<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-03-31 -090 19:10:00.000"
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 F2x 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" >
2026.03.31 (090) 19:10:00</StartTime>
<SolarTerrestrialData>
<GyroFrequency Val="0.63" Model="IGRF 3.0" Altitude="300"/>
<DipAngle Val="-11.18" 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">
FF202609003311910009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="25" >
<URSI ID="00" Val="11.400" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.508" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="28.587" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="3.500" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="3.500" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="11.700" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="230.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="230.000" 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="0.450" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="10.750" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="510.000" 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="2.644" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="3.500" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="3.500" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="377.359" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="281.284" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="9.643" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="128.723" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="48.938" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="68.693" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="159.930" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.270" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="1">
<Trace Type="standard" Layer="F2" Polarization="O" Num="159">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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 11.2 11.25 11.3 11.35 11.4
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
230.000 230.000 230.000 232.500 235.000 237.500 240.000 242.143 244.286 246.429 248.571 250.714 252.857 255.000 250.000 253.333 256.667 260.000 263.333 266.667 270.000 270.000 275.000 275.000 275.000 275.000 280.000 280.000 285.000 290.000 290.000 292.500 295.000 297.500 300.000 302.500 305.000 305.000 305.000 300.000 302.500 305.000 310.000 315.000 315.000 320.000 320.000 322.500 325.000 325.000 325.000 325.000 325.000 335.000 335.000 335.000 337.500 340.000 340.000 340.000 340.000 341.667 343.333 345.000 348.333 351.667 355.000 355.000 355.000 360.000 360.000 360.000 365.000 365.000 365.000 370.000 370.000 370.000 375.000 375.000 380.000 380.000 380.000 380.000 385.000 385.000 387.500 390.000 390.000 395.000 395.000 400.000 400.000 400.000 405.000 405.000 410.000 410.000 415.000 415.000 415.000 420.000 420.000 425.000 425.000 425.000 430.000 430.000 435.000 435.000 437.500 440.000 442.500 445.000 445.000 445.000 445.000 445.000 450.000 455.000 456.667 458.333 460.000 460.000 462.500 465.000 460.000 465.000 470.000 470.000 475.000 480.000 480.000 480.000 480.000 485.000 490.000 490.000 490.000 495.000 500.000 500.000 505.000 505.000 510.000 510.000 520.000 520.000 525.000 528.810 533.038 537.759 543.064 549.068 555.919 563.810 572.996 583.827 596.787
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
51 51 51 0 48 0 45 0 0 0 0 0 0 48 51 0 0 60 0 0 51 57 48 0 60 60 60 60 0 51 57 0 0 0 0 0 48 57 57 60 0 63 51 60 66 60 66 54 60 66 0 0 0 54 0 60 0 57 60 63 63 0 0 63 0 45 57 63 63 54 63 60 51 63 63 57 63 66 60 63 51 60 66 69 63 66 57 66 69 66 69 60 66 69 63 69 63 66 57 63 66 63 66 57 63 69 63 66 54 60 51 60 0 54 0 63 66 63 63 54 0 0 54 57 48 57 63 51 60 63 54 45 51 54 54 51 48 54 51 51 51 54 51 45 45 45 51 48 51 51 54 54 54 54 51 54 42 0 0
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
-0.390625 -0.390625 0.390625 -1.953125 -0.390625 0.390625 1.171875 1.953125 1.171875 2.734375 -2.734375 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 -0.390625 1.953125 -0.390625 2.734375 -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 -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 -0.390625 0.390625 0.390625 -1.953125 0.390625 0.390625 0.390625 0.390625 0.390625 -0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 1.953125 -0.390625
</TraceValueList>
</Trace>
</TraceList>
<ProfileList Num="1">
<Profile  Algorithm="NH" AlgorithmVersion="4.33" Type="vertical" >
<Tabulated Num="188">
<AltitudeList Type="float" Units="km" Description="Altitude above station level" >
89.611 90.0 95.0 100.0 105.0 110.0 114.875 115.0 119.751 120.0 124.626 125.0 130.0 135.0 140.0 145.0 150.0 155.0 160.0 165.0 170.0 175.0 180.0 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 377.359 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 1000.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.232 1.776 2.289 2.558 2.644 2.521 2.521 2.521 2.527 2.644 2.653 2.77 2.891 3.016 3.145 3.28 3.42 3.566 3.717 3.874 4.036 4.204 4.376 4.553 4.734 4.919 5.106 5.295 5.487 5.679 5.873 6.067 6.262 6.456 6.651 6.846 7.04 7.235 7.429 7.623 7.817 8.011 8.205 8.4 8.594 8.789 8.984 9.18 9.376 9.572 9.769 9.966 10.162 10.357 10.55 10.738 10.917 11.083 11.227 11.335 11.393 11.4 11.398 11.387 11.364 11.331 11.288 11.235 11.174 11.105 11.028 10.944 10.853 10.756 10.653 10.545 10.433 10.316 10.195 10.071 9.944 9.814 9.681 9.546 9.41 9.272 9.133 8.993 8.852 8.711 8.569 8.427 8.286 8.144 8.004 7.863 7.724 7.585 7.447 7.31 7.175 7.041 6.908 6.776 6.646 6.518 6.391 6.265 6.141 6.019 5.899 5.781 5.664 5.549 5.436 5.324 5.215 5.107 5.001 4.897 4.794 4.694 4.595 4.498 4.403 4.309 4.218 4.128 4.039 3.953 3.868 3.785 3.703 3.623 3.545 3.468 3.392 3.319 3.246 3.175 3.106 3.038 2.972 2.906 2.843 2.78 2.719 2.659 2.6 2.543 2.487 2.432 2.378 2.325 2.274 2.224 2.174 2.126 2.079 2.033 1.987 1.943 1.9 1.858 1.816 1.776 1.736 1.697 1.66 1.623 1.586 1.551 1.516 1.482 1.449 1.417 1.385 1.354 1.324 1.294 1.265 1.237 1.209 1.182 1.156 1.13 1.104

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="2.644" PeakHeight="110.0" Num="3" Error="0.0">
-29.865 12.226 -2.75
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="2.644" EndFrequency="11.4" PeakHeight="377.359" Num="5" zHalfNm="281.284" Error="3.16">
-208.558 -59.755 22.719 -8.932 1.793
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="14.626" Depth="0.123"/>
<TopsideChapman PeakHeight="377.359" PeakDensity="1612407.0" PeakScaleHeight="68.693" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
