<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-03-20 -079 21:10:00.000"
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: 80% PACIFIC flags: Multiple candidates for F2x cusp, 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" >
2026.03.20 (079) 21:10:00</StartTime>
<SolarTerrestrialData>
<GyroFrequency Val="0.63" Model="IGRF 3.0" Altitude="300"/>
<DipAngle Val="-11.17" 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">
FF202607903202110009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="25" >
<URSI ID="00" Val="11.300" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.881" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="32.556" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="3.200" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="3.200" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="11.950" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="275.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="275.000" 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="0.350" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="11.100" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="437.233" 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="1.024" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="3.200" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="3.200" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="345.513" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="297.390" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="9.370" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="70.916" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="24.875" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="34.935" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="84.060" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.170" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="1">
<Trace Type="standard" Layer="F2" Polarization="O" Num="163">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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 11.2 11.25 11.3
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
275.000 275.000 275.000 280.000 280.000 280.000 280.000 280.000 280.000 285.000 285.417 285.833 286.250 286.667 287.083 287.500 287.917 288.333 288.750 289.167 289.583 290.000 290.000 290.833 291.667 292.500 293.333 294.167 295.000 295.000 300.000 300.000 300.000 295.000 297.000 299.000 301.000 303.000 305.000 305.000 310.000 310.000 310.000 310.000 310.000 315.000 315.000 315.000 315.000 316.667 318.333 320.000 320.000 320.000 320.000 321.000 322.000 323.000 324.000 325.000 326.250 327.500 328.750 330.000 330.000 331.250 332.500 333.750 335.000 335.000 335.000 335.000 335.000 335.000 337.500 340.000 340.000 340.000 342.500 345.000 345.625 346.250 346.875 347.500 348.125 348.750 349.375 350.000 350.000 352.500 355.000 355.000 355.000 357.500 360.000 362.500 365.000 365.000 365.000 360.000 365.000 367.500 370.000 370.000 370.000 370.000 375.000 375.000 375.000 377.500 380.000 380.000 380.000 380.000 382.500 385.000 385.000 385.000 390.000 390.000 390.000 390.000 390.000 390.000 395.000 395.000 395.000 395.000 397.000 399.000 401.000 403.000 405.000 410.000 410.000 410.000 410.000 415.000 412.500 410.000 410.000 411.250 412.500 413.750 415.000 425.000 425.000 425.000 425.000 425.617 426.306 427.081 427.957 428.957 430.110 431.451 433.033 434.926 437.233 440.104 443.776 448.641 455.388
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
69 60 57 72 72 0 0 0 66 72 0 0 0 0 0 0 0 0 0 0 0 72 69 0 0 0 0 0 69 0 66 69 0 0 0 0 0 0 66 69 60 0 0 0 48 54 0 63 66 0 0 57 0 63 69 51 0 0 0 66 0 0 0 60 66 0 0 0 60 0 66 72 57 72 0 69 0 72 60 66 0 69 0 0 0 0 0 69 72 66 72 69 75 0 69 0 57 0 66 69 72 0 63 69 66 72 60 0 69 54 60 63 69 69 57 63 66 69 57 63 66 66 72 66 66 66 69 69 0 0 63 0 66 48 54 60 63 48 0 63 63 0 54 0 0 54 57 60 60 57 57 0 0 0 0 54 0 0 0 42 0 54 54
</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 -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 -1.171875 -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 -1.171875 -1.171875 -2.734375 -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 2.734375 -1.171875 -1.171875 2.734375 -1.171875 2.734375 -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 -1.953125 -1.953125 -1.171875 -1.953125 -1.171875 -1.171875 -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 -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 2.734375 0.390625 -1.953125 -1.953125 -1.953125 -1.953125
</TraceValueList>
</Trace>
</TraceList>
<ProfileList Num="1">
<Profile  Algorithm="NH" AlgorithmVersion="4.33" Type="vertical" >
<Tabulated Num="157">
<AltitudeList Type="float" Units="km" Description="Altitude above station level" >
90.247 95.0 100.0 105.0 110.0 115.0 120.0 125.0 126.445 130.0 135.0 140.0 142.889 145.0 150.0 155.0 159.334 160.0 165.0 170.0 175.0 180.0 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 345.513 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.682 0.887 0.991 1.024 1.007 0.953 0.858 0.821 0.821 0.821 0.821 0.821 0.847 0.909 0.97 1.024 1.055 1.234 1.387 1.536 1.688 1.847 2.014 2.191 2.38 2.58 2.794 3.019 3.257 3.507 3.767 4.036 4.315 4.602 4.896 5.197 5.503 5.816 6.135 6.459 6.79 7.127 7.47 7.82 8.178 8.544 8.918 9.301 9.691 10.087 10.48 10.853 11.157 11.299 11.3 11.282 11.223 11.127 10.997 10.839 10.655 10.449 10.226 9.987 9.736 9.476 9.209 8.937 8.662 8.386 8.111 7.836 7.565 7.296 7.033 6.774 6.52 6.273 6.032 5.797 5.569 5.348 5.134 4.927 4.726 4.533 4.346 4.166 3.993 3.826 3.666 3.512 3.363 3.221 3.084 2.953 2.827 2.706 2.59 2.479 2.372 2.27 2.172 2.078 1.988 1.902 1.82 1.741 1.666 1.593 1.524 1.458 1.394 1.334 1.276 1.22 1.167 1.116 1.067 1.021 0.976 0.934 0.893 0.854 0.817 0.781 0.747 0.714 0.683 0.653 0.625 0.597 0.571 0.546 0.523 0.5 0.478 0.457 0.437 0.418 0.4 0.382 0.365 0.349 0.334 0.32 0.306 0.292 0.279 0.267 0.256 0.244 0.234 0.223 0.214 0.204

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="1.024" PeakHeight="110.0" Num="3" Error="0.0">
-26.609 8.11 -1.254
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="1.024" EndFrequency="11.3" PeakHeight="345.513" Num="5" zHalfNm="297.39" Error="2.79">
-154.423 -49.586 21.875 -6.977 2.932
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="49.334" Depth="0.203"/>
<TopsideChapman PeakHeight="345.513" PeakDensity="1584243.1" PeakScaleHeight="34.935" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
