110.0" Num="3" Error="0.0">
-19.304 2.66 -0.166
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="0.369" EndFrequency="9.55" PeakHeight="358.33" Num="5" zHalfNm="319.753" Error="1.37">
-142.361 -27.898 12.411 -1.361 0.217
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="89.338" Depth="0.169"/>
<TopsideChapman PeakHeight="358.33" PeakDensity="1131544.6" PeakScaleHeight="29.011" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
