<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-04-02 -092 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 22 0 0 0 0 0 0 0 0 1 0 "/>
<Comments>AR.5002.44 Confidence: 85% PACIFIC flags: 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" >
2026.04.02 (092) 22:50:00</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">
FF202609204022250009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="25" >
<URSI ID="00" Val="11.150" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.710" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="30.214" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="2.000" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="2.000" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="11.450" 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="0.200" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="10.800" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="471.877" 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="2.000" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="2.000" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="393.309" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="339.373" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="7.783" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="79.686" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="26.502" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="40.154" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="80.580" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.880" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="1">
<Trace Type="standard" Layer="F2" Polarization="O" Num="184">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
2.0 2.05 2.1 2.15 2.2 2.25 2.3 2.35 2.4 2.45 2.5 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 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 10.45 10.5 10.55 10.6 10.65 10.7 10.75 10.8 10.85 10.9 10.95 11.0 11.05 11.1 11.15
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
305.000 305.000 305.625 306.250 306.875 307.500 308.125 308.750 309.375 310.000 310.000 310.000 310.000 310.000 310.455 310.909 311.364 311.818 312.273 312.727 313.182 313.636 314.091 314.545 315.000 315.000 310.000 310.000 312.500 315.000 317.500 320.000 320.000 320.000 320.000 320.000 320.000 320.000 325.000 325.000 325.000 325.000 325.000 325.000 325.000 330.000 330.000 330.000 325.000 330.000 330.000 330.000 330.000 330.000 335.000 335.000 335.000 335.000 335.000 335.000 340.000 340.000 340.000 340.000 340.000 340.000 340.000 340.000 340.000 340.000 340.000 340.000 340.000 340.000 345.000 346.111 347.222 348.333 349.444 350.556 351.667 352.778 353.889 355.000 355.000 355.000 355.000 355.000 355.000 357.500 360.000 360.000 360.000 360.000 360.000 360.000 360.000 362.500 365.000 365.000 365.000 365.000 365.000 370.000 370.000 370.000 370.000 370.000 370.000 375.000 375.000 375.000 375.000 375.000 375.000 380.000 380.000 380.000 380.000 380.000 380.000 385.000 385.000 385.000 390.000 390.000 390.000 390.000 390.000 395.000 395.000 395.000 395.000 400.000 400.000 400.000 400.000 400.000 400.000 405.000 405.000 405.000 410.000 415.000 415.000 415.000 415.000 415.000 420.000 420.000 420.000 420.000 430.000 430.000 430.000 430.000 430.000 432.500 435.000 437.500 440.000 440.000 440.000 445.000 445.000 445.000 450.000 450.000 455.000 456.380 457.904 459.595 461.481 463.600 465.997 468.731 471.877 475.537 479.848 485.000 491.267 499.053 508.988 522.104
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
60 60 0 60 0 0 0 0 0 51 0 0 0 63 0 0 0 0 0 0 0 0 0 0 63 69 69 0 0 0 0 0 0 0 0 0 66 63 51 54 0 0 0 48 0 54 0 57 60 63 0 0 0 63 54 0 0 0 0 63 51 51 54 60 0 63 66 0 48 0 69 0 0 66 48 0 0 57 0 0 0 0 0 51 54 63 0 66 72 0 57 60 63 69 0 69 72 0 60 66 66 69 69 57 60 66 69 69 72 60 63 69 69 72 75 63 66 75 75 75 78 69 72 78 63 66 72 75 75 63 69 72 72 63 69 72 72 72 72 72 75 72 69 57 63 69 72 72 69 69 63 66 57 63 51 69 69 0 66 0 66 0 63 60 57 54 51 54 48 51 51 51 51 51 51 48 48 45 48 48 0 48 0 0
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
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 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 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 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 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 1.171875 1.171875 0.390625 1.171875 1.171875 1.171875 1.171875 -2.734375 1.171875 1.171875 1.171875 0.390625 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 0.390625 1.171875 1.953125 1.171875
</TraceValueList>
</Trace>
</TraceList>
<ProfileList Num="1">
<Profile  Algorithm="NH" AlgorithmVersion="4.33" Type="vertical" >
<Tabulated Num="181">
<AltitudeList Type="float" Units="km" Description="Altitude above station level" >
93.502 95.0 100.0 105.0 110.0 115.0 120.0 125.0 130.0 135.0 140.0 143.77 145.0 150.0 155.0 160.0 165.0 170.0 175.0 177.539 180.0 185.0 190.0 195.0 200.0 205.0 210.0 211.309 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 393.309 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0
</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 0.309 0.28 0.241 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.211 0.234 0.257 0.28 0.302 0.325 0.348 0.354 0.427 0.517 0.612 0.715 0.832 0.966 1.12 1.298 1.502 1.735 1.998 2.289 2.606 2.946 3.307 3.684 4.075 4.478 4.891 5.312 5.741 6.175 6.614 7.055 7.498 7.939 8.377 8.806 9.223 9.622 9.995 10.334 10.628 10.866 11.037 11.132 11.15 11.148 11.121 11.063 10.978 10.869 10.737 10.586 10.417 10.234 10.037 9.831 9.615 9.393 9.165 8.932 8.698 8.461 8.224 7.987 7.752 7.518 7.287 7.059 6.834 6.614 6.397 6.185 5.978 5.775 5.578 5.386 5.198 5.016 4.84 4.668 4.501 4.34 4.184 4.032 3.886 3.744 3.607 3.474 3.346 3.223 3.104 2.988 2.877 2.77 2.667 2.567 2.471 2.378 2.289 2.203 2.12 2.04 1.963 1.889 1.818 1.749 1.683 1.619 1.558 1.499 1.442 1.387 1.334 1.284 1.235 1.188 1.143 1.099 1.058 1.017 0.979 0.941 0.906 0.871 0.838 0.806 0.775 0.746 0.717 0.69 0.664 0.638 0.614 0.591 0.568 0.546 0.526 0.506 0.486 0.468 0.45 0.433 0.416 0.4 0.385 0.37 0.356 0.343 0.33 0.317 0.305 0.293 0.282 0.271 0.261 0.251 0.241 0.232 0.223 0.215 0.207

</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="11.15" PeakHeight="393.309" Num="5" zHalfNm="339.373" Error="3.622">
-176.863 -10.465 7.353 -4.506 2.481
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="101.309" Depth="0.154"/>
<TopsideChapman PeakHeight="393.309" PeakDensity="1542462.8" PeakScaleHeight="40.154" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
