<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-03-23 -082 09:50:00.000"
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="1 2 0 0 0 0 0 0 0 11 0 0 0 0 0 0 0 0 0 0 "/>
<Comments>AR.5002.44 Confidence: 100%</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" >
2026.03.23 (082) 09:50:00</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">
FF202608203230950009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="32" >
<URSI ID="00" Val="8.050" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="3.157" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="25.410" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="1.750" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="30" Val="6.000" Name="foEs" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="4.800" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="81" Val="1.750" Name="fminE" Units="MHz" QL="/" DL="/" />
<URSI ID="20" Val="1.910" Name="foE" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="8.400" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="260.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="260.000" Name="h`F2" Units="km" QL="/" DL="/" />
<URSI ID="24" Val="93.640" Name="h`E" Units="km" QL="/" DL="/" />
<URSI ID="34" Val="120.000" Name="h`Es" Units="km" QL="/" DL="/" />
<URSI ID="90" Val="92.365" Name="hmE" Units="km" QL="/" DL="/" />
<URSI ID="83" Val="2.340" Name="yE" Units="km" QL="/" DL="/" />
<URSI ID="86" Val="0.100" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="7.550" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="347.492" 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="2.017" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="4.800" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="4.800" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="276.280" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="202.759" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="5.816" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<Custom Name="fminEs" Val="2.600" Description="Minimum frequency of Es-layer" Units="MHz" />
<URSI ID="94" Val="102.285" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="19.184" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="55.769" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="110.490" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.870" Name="B1" QL="/" DL="/" />
<URSI ID="32" Val="4.800" Name="fbEs" Units="MHz" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="3">
<Trace Type="standard" Layer="F2" Polarization="O" Num="66">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
260.000 260.000 260.556 261.111 261.667 262.222 262.778 263.333 263.889 264.444 265.000 267.000 269.000 271.000 273.000 275.000 275.000 275.000 275.000 275.000 275.000 280.000 285.000 285.000 285.000 285.000 285.000 285.000 290.000 290.000 290.000 290.000 290.000 295.000 295.000 295.000 300.000 300.000 300.000 305.000 305.000 310.000 310.000 310.000 315.000 320.000 320.000 325.000 325.000 325.000 328.750 332.500 336.250 339.522 343.238 347.492 352.413 358.170 364.996 373.219 383.316 396.010 412.454 434.594 466.010 514.080
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
60 54 0 0 60 0 0 57 0 0 63 0 0 0 0 57 60 60 48 66 63 0 48 54 0 54 57 57 57 0 0 60 66 63 63 63 63 66 66 66 63 57 57 66 69 63 69 60 57 51 45 0 0 54 57 54 60 66 66 60 63 63 60 57 51 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 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 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
</TraceValueList>
</Trace>
<Trace Type="standard" Layer="E" Polarization="O" Num="4">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
1.75 1.8 1.85 1.9
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
93.640 94.420 95.295 96.292
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
54 54 0 57
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
0.390625 0.390625 -0.390625 -0.390625
</TraceValueList>
</Trace>
<Trace Type="standard" Layer="Es" Polarization="O" Num="69">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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 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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
160.000 155.000 156.667 158.333 160.000 155.000 140.000 140.000 145.000 135.000 125.000 125.000 125.000 125.000 125.000 125.000 120.000 125.000 130.000 120.000 120.833 121.667 122.500 123.333 124.167 125.000 122.500 120.000 120.000 120.000 120.000 120.000 120.000 120.000 120.000 120.000 120.000 120.000 120.000 120.000 120.000 120.000 120.000 120.000 120.000 120.000 120.000 120.000 120.000 120.000 120.000 120.000 120.000 120.000 120.000 120.000 120.000 120.000 120.000 120.000 120.000 120.000 120.000 125.000 125.000 125.000 125.000 122.500 120.000
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
51 54 0 0 51 54 63 63 0 57 69 63 0 0 69 63 54 0 69 66 0 0 0 0 0 0 0 60 57 0 0 66 69 0 0 0 66 66 0 66 0 66 0 0 0 0 0 0 66 69 0 0 0 0 0 0 0 66 0 0 0 0 63 0 63 57 0 0 60
</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 0.390625 -0.390625 0.390625 0.390625 -0.390625 0.390625 0.390625 0.390625 0.390625 -0.390625 -0.390625 0.390625 -0.390625 0.390625 0.390625 -0.390625 -0.390625 -0.390625 0.390625 -0.390625 0.390625 -0.390625 0.390625 0.390625 0.390625 -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" >
90.0 92.365 95.0 100.0 100.484 105.0 108.602 110.0 115.0 116.721 120.0 125.0 130.0 135.0 140.0 145.0 150.0 155.0 160.0 165.0 170.0 175.0 180.0 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 276.28 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 1000.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 1.91 1.897 1.8 1.785 1.785 1.785 1.807 1.884 1.91 2.015 2.195 2.391 2.597 2.808 3.022 3.238 3.455 3.675 3.897 4.122 4.35 4.583 4.82 5.062 5.307 5.555 5.804 6.054 6.301 6.542 6.775 6.995 7.201 7.388 7.554 7.698 7.819 7.914 7.985 8.03 8.049 8.05 8.047 8.031 8.005 7.968 7.921 7.864 7.8 7.727 7.647 7.561 7.469 7.372 7.27 7.164 7.055 6.942 6.827 6.71 6.59 6.47 6.348 6.225 6.102 5.979 5.856 5.733 5.611 5.489 5.368 5.248 5.13 5.012 4.896 4.782 4.669 4.557 4.448 4.34 4.234 4.13 4.028 3.927 3.829 3.732 3.638 3.545 3.454 3.365 3.279 3.194 3.111 3.03 2.95 2.873 2.797 2.723 2.651 2.581 2.512 2.445 2.38 2.316 2.254 2.194 2.135 2.077 2.021 1.967 1.914 1.862 1.811 1.762 1.714 1.668 1.622 1.578 1.535 1.493 1.453 1.413 1.374 1.337 1.3 1.265 1.23 1.196 1.164 1.132 1.101 1.07 1.041 1.012 0.985 0.958 0.931 0.906 0.881 0.856 0.833 0.81 0.788 0.766 0.745 0.724 0.704 0.685 0.666 0.648 0.63 0.613 0.596 0.579 0.563 0.548 0.533 0.518 0.504 0.49 0.476 0.463 0.45 0.438 0.426 0.414 0.403 0.391 0.381 0.37 0.36 0.35 0.34 0.331 0.322 0.313 0.304 0.296 0.288 0.28 0.272 0.265 0.257 0.25 0.243 0.236 0.23

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="1.91" PeakHeight="92.365" Num="3" Error="0.476">
-3.384 1.278 -0.259
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="1.91" EndFrequency="8.05" PeakHeight="276.28" Num="5" zHalfNm="202.759" Error="2.456">
-154.732 -6.218 0.857 1.544 -1.01
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="24.356" Depth="0.125"/>
<TopsideChapman PeakHeight="276.28" PeakDensity="804001.25" PeakScaleHeight="55.769" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
