<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-03-22 -081 20:30:00.000"
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" >
2026.03.22 (081) 20:30:00</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">
FF202608103222030009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="28" >
<URSI ID="00" Val="11.100" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.481" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="27.541" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="2.500" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="30" Val="3.850" Name="foEs" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="4.150" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="11.500" 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="34" Val="95.000" Name="h`Es" 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="10.800" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="547.309" 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="1.826" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="4.150" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="4.150" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="387.952" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="293.146" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="9.629" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<Custom Name="fminEs" Val="2.500" Description="Minimum frequency of Es-layer" Units="MHz" />
<URSI ID="94" Val="131.749" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="44.857" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="66.813" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="151.380" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.390" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="2">
<Trace Type="standard" Layer="F2" Polarization="O" Num="140">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
275.000 275.000 275.000 275.000 275.000 280.000 280.000 280.000 280.000 280.000 280.000 285.000 290.000 290.000 290.000 290.000 290.000 295.000 295.000 295.000 295.000 300.000 300.000 305.000 305.000 305.000 305.000 307.500 310.000 310.000 310.000 310.000 315.000 315.000 315.000 317.500 320.000 320.000 325.000 330.000 330.000 330.000 330.000 330.000 335.000 340.000 340.000 342.500 345.000 350.000 350.000 350.000 355.000 355.000 360.000 360.000 360.000 365.000 370.000 370.000 375.000 375.000 377.500 380.000 382.500 385.000 390.000 390.000 390.000 395.000 395.000 395.000 405.000 405.000 405.000 405.000 410.000 410.000 415.000 415.000 420.000 420.000 420.000 425.000 430.000 430.000 432.500 435.000 435.000 435.000 440.000 440.000 440.000 440.000 445.000 450.000 450.000 450.000 450.000 455.000 457.500 460.000 465.000 465.000 467.500 470.000 470.000 475.000 476.250 477.500 478.750 480.000 485.000 485.000 486.667 488.333 490.000 495.000 505.000 507.500 510.000 510.000 515.000 515.000 525.000 530.000 530.000 531.590 533.381 535.414 537.741 540.432 543.579 547.309 551.799 557.309 564.230 573.186 585.228 602.281
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
57 66 60 63 54 57 57 63 0 0 45 0 57 0 51 0 63 57 0 0 0 51 51 48 0 0 54 0 57 66 63 60 66 69 72 0 66 66 66 54 63 51 66 66 0 57 66 0 63 54 60 63 63 66 66 69 63 60 57 60 60 66 0 0 0 66 54 54 63 66 69 69 54 63 72 72 75 75 72 78 66 69 72 0 54 63 0 57 54 60 57 57 0 63 0 60 54 63 63 60 0 66 48 63 0 63 63 57 0 0 0 60 57 57 0 0 54 57 48 0 45 48 51 51 51 45 54 54 48 45 45 51 48 0 0 45 0 0 0 42
</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 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -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 1.171875 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 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -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 -2.734375 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 1.953125 -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 -2.734375 -1.953125 -0.390625
</TraceValueList>
</Trace>
<Trace Type="standard" Layer="Es" Polarization="O" Num="28">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
95.000 100.000 98.750 97.500 96.250 95.000 96.250 97.500 98.750 100.000 100.000 100.000 100.455 100.909 101.364 101.818 102.273 102.727 103.182 103.636 104.091 104.545 105.000 105.000 105.000 105.000 105.000 105.000
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
60 0 0 0 0 72 0 0 0 66 66 63 0 0 0 0 0 0 0 0 51 0 48 0 0 0 54 51
</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
</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" >
89.813 90.0 95.0 100.0 105.0 110.0 115.0 119.199 120.0 125.0 128.398 130.0 135.0 137.597 140.0 145.0 150.0 155.0 160.0 165.0 170.0 175.0 180.0 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 387.952 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 1000.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.216 1.223 1.581 1.767 1.826 1.787 1.69 1.69 1.69 1.69 1.714 1.788 1.826 1.908 2.058 2.2 2.34 2.483 2.631 2.786 2.95 3.122 3.305 3.498 3.7 3.91 4.127 4.348 4.573 4.798 5.023 5.247 5.468 5.687 5.903 6.115 6.325 6.532 6.736 6.938 7.138 7.336 7.532 7.727 7.921 8.113 8.305 8.496 8.688 8.878 9.069 9.26 9.451 9.642 9.834 10.024 10.213 10.399 10.579 10.749 10.9 11.018 11.088 11.1 11.099 11.088 11.066 11.033 10.99 10.938 10.876 10.806 10.728 10.643 10.551 10.453 10.349 10.24 10.126 10.008 9.886 9.76 9.632 9.5 9.367 9.231 9.094 8.955 8.815 8.674 8.533 8.391 8.25 8.108 7.966 7.825 7.684 7.545 7.406 7.268 7.131 6.995 6.86 6.727 6.595 6.465 6.337 6.21 6.084 5.961 5.839 5.719 5.601 5.484 5.37 5.257 5.146 5.037 4.93 4.824 4.721 4.619 4.52 4.422 4.326 4.231 4.139 4.048 3.959 3.872 3.787 3.703 3.621 3.54 3.462 3.385 3.309 3.235 3.163 3.092 3.022 2.954 2.888 2.823 2.759 2.697 2.636 2.576 2.518 2.46 2.405 2.35 2.296 2.244 2.193 2.143 2.094 2.046 2.0 1.954 1.909 1.866 1.823 1.781 1.741 1.701 1.662 1.624 1.586 1.55 1.514 1.48 1.446 1.412 1.38 1.348 1.317 1.287 1.257 1.228 1.2 1.172 1.145 1.119 1.093 1.068 1.044

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="1.826" PeakHeight="110.0" Num="3" Error="0.0">
-28.78 10.734 -2.141
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="1.826" EndFrequency="11.1" PeakHeight="387.952" Num="5" zHalfNm="293.146" Error="3.512">
-221.318 -49.498 30.499 -15.045 5.007
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="27.597" Depth="0.136"/>
<TopsideChapman PeakHeight="387.952" PeakDensity="1528660.0" PeakScaleHeight="66.813" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
