<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-04-01 -091 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 22 0 0 0 0 0 0 0 0 1 0 "/>
<Comments>AR.5002.44 Confidence: 70% PACIFIC flags: F2 cusps do not match</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" >
2026.04.01 (091) 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">
FF202609104012150009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="25" >
<URSI ID="00" Val="10.400" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.508" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="26.087" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="2.700" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="2.700" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="9.600" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="335.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="335.000" 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="10.050" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="530.000" 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="0.371" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="2.700" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="2.700" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="429.270" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="366.990" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="8.405" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="92.809" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="26.945" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="46.360" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="97.700" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.590" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="1">
<Trace Type="standard" Layer="F2" Polarization="O" Num="155">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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 9.6 9.65 9.7 9.75 9.8 9.85 9.9 9.95 10.0 10.05 10.1 10.15 10.2 10.25 10.3 10.35 10.4
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
335.000 335.000 340.000 340.000 340.000 340.000 340.000 340.000 340.000 340.000 340.000 345.000 345.714 346.429 347.143 347.857 348.571 349.286 350.000 350.000 350.000 350.000 350.000 351.429 352.857 354.286 355.714 357.143 358.571 360.000 361.250 362.500 363.750 365.000 365.000 365.000 365.000 365.000 365.000 365.000 367.500 370.000 371.000 372.000 373.000 374.000 375.000 375.000 376.250 377.500 378.750 380.000 380.000 380.000 380.000 380.000 380.000 380.000 380.000 380.000 380.000 385.000 390.000 390.000 390.000 390.000 390.000 395.000 395.000 395.000 395.000 395.000 397.500 400.000 400.000 400.000 400.000 400.000 405.000 406.250 407.500 408.750 410.000 410.000 415.000 415.000 415.000 415.000 415.000 420.000 420.000 420.000 422.500 425.000 425.000 425.000 425.000 430.000 430.000 430.000 435.000 435.000 440.000 440.000 440.000 440.000 440.000 445.000 445.000 450.000 450.000 450.000 455.000 455.000 455.000 460.000 460.000 462.500 465.000 465.000 465.000 470.000 470.000 475.000 475.000 480.000 480.000 485.000 485.000 485.000 490.000 495.000 495.000 495.000 500.000 502.500 505.000 510.000 510.000 511.667 513.333 515.000 520.000 522.500 525.000 527.500 530.000 530.000 535.000 540.000 544.251 548.994 554.319 560.339 567.203
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
57 63 60 0 0 0 0 0 0 66 63 66 51 0 0 0 0 0 66 51 63 63 63 0 0 0 0 0 0 57 0 0 0 54 0 57 60 0 63 66 0 57 0 0 0 0 51 57 0 0 0 51 57 0 63 66 51 54 0 0 0 66 54 60 66 0 69 54 57 0 60 63 0 57 0 66 0 69 60 0 48 0 60 60 45 0 60 66 66 57 63 63 0 60 63 66 69 66 66 66 60 63 51 57 66 69 69 66 66 60 63 66 60 63 66 60 63 0 60 63 63 63 60 63 63 60 60 54 57 60 57 51 57 60 57 0 57 51 57 0 0 57 57 0 0 0 51 48 48 0 0 48 45 0 0
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
1.171875 -0.390625 -0.390625 -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 -0.390625 -0.390625 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.953125 1.953125 -1.171875 -1.171875 1.953125 2.734375 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -0.390625 -0.390625 -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 -1.953125 -1.171875 -1.171875 -1.953125 -1.171875 -1.953125 -1.171875 -1.953125 -1.171875 -1.953125 -1.953125 -1.953125 -1.171875 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 1.171875 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 0.390625 -1.953125 -1.953125 -1.953125 -2.734375 -2.734375 -2.734375 -2.734375 -2.734375 -2.734375 -2.734375 -2.734375 -2.734375 -2.734375 -2.734375 -2.734375 -2.734375 -2.734375 1.953125 -2.734375 -2.734375 -2.734375 -1.953125 2.734375 -2.734375 -2.734375 -2.734375 1.953125 0.390625 -2.734375 -2.734375 0.390625 0.390625 -2.734375 -2.734375 -2.734375 -1.953125 1.171875
</TraceValueList>
</Trace>
</TraceList>
<ProfileList Num="1">
<Profile  Algorithm="NH" AlgorithmVersion="4.33" Type="vertical" >
<Tabulated Num="187">
<AltitudeList Type="float" Units="km" Description="Altitude above station level" >
93.154 95.0 100.0 105.0 110.0 115.0 120.0 125.0 130.0 135.0 139.743 140.0 145.0 150.0 155.0 160.0 165.0 169.487 170.0 175.0 180.0 185.0 190.0 195.0 199.23 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 429.27 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 1000.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.245 0.321 0.359 0.371 0.367 0.356 0.336 0.306 0.262 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.203 0.232 0.26 0.289 0.318 0.347 0.371 0.387 0.473 0.552 0.633 0.718 0.81 0.909 1.017 1.134 1.261 1.4 1.55 1.712 1.886 2.071 2.267 2.474 2.692 2.919 3.156 3.401 3.655 3.917 4.187 4.463 4.747 5.037 5.334 5.636 5.944 6.258 6.576 6.898 7.224 7.551 7.88 8.207 8.531 8.848 9.155 9.445 9.712 9.947 10.143 10.289 10.376 10.4 10.4 10.385 10.348 10.291 10.216 10.124 10.017 9.896 9.762 9.618 9.464 9.302 9.133 8.959 8.779 8.595 8.408 8.22 8.029 7.838 7.646 7.455 7.265 7.076 6.888 6.703 6.519 6.339 6.161 5.986 5.814 5.645 5.48 5.318 5.16 5.005 4.854 4.707 4.563 4.423 4.286 4.153 4.023 3.898 3.775 3.656 3.54 3.428 3.319 3.213 3.11 3.01 2.914 2.82 2.729 2.641 2.555 2.472 2.392 2.314 2.239 2.166 2.095 2.027 1.961 1.896 1.834 1.774 1.716 1.66 1.605 1.552 1.501 1.452 1.404 1.358 1.313 1.27 1.228 1.188 1.148 1.11 1.074 1.038 1.004 0.971 0.939 0.908 0.878 0.849 0.821 0.794 0.767 0.742 0.717 0.694 0.671 0.649 0.627 0.606 0.586 0.567 0.548 0.53 0.512 0.495 0.479 0.463 0.448 0.433 0.419 0.405 0.391 0.378 0.366

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="0.371" PeakHeight="110.0" Num="3" Error="0.0">
-19.367 2.691 -0.17
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="0.371" EndFrequency="10.4" PeakHeight="429.27" Num="5" zHalfNm="366.99" Error="4.577">
-215.253 -28.295 16.645 -5.781 2.644
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="89.23" Depth="0.171"/>
<TopsideChapman PeakHeight="429.27" PeakDensity="1341935.5" PeakScaleHeight="46.36" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
