<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-04-01 -091 12:50:00.000"
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 11 0 0 0 0 0 0 0 0 1 0 "/>
<Comments>AR.5002.44 Confidence: 95% PACIFIC flags: Multiple candidates for F2x cusp</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) 12:50:00</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">
FF202609104011250009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="25" >
<URSI ID="00" Val="10.750" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.637" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="28.350" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="4.500" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="4.500" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="11.100" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="215.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="215.000" 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="0.700" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="10.200" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="475.000" Name="h`(fMUF)" Units="km" QL="/" DL="/" />
<Modeled Name="foEp" Val="3.212" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="4.500" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="4.500" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<Modeled Name="foF1p" Val="4.277" Units="MHz" ModelName="IRI-90" />
<URSI ID="92" Val="335.516" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="238.809" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="7.886" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="125.880" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="43.520" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="69.547" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="156.950" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.360" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="1">
<Trace Type="standard" Layer="F2" Polarization="O" Num="126">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
215.000 215.000 218.750 222.500 226.250 230.000 235.000 239.211 243.421 247.632 251.842 256.053 260.263 264.474 268.684 272.895 277.105 281.316 285.526 289.737 293.947 298.158 302.368 306.579 310.789 315.000 310.000 310.000 310.000 310.000 310.000 312.500 315.000 310.000 310.000 315.000 315.000 310.000 310.000 315.000 315.000 315.000 315.000 315.000 315.000 315.000 315.000 315.000 320.000 320.000 320.000 320.000 320.000 320.000 320.000 323.000 326.000 329.000 332.000 335.000 335.000 335.000 340.000 340.000 340.000 340.000 340.000 345.000 345.000 350.000 350.000 355.000 355.000 355.000 360.000 360.000 365.000 365.000 370.000 370.000 375.000 375.000 380.000 380.000 385.000 390.000 390.000 395.000 395.000 400.000 400.000 405.000 410.000 415.000 415.000 420.000 420.000 425.000 425.000 430.000 435.000 435.000 440.000 440.000 445.000 450.000 450.000 455.000 460.000 460.000 465.000 470.000 470.000 475.000 475.000 485.000 490.000 490.000 495.000 500.000 505.000 512.605 521.670 532.664 546.272 563.555
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
45 48 0 0 0 51 48 0 0 45 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 60 60 60 60 60 0 48 60 63 54 51 63 66 66 66 69 69 69 66 63 63 60 66 66 63 57 51 57 54 0 0 0 0 57 66 69 54 60 63 69 69 69 72 63 66 57 63 69 66 69 63 66 63 69 63 60 63 63 60 57 63 57 60 57 57 57 51 48 57 51 54 48 51 54 51 57 57 54 57 54 57 51 48 51 54 48 57 57 54 54 48 54 54 54 48 0 42 0 0 0
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
0.390625 -0.390625 0.390625 -2.734375 -0.390625 -0.390625 -0.390625 2.734375 1.953125 -0.390625 -0.390625 0.390625 -1.171875 1.953125 -0.390625 2.734375 -1.171875 0.390625 -2.734375 0.390625 -1.953125 -0.390625 -2.734375 -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 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 -2.734375 -2.734375 1.953125 2.734375
</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" >
89.51 90.0 95.0 100.0 105.0 110.0 112.292 114.584 115.0 116.876 120.0 125.0 130.0 135.0 140.0 145.0 150.0 155.0 160.0 165.0 170.0 175.0 180.0 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 335.516 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 1000.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.239 2.16 2.78 3.107 3.212 3.09 3.09 3.112 3.212 3.319 3.478 3.631 3.78 3.93 4.081 4.235 4.393 4.555 4.722 4.894 5.071 5.254 5.441 5.633 5.828 6.027 6.228 6.431 6.634 6.839 7.042 7.246 7.448 7.649 7.849 8.047 8.243 8.438 8.631 8.823 9.012 9.2 9.385 9.568 9.748 9.924 10.094 10.256 10.407 10.54 10.648 10.721 10.75 10.75 10.746 10.731 10.706 10.672 10.63 10.578 10.519 10.453 10.379 10.299 10.213 10.121 10.025 9.924 9.818 9.708 9.595 9.479 9.36 9.239 9.115 8.989 8.862 8.733 8.604 8.473 8.342 8.21 8.079 7.947 7.815 7.683 7.552 7.421 7.291 7.162 7.033 6.906 6.78 6.655 6.531 6.408 6.286 6.166 6.048 5.931 5.815 5.701 5.589 5.478 5.369 5.261 5.155 5.051 4.949 4.848 4.749 4.651 4.555 4.461 4.368 4.277 4.188 4.1 4.014 3.93 3.847 3.765 3.685 3.607 3.53 3.455 3.381 3.309 3.238 3.168 3.1 3.033 2.968 2.904 2.841 2.78 2.719 2.66 2.603 2.546 2.491 2.436 2.383 2.331 2.28 2.231 2.182 2.134 2.087 2.042 1.997 1.953 1.91 1.868 1.827 1.787 1.748 1.709 1.671 1.635 1.599 1.563 1.529 1.495 1.462 1.43 1.398 1.368 1.337 1.308 1.279 1.251 1.223 1.196 1.169 1.144 1.118 1.094 1.069 1.046 1.023 1.0 0.978 0.956 0.935 0.914 0.894

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="3.212" PeakHeight="110.0" Num="3" Error="0.0">
-30.367 12.954 -3.077
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="3.212" EndFrequency="10.75" PeakHeight="335.516" Num="5" zHalfNm="238.809" Error="6.363">
-184.37 -45.892 15.062 -5.872 2.432
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="6.876" Depth="0.122"/>
<TopsideChapman PeakHeight="335.516" PeakDensity="1433777.9" PeakScaleHeight="69.547" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
