<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-02-26 -057 15:10:00.000"
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 0 0 0 0 0 0 11 0 0 0 0 0 0 0 0 1 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" >
2026.02.26 (057) 15:10:00</StartTime>
<SolarTerrestrialData>
<GyroFrequency Val="0.63" Model="IGRF 3.0" Altitude="300"/>
<DipAngle Val="-11.15" 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">
FF202605702261510009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="32" >
<URSI ID="00" Val="11.050" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.642" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="29.199" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="3.450" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="30" Val="5.550" Name="foEs" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="5.700" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="81" Val="3.450" Name="fminE" Units="MHz" QL="/" DL="/" />
<URSI ID="20" Val="3.510" Name="foE" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="11.350" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="310.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="310.000" Name="h`F2" Units="km" QL="/" DL="/" />
<URSI ID="24" Val="103.449" Name="h`E" Units="km" QL="/" DL="/" />
<URSI ID="34" Val="116.667" 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="10.300" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="460.000" 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="3.403" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="5.700" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="5.700" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<Modeled Name="foF1p" Val="4.366" Units="MHz" ModelName="IRI-90" />
<URSI ID="92" Val="337.084" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="245.080" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="7.532" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<Custom Name="fminEs" Val="3.550" Description="Minimum frequency of Es-layer" Units="MHz" />
<URSI ID="94" Val="115.157" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="44.275" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="65.844" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="166.380" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.060" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="3">
<Trace Type="standard" Layer="F2" Polarization="O" Num="108">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
310.000 310.000 312.500 315.000 315.000 315.000 320.000 320.000 320.000 320.000 320.000 322.500 325.000 330.000 330.000 330.000 330.000 330.000 330.000 330.000 330.000 330.000 335.000 340.000 337.500 335.000 338.333 341.667 345.000 345.000 345.000 345.000 350.000 350.000 350.000 355.000 356.667 358.333 360.000 361.667 363.333 365.000 366.667 368.333 370.000 371.667 373.333 375.000 376.667 378.333 380.000 381.667 383.333 385.000 385.000 385.000 390.000 390.000 385.000 395.000 395.000 400.000 400.000 405.000 405.000 405.000 410.000 410.000 410.000 420.000 420.000 420.000 425.000 425.000 430.000 430.000 430.000 435.000 437.500 440.000 440.000 445.000 445.000 450.000 450.000 455.000 455.833 456.667 457.500 458.333 459.167 460.000 460.000 465.000 475.000 480.000 480.000 485.000 487.093 489.487 492.251 495.477 499.293 503.877 509.487 516.509 525.555 537.646
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
57 51 0 54 60 60 54 54 54 54 57 0 57 0 0 0 57 60 57 0 51 48 63 63 0 66 0 0 60 66 66 66 66 63 63 57 0 0 0 0 0 0 60 48 0 66 0 51 0 45 0 0 0 48 57 63 54 54 0 51 60 57 63 57 60 60 60 63 57 48 51 54 48 60 54 54 54 54 0 45 57 51 54 42 51 45 0 0 48 0 0 0 42 0 57 54 60 54 57 54 0 0 0 48 51 54 51 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 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 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 1.953125 -0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 -2.734375 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 -2.734375 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 1.171875
</TraceValueList>
</Trace>
<Trace Type="standard" Layer="E" Polarization="O" Num="2">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
3.45 3.5
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
103.449 105.721
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
57 54
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
0.390625 0.390625
</TraceValueList>
</Trace>
<Trace Type="standard" Layer="Es" Polarization="O" Num="41">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
103.750 102.500 101.250 100.000 102.500 105.000 105.000 105.000 105.000 105.000 105.000 105.000 105.000 105.000 106.333 107.667 109.000 110.333 111.667 113.000 114.333 115.667 117.000 118.333 119.667 121.000 122.333 123.667 125.000 125.000 125.000 125.000 125.000 125.000 125.000 125.000 125.000 125.000 125.000 120.000 120.000
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
0 57 0 54 0 0 0 0 0 0 0 0 57 54 0 0 0 0 0 0 0 0 0 0 0 0 45 0 54 57 51 0 0 0 0 0 0 0 60 69 63
</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 1.953125 0.390625 -0.390625 0.390625 0.390625 0.390625 2.734375 1.171875 -2.734375 0.390625 -1.953125 -0.390625 0.390625 -0.390625 0.390625 -0.390625 -0.390625 0.390625 -0.390625 -0.390625 -1.171875 -1.171875 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" >
89.466 90.0 95.0 100.0 105.0 110.0 111.499 112.998 114.497 115.0 120.0 125.0 130.0 135.0 140.0 145.0 150.0 155.0 160.0 165.0 170.0 175.0 180.0 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 337.084 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 1000.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.242 2.362 3.037 3.396 3.51 3.383 3.383 3.51 3.535 3.745 3.923 4.088 4.245 4.397 4.548 4.697 4.847 4.997 5.148 5.3 5.454 5.609 5.767 5.927 6.088 6.252 6.417 6.585 6.755 6.926 7.1 7.275 7.452 7.63 7.811 7.993 8.176 8.361 8.548 8.737 8.927 9.118 9.312 9.507 9.703 9.9 10.098 10.295 10.488 10.672 10.838 10.97 11.043 11.05 11.048 11.035 11.01 10.975 10.929 10.874 10.809 10.736 10.655 10.567 10.472 10.371 10.264 10.152 10.035 9.914 9.79 9.661 9.53 9.396 9.26 9.122 8.983 8.842 8.7 8.558 8.415 8.272 8.128 7.985 7.843 7.7 7.559 7.418 7.278 7.14 7.002 6.866 6.731 6.598 6.466 6.335 6.207 6.08 5.955 5.831 5.71 5.59 5.472 5.356 5.242 5.13 5.02 4.911 4.805 4.701 4.598 4.497 4.398 4.301 4.206 4.113 4.022 3.932 3.844 3.758 3.674 3.591 3.51 3.431 3.353 3.277 3.203 3.13 3.059 2.989 2.921 2.854 2.789 2.725 2.662 2.601 2.542 2.483 2.426 2.37 2.315 2.262 2.21 2.159 2.109 2.06 2.012 1.966 1.92 1.875 1.832 1.789 1.748 1.707 1.668 1.629 1.591 1.554 1.518 1.482 1.448 1.414 1.381 1.349 1.317 1.287 1.257 1.227 1.199 1.171 1.143 1.117 1.09 1.065 1.04 1.016 0.992 0.969 0.946 0.924 0.902 0.881 0.861 0.841 0.821 0.802 0.783

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="3.51" PeakHeight="110.0" Num="3" Error="0.0">
-30.582 13.274 -3.226
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="3.51" EndFrequency="11.05" PeakHeight="337.084" Num="5" zHalfNm="245.08" Error="4.004">
-176.372 -65.085 20.178 -2.962 1.654
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="4.497" Depth="0.127"/>
<TopsideChapman PeakHeight="337.084" PeakDensity="1514919.4" PeakScaleHeight="65.844" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
