<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-02-24 -055 10:10:00.000"
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 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" >
2026.02.24 (055) 10:10:00</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">
FF202605502241010009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="31" >
<URSI ID="00" Val="8.600" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="3.079" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="26.480" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="1.900" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="30" Val="2.600" Name="foEs" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="2.800" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="81" Val="1.900" Name="fminE" Units="MHz" QL="/" DL="/" />
<URSI ID="20" Val="2.360" Name="foE" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="9.000" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="230.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="230.000" Name="h`F2" Units="km" QL="/" DL="/" />
<URSI ID="24" Val="113.517" Name="h`E" Units="km" QL="/" DL="/" />
<URSI ID="34" Val="121.250" Name="h`Es" Units="km" QL="/" DL="/" />
<URSI ID="90" Val="106.884" Name="hmE" Units="km" QL="/" DL="/" />
<URSI ID="83" Val="16.609" Name="yE" Units="km" QL="/" DL="/" />
<URSI ID="86" Val="0.100" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="8.000" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="355.000" 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="2.199" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="3.000" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="3.000" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="293.152" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="220.039" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="6.305" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<Custom Name="fminEs" Val="2.400" Description="Minimum frequency of Es-layer" Units="MHz" />
<URSI ID="94" Val="102.189" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="22.174" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="56.365" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="95.770" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="2.410" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="3">
<Trace Type="standard" Layer="F2" Polarization="O" Num="117">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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 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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
240.000 235.000 235.000 235.000 230.000 230.000 230.000 235.000 235.000 235.000 235.000 240.000 240.000 240.000 240.000 240.000 245.000 245.000 245.000 245.000 245.000 245.000 245.000 245.000 250.000 252.500 255.000 255.000 254.000 253.000 252.000 251.000 250.000 250.000 250.000 250.000 255.000 255.000 255.000 255.000 255.000 255.000 257.500 260.000 260.000 260.000 262.500 265.000 265.000 265.000 265.000 265.000 265.000 265.000 270.000 271.500 273.000 274.500 276.000 277.500 279.000 280.500 282.000 283.500 285.000 285.000 285.000 285.000 285.000 290.000 290.000 290.000 290.000 290.000 295.000 295.000 296.667 298.333 300.000 300.000 300.000 305.000 305.000 305.000 310.000 310.000 310.000 312.500 315.000 320.000 320.000 320.000 325.000 325.000 330.000 330.000 330.000 335.000 340.000 340.000 345.000 350.000 350.000 355.000 355.000 365.000 365.000 370.000 375.128 381.366 389.117 399.008 412.066 430.104 456.640 499.531 580.632
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
60 54 0 57 57 0 60 60 54 69 66 54 0 54 60 63 0 0 0 0 0 0 57 57 0 0 0 0 0 0 0 0 51 57 0 54 63 0 0 63 60 54 0 60 0 66 0 72 0 0 0 0 0 60 66 0 0 0 0 0 0 0 0 51 57 60 66 45 69 57 0 60 45 69 60 63 48 0 63 66 66 60 63 66 54 57 63 0 60 51 60 63 60 66 60 66 66 66 63 69 69 63 69 69 69 69 69 69 69 66 69 69 66 63 57 0 45
</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 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 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 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 0.390625 0.390625 0.390625 0.390625 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
</TraceValueList>
</Trace>
<Trace Type="standard" Layer="E" Polarization="O" Num="10">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
1.9 1.95 2.0 2.05 2.1 2.15 2.2 2.25 2.3 2.35
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
113.517 114.217 114.991 115.860 116.848 117.996 119.371 121.097 123.449 127.295
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
0 0 0 0 0 0 63 60 0 54
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
0.390625 1.953125 0.390625 -1.171875 0.390625 0.390625 0.390625 0.390625 -1.953125 0.390625
</TraceValueList>
</Trace>
<Trace Type="standard" Layer="Es" Polarization="O" Num="5">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
2.4 2.45 2.5 2.55 2.6
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
121.250 122.500 123.750 125.000 125.000
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
0 0 0 60 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
</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 95.0 100.0 105.0 106.884 110.0 114.016 115.0 120.0 121.147 125.0 128.279 130.0 135.0 140.0 145.0 150.0 155.0 160.0 165.0 170.0 175.0 180.0 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 293.152 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 1000.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 1.666 2.146 2.344 2.36 2.334 2.222 2.222 2.222 2.222 2.297 2.36 2.393 2.493 2.599 2.711 2.832 2.961 3.1 3.251 3.415 3.595 3.792 4.009 4.248 4.51 4.795 5.1 5.421 5.75 6.079 6.399 6.706 6.993 7.258 7.501 7.719 7.912 8.082 8.227 8.348 8.445 8.519 8.569 8.595 8.6 8.599 8.588 8.565 8.53 8.484 8.429 8.364 8.291 8.21 8.122 8.028 7.928 7.823 7.713 7.599 7.482 7.361 7.238 7.113 6.986 6.858 6.729 6.599 6.469 6.339 6.209 6.079 5.95 5.822 5.694 5.568 5.443 5.319 5.197 5.077 4.958 4.84 4.725 4.611 4.5 4.39 4.282 4.177 4.073 3.971 3.872 3.774 3.678 3.585 3.493 3.404 3.316 3.23 3.147 3.065 2.985 2.907 2.831 2.757 2.684 2.613 2.544 2.477 2.411 2.347 2.285 2.224 2.165 2.107 2.05 1.996 1.942 1.89 1.839 1.79 1.742 1.695 1.649 1.604 1.561 1.519 1.478 1.438 1.399 1.361 1.324 1.288 1.253 1.219 1.186 1.154 1.123 1.092 1.063 1.034 1.005 0.978 0.952 0.926 0.9 0.876 0.852 0.829 0.806 0.784 0.763 0.742 0.722 0.702 0.683 0.664 0.646 0.629 0.611 0.595 0.579 0.563 0.547 0.532 0.518 0.504 0.49 0.477 0.464 0.451 0.439 0.427 0.415 0.404 0.393 0.382 0.371 0.361 0.351 0.342 0.333 0.323 0.315 0.306 0.298 0.289 0.282

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="2.36" PeakHeight="106.884" Num="3" Error="5.844">
-24.543 9.786 -2.127
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="2.36" EndFrequency="8.6" PeakHeight="293.152" Num="5" zHalfNm="220.039" Error="4.003">
-149.613 -5.562 -10.25 0.122 0.43
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="21.395" Depth="0.138"/>
<TopsideChapman PeakHeight="293.152" PeakDensity="917617.9" PeakScaleHeight="56.365" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
