<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-02-23 -054 11:10:00.000"
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="2 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" >
2026.02.23 (054) 11:10:00</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">
FF202605402231110009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="28" >
<URSI ID="00" Val="9.600" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.807" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="26.945" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="2.850" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="30" Val="3.400" Name="foEs" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="3.400" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="10.100" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="220.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="220.000" Name="h`F2" Units="km" QL="/" DL="/" />
<URSI ID="34" Val="115.000" 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="0.100" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="8.800" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="405.000" 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="2.715" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="3.400" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="3.400" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="323.517" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="227.192" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="7.047" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<Custom Name="fminEs" Val="2.850" Description="Minimum frequency of Es-layer" Units="MHz" />
<URSI ID="94" Val="132.127" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="35.320" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="72.377" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="137.920" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="2.030" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="2">
<Trace Type="standard" Layer="F2" Polarization="O" Num="125">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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 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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
220.000 220.000 221.000 222.000 223.000 224.000 225.000 225.000 227.500 230.000 232.500 235.000 235.000 237.500 240.000 241.667 243.333 245.000 250.000 247.500 245.000 245.000 246.667 248.333 250.000 251.667 253.333 255.000 255.000 255.000 265.000 265.000 265.000 265.000 265.000 270.000 267.500 265.000 270.000 270.000 270.000 272.500 275.000 275.000 275.000 275.000 275.000 275.000 280.000 281.250 282.500 283.750 285.000 290.000 291.667 293.333 295.000 295.000 295.000 295.000 295.000 295.000 300.000 302.500 305.000 305.000 307.500 310.000 310.000 315.000 315.000 315.000 315.000 320.000 320.000 325.000 325.000 330.000 330.000 330.000 335.000 335.000 335.000 340.000 345.000 345.000 345.000 345.000 350.000 355.000 355.000 355.000 360.000 365.000 365.000 370.000 370.000 375.000 375.000 380.000 385.000 385.000 390.000 395.000 395.000 400.000 400.000 405.000 405.000 415.000 420.000 425.000 430.000 430.000 435.000 440.000 450.000 455.000 465.000 475.000 485.000 500.000 523.180 557.280 612.392
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
51 54 0 0 0 0 51 54 48 51 0 48 51 0 51 0 0 57 48 0 57 0 0 0 54 0 0 60 0 54 0 0 0 0 60 0 0 60 0 0 63 0 0 63 0 0 63 60 66 0 0 0 66 57 0 45 51 0 60 66 57 63 63 54 60 63 54 63 66 54 63 66 69 63 69 60 66 54 63 66 60 66 69 63 54 63 66 66 66 60 66 69 69 60 66 63 69 66 69 66 60 66 63 57 66 63 66 66 66 63 60 60 57 63 63 60 63 60 63 60 57 57 54 51 42
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
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 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 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -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
</TraceValueList>
</Trace>
<Trace Type="standard" Layer="Es" Polarization="O" Num="12">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
2.85 2.9 2.95 3.0 3.05 3.1 3.15 3.2 3.25 3.3 3.35 3.4
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
120.000 115.000 118.333 121.667 125.000 125.000 125.000 125.000 122.500 120.000 120.000 120.000
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
51 51 0 0 48 51 54 57 0 60 60 51
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
0.390625 0.390625 -0.390625 0.390625 -1.953125 -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" >
89.597 90.0 95.0 100.0 105.0 110.0 114.534 115.0 119.069 120.0 123.603 125.0 130.0 135.0 140.0 145.0 150.0 155.0 160.0 165.0 170.0 175.0 180.0 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 323.517 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 1000.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.233 1.824 2.35 2.627 2.715 2.592 2.592 2.592 2.617 2.715 2.755 2.897 3.04 3.184 3.332 3.485 3.645 3.812 3.987 4.17 4.363 4.566 4.778 4.999 5.228 5.463 5.704 5.948 6.194 6.439 6.683 6.922 7.157 7.387 7.609 7.824 8.031 8.228 8.416 8.594 8.76 8.914 9.055 9.182 9.293 9.389 9.468 9.529 9.572 9.595 9.6 9.6 9.593 9.577 9.554 9.523 9.484 9.439 9.387 9.33 9.266 9.197 9.124 9.046 8.963 8.877 8.787 8.693 8.597 8.498 8.397 8.293 8.188 8.081 7.972 7.862 7.752 7.64 7.528 7.415 7.302 7.189 7.076 6.963 6.85 6.737 6.625 6.513 6.402 6.292 6.183 6.074 5.967 5.86 5.754 5.65 5.546 5.444 5.343 5.243 5.145 5.048 4.952 4.857 4.764 4.672 4.582 4.493 4.405 4.318 4.233 4.15 4.067 3.987 3.907 3.829 3.752 3.677 3.602 3.529 3.458 3.388 3.319 3.251 3.185 3.119 3.055 2.992 2.931 2.87 2.811 2.753 2.696 2.64 2.585 2.531 2.479 2.427 2.377 2.327 2.278 2.231 2.184 2.138 2.093 2.049 2.006 1.964 1.923 1.882 1.843 1.804 1.766 1.729 1.692 1.656 1.621 1.587 1.554 1.521 1.488 1.457 1.426 1.396 1.366 1.337 1.309 1.281 1.254 1.227 1.201 1.176 1.151 1.126 1.102 1.079 1.056 1.034 1.012 0.99 0.969 0.948 0.928 0.909 0.889 0.87 0.852

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="2.715" PeakHeight="110.0" Num="3" Error="0.0">
-29.936 12.327 -2.794
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="2.715" EndFrequency="9.6" PeakHeight="323.517" Num="5" zHalfNm="227.192" Error="2.052">
-187.892 -10.584 -1.3 -1.228 1.09
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="13.603" Depth="0.123"/>
<TopsideChapman PeakHeight="323.517" PeakDensity="1143424.4" PeakScaleHeight="72.377" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
