<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-03-18 -077 17:40:00.000"
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" >
2026.03.18 (077) 17:40:00</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">
FF202607703181740009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="25" >
<URSI ID="00" Val="10.500" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.609" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="27.397" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="3.900" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="3.900" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="10.800" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="175.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="175.000" 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="0.150" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="9.600" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="455.000" Name="h`(fMUF)" Units="km" QL="/" DL="/" />
<Modeled Name="foEp" Val="3.141" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="3.900" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="3.900" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<Modeled Name="foF1p" Val="4.243" Units="MHz" ModelName="IRI-90" />
<URSI ID="92" Val="356.474" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="250.961" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="9.304" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="140.174" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="46.533" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="78.459" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="170.540" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.470" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="1">
<Trace Type="standard" Layer="F2" Polarization="O" Num="133">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
175.000 180.000 190.000 200.000 210.000 220.000 230.000 232.500 235.000 241.667 248.333 255.000 255.000 258.125 261.250 264.375 267.500 270.625 273.750 276.875 280.000 280.000 285.000 285.000 288.333 291.667 295.000 295.000 300.000 300.000 300.000 305.000 305.000 305.000 310.000 310.000 312.500 315.000 315.000 315.000 315.000 316.429 317.857 319.286 320.714 322.143 323.571 325.000 330.000 330.000 330.000 330.000 330.000 335.000 335.000 335.000 335.000 340.000 342.500 345.000 347.500 350.000 350.000 350.000 355.000 355.000 360.000 360.000 360.000 360.000 360.000 365.000 365.000 365.000 370.000 370.000 375.000 375.000 380.000 380.000 380.000 385.000 385.000 390.000 390.000 392.500 395.000 395.000 400.000 405.000 405.000 405.000 410.000 410.000 415.000 417.500 420.000 420.000 425.000 425.000 430.000 430.000 430.000 435.000 435.000 440.000 440.000 440.000 445.000 450.000 450.000 455.000 455.000 455.000 455.000 460.000 465.000 470.000 475.000 479.434 484.301 489.668 495.616 502.244 509.676 518.068 527.620 538.588 551.314 566.256 584.049 605.594 632.220
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
51 48 0 0 0 0 51 0 60 0 0 48 51 0 54 0 0 0 0 0 54 54 51 0 0 0 54 60 54 57 54 60 60 57 63 60 0 60 57 54 54 0 0 0 0 51 0 63 57 0 66 63 57 57 57 60 63 66 0 0 0 57 63 69 60 60 45 0 57 63 63 63 57 57 60 63 57 63 48 57 63 63 66 60 60 0 51 51 51 45 48 51 48 51 45 0 57 63 57 63 60 63 66 57 57 54 63 57 57 45 48 51 54 48 0 48 0 0 48 51 54 54 51 51 51 0 0 0 42 0 42 45 45
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
-0.390625 -0.390625 -2.734375 -1.953125 -1.171875 0.390625 -0.390625 -0.390625 -0.390625 2.734375 2.734375 -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 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 -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 -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 -1.171875 0.390625 -0.390625 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" >
89.522 90.0 95.0 100.0 105.0 110.0 112.595 115.0 115.19 117.785 120.0 125.0 130.0 135.0 140.0 145.0 150.0 155.0 160.0 165.0 170.0 175.0 180.0 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 356.474 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 1000.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.238 2.112 2.719 3.039 3.141 3.019 3.019 3.019 3.141 3.213 3.367 3.514 3.658 3.799 3.94 4.082 4.224 4.368 4.513 4.661 4.811 4.963 5.119 5.277 5.438 5.602 5.769 5.939 6.112 6.287 6.465 6.646 6.829 7.013 7.2 7.388 7.578 7.768 7.959 8.15 8.34 8.53 8.718 8.904 9.087 9.265 9.439 9.605 9.764 9.913 10.05 10.173 10.28 10.368 10.435 10.479 10.499 10.5 10.498 10.488 10.471 10.446 10.414 10.375 10.33 10.279 10.222 10.159 10.092 10.02 9.943 9.863 9.778 9.69 9.599 9.505 9.407 9.308 9.206 9.102 8.996 8.889 8.78 8.67 8.559 8.447 8.334 8.221 8.107 7.993 7.879 7.764 7.65 7.536 7.422 7.309 7.196 7.084 6.972 6.861 6.751 6.641 6.533 6.425 6.318 6.212 6.108 6.004 5.902 5.8 5.7 5.601 5.503 5.407 5.311 5.217 5.124 5.033 4.943 4.854 4.766 4.679 4.594 4.51 4.428 4.346 4.266 4.187 4.11 4.033 3.958 3.885 3.812 3.74 3.67 3.601 3.533 3.467 3.401 3.337 3.273 3.211 3.15 3.09 3.031 2.973 2.916 2.86 2.805 2.751 2.699 2.647 2.596 2.546 2.496 2.448 2.401 2.355 2.309 2.264 2.22 2.177 2.135 2.094 2.053 2.013 1.974 1.935 1.898 1.861 1.824 1.789 1.754 1.72 1.686 1.653 1.621 1.589 1.558 1.528 1.498 1.468 1.44 1.411 1.384 1.357 1.33

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="3.141" PeakHeight="110.0" Num="3" Error="0.0">
-30.311 12.872 -3.039
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="3.141" EndFrequency="10.5" PeakHeight="356.474" Num="5" zHalfNm="250.961" Error="6.131">
-207.894 -39.404 8.215 -0.398 0.792
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="7.785" Depth="0.122"/>
<TopsideChapman PeakHeight="356.474" PeakDensity="1367866.0" PeakScaleHeight="78.459" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
