<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-03-19 -078 13:10:00.000"
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="1 2 0 1 0 0 0 0 0 33 0 0 0 0 0 0 0 0 1 0 "/>
<Comments>AR.5002.44 Confidence: 60% PACIFIC flags: Multiple candidates for F2x cusp, Multiple candidates for F2o cusp, F2 cusps do not match</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" >
2026.03.19 (078) 13:10:00</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">
FF202607803191310009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="33" >
<URSI ID="00" Val="9.525" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="10" Val="5.023" Name="foF1" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.617" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="24.864" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="3.200" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="4.150" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="81" Val="3.200" Name="fminE" Units="MHz" QL="/" DL="/" />
<URSI ID="20" Val="3.260" Name="foE" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="8.150" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="190.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="310.000" Name="h`F2" Units="km" QL="/" DL="/" />
<URSI ID="24" Val="105.216" Name="h`E" 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="0.100" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="7.450" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="352.000" Name="h`(fMUF)" Units="km" QL="/" DL="/" />
<Custom Name="dlt foF2" Val="0.025" Description="Adjustment to the scaled foF2 during profile inversion" Units="MHz" />
<Modeled Name="foEp" Val="3.265" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="4.200" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="5.050" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<Modeled Name="foF1p" Val="4.302" Units="MHz" ModelName="IRI-90" />
<URSI ID="92" Val="358.198" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="91" Val="177.595" Name="hmF1" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="227.099" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="7.348" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="176.308" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="95" Val="72.234" Name="yF1" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="47.423" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="99.775" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="191.360" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="2.000" Name="B1" QL="/" DL="/" />
<URSI ID="D2" Val="0.390" Name="D1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="3">
<Trace Type="standard" Layer="F2" Polarization="O" Num="90">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
310.000 310.000 310.000 310.000 310.000 310.000 310.000 310.000 312.500 315.000 315.000 315.000 315.000 315.000 315.000 315.000 315.000 315.000 320.000 320.000 320.000 320.000 320.000 320.000 320.000 320.000 325.000 325.000 325.000 326.667 328.333 330.000 331.667 333.333 335.000 335.000 335.000 335.000 335.000 335.000 335.000 340.000 340.000 340.000 340.000 343.000 346.000 349.000 352.000 355.000 360.000 370.000 390.000 390.000 395.000 395.000 400.000 400.000 405.000 410.000 415.000 420.000 420.000 425.000 430.000 430.000 435.000 440.000 450.000 455.000 460.000 465.000 470.000 475.000 485.000 490.000 495.000 505.000 515.000 525.000 535.000 547.528 561.324 576.589 593.572 612.580 633.998 658.316 686.165 718.374
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
60 60 60 60 60 57 54 54 0 54 57 57 54 54 51 0 57 60 51 48 0 51 57 57 0 57 57 0 54 0 0 0 0 0 54 0 57 60 0 60 51 63 66 63 51 0 57 0 0 60 60 54 60 60 57 57 57 63 63 63 60 57 63 60 63 66 63 66 66 57 0 57 54 57 60 51 57 63 63 60 57 54 51 54 51 54 51 54 48 0
</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 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 0.390625 0.390625 0.390625 0.390625 0.390625 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 2.734375
</TraceValueList>
</Trace>
<Trace Type="standard" Layer="F1" Polarization="O" Num="18">
<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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
195.000 190.000 193.750 197.500 201.250 205.000 205.000 205.000 210.000 220.000 230.000 245.000 260.000 275.000 290.000 295.000 305.000 310.000
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
48 48 0 0 0 54 45 51 57 0 51 51 0 48 48 51 57 57
</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
</TraceValueList>
</Trace>
<Trace Type="standard" Layer="E" Polarization="O" Num="2">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
3.2 3.25
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
105.216 106.540
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
51 51
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
-0.390625 0.390625
</TraceValueList>
</Trace>
</TraceList>
<ProfileList Num="1">
<Profile  Algorithm="NH" AlgorithmVersion="4.33" Type="vertical" >
<Tabulated Num="189">
<AltitudeList Type="float" Units="km" Description="Altitude above station level" >
89.503 90.0 95.0 100.0 105.0 110.0 112.068 114.137 115.0 116.205 120.0 125.0 130.0 135.0 140.0 145.0 150.0 155.0 160.0 165.0 170.0 175.0 177.595 180.0 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 358.198 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 1000.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.239 2.193 2.821 3.154 3.26 3.138 3.138 3.189 3.26 3.436 3.637 3.885 4.154 4.352 4.496 4.612 4.712 4.8 4.881 4.955 5.013 5.023 5.106 5.262 5.409 5.555 5.706 5.865 6.036 6.222 6.424 6.641 6.866 7.088 7.298 7.491 7.668 7.829 7.976 8.113 8.239 8.358 8.47 8.576 8.676 8.771 8.863 8.95 9.033 9.112 9.187 9.258 9.323 9.382 9.433 9.475 9.505 9.522 9.525 9.525 9.521 9.512 9.5 9.483 9.462 9.437 9.408 9.376 9.341 9.302 9.26 9.215 9.167 9.117 9.064 9.009 8.951 8.891 8.829 8.765 8.7 8.633 8.564 8.493 8.422 8.349 8.275 8.2 8.124 8.047 7.969 7.891 7.812 7.732 7.652 7.572 7.491 7.41 7.329 7.247 7.166 7.084 7.003 6.921 6.84 6.759 6.678 6.597 6.517 6.437 6.357 6.277 6.198 6.12 6.042 5.964 5.887 5.81 5.734 5.659 5.584 5.509 5.436 5.362 5.29 5.218 5.147 5.076 5.007 4.938 4.869 4.801 4.734 4.668 4.602 4.537 4.473 4.41 4.347 4.285 4.224 4.163 4.103 4.044 3.985 3.928 3.871 3.814 3.759 3.704 3.65 3.596 3.543 3.491 3.44 3.389 3.339 3.289 3.24 3.192 3.145 3.098 3.052 3.006 2.961 2.917 2.873 2.83 2.787 2.745 2.704 2.663 2.623 2.583 2.544 2.506 2.468 2.43 2.394 2.357 2.322 2.286 2.251 2.217 2.183 2.15 2.117 2.085

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="3" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="3.26" PeakHeight="110.0" Num="3" Error="0.0">
-30.404 13.009 -3.102
</ShiftedChebyshev>
<ShiftedChebyshev Region="F1" StartFrequency="3.26" EndFrequency="5.023" PeakHeight="177.595" Num="5" Error="0.0">
-57.988 -7.236 7.184 -5.304 1.954
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="5.023" EndFrequency="9.525" PeakHeight="358.198" Num="5" zHalfNm="227.099" Error="7.895">
-174.422 -9.451 9.184 -9.827 3.913
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="6.205" Depth="0.122"/>
<TopsideChapman PeakHeight="358.198" PeakDensity="1125628.1" PeakScaleHeight="99.775" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
