<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-02-22 -053 20:40:00.000"
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" >
2026.02.22 (053) 20:40:00</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">
FF202605302222040009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="29" >
<URSI ID="00" Val="11.050" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.529" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="27.940" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="2.200" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="30" Val="3.550" Name="foEs" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="3.000" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="11.550" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="270.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="270.000" Name="h`F2" Units="km" QL="/" DL="/" />
<URSI ID="34" Val="110.000" 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="0.200" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="10.700" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="526.223" 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="1.796" 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="394.122" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="312.203" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="8.324" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<Custom Name="fminEs" Val="2.200" Description="Minimum frequency of Es-layer" Units="MHz" />
<URSI ID="94" Val="114.330" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="39.408" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="58.127" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="139.420" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.210" Name="B1" QL="/" DL="/" />
<URSI ID="32" Val="3.000" Name="fbEs" Units="MHz" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="2">
<Trace Type="standard" Layer="F2" Polarization="O" Num="162">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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 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" >
270.000 270.000 270.000 270.000 270.000 275.000 280.000 280.000 280.000 280.000 280.000 280.000 280.000 280.000 280.000 280.000 280.000 280.000 280.000 285.000 290.000 290.000 290.000 290.000 290.000 292.500 295.000 295.000 300.000 305.000 302.500 300.000 300.000 305.000 305.000 305.000 315.000 315.000 312.500 310.000 312.500 315.000 317.500 320.000 325.000 325.000 325.000 327.500 330.000 330.000 330.000 335.000 335.000 335.000 335.000 340.000 341.875 343.750 345.625 347.500 349.375 351.250 353.125 355.000 357.500 360.000 365.000 365.000 367.500 370.000 372.500 375.000 375.000 380.000 380.000 385.000 385.000 390.000 390.000 395.000 395.000 400.000 400.000 405.000 405.000 405.000 408.333 411.667 415.000 420.000 420.000 425.000 425.000 425.000 430.000 435.000 435.000 435.000 437.500 440.000 445.000 445.000 445.000 445.000 445.000 445.000 450.000 450.000 450.000 455.000 455.000 455.000 455.000 455.000 455.000 460.000 460.000 460.000 460.000 460.000 465.000 465.000 465.000 465.000 465.000 470.000 470.000 470.000 470.000 472.500 475.000 475.000 477.500 480.000 482.500 485.000 486.667 488.333 490.000 491.667 493.333 495.000 495.000 500.000 501.667 503.333 505.000 507.500 510.000 515.000 516.692 518.606 520.788 523.300 526.223 529.665 533.779 538.783 545.000 552.933 563.407 577.874
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
54 0 66 66 66 66 51 0 0 0 0 66 0 60 0 0 0 57 54 0 0 0 0 66 63 0 69 69 0 51 0 0 60 66 69 0 51 45 0 63 0 0 0 69 60 66 69 0 66 69 69 63 0 60 0 72 0 0 0 0 0 0 0 69 0 69 66 69 0 0 0 66 66 57 60 57 66 57 66 63 69 63 69 63 69 69 0 0 69 60 69 63 69 69 66 57 66 69 63 72 60 66 69 72 72 66 72 69 72 69 69 69 69 66 63 69 69 66 66 63 66 66 63 63 60 63 66 66 63 0 63 63 0 63 0 60 0 0 0 60 0 57 60 54 0 0 54 45 51 45 51 48 0 48 0 48 51 48 48 0 0 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 1.953125 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -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 -1.953125 -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 2.734375 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -1.171875 -0.390625 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -2.734375 -1.171875 2.734375 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -0.390625 -0.390625 -1.171875 -1.171875 -1.171875 -1.171875 -2.734375 -0.390625 -1.953125
</TraceValueList>
</Trace>
<Trace Type="standard" Layer="Es" Polarization="O" Num="28">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
2.2 2.25 2.3 2.35 2.4 2.45 2.5 2.55 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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
120.000 110.000 120.000 115.000 115.000 117.500 120.000 120.000 117.500 115.000 112.500 110.000 110.000 117.500 125.000 115.000 120.000 120.000 120.000 120.000 120.000 120.000 120.000 120.000 120.000 122.500 125.000 125.000
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
57 60 57 66 63 0 57 57 0 0 0 69 69 0 54 69 63 54 63 66 0 0 0 0 0 0 66 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 -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
</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" >
89.824 90.0 95.0 100.0 105.0 110.0 115.0 119.376 120.0 125.0 128.751 130.0 135.0 138.127 140.0 145.0 150.0 155.0 160.0 165.0 170.0 175.0 180.0 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 394.122 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 1000.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.215 1.202 1.555 1.738 1.796 1.758 1.659 1.659 1.659 1.659 1.677 1.75 1.796 1.831 1.928 2.029 2.135 2.247 2.365 2.491 2.624 2.764 2.913 3.069 3.234 3.405 3.582 3.766 3.954 4.145 4.34 4.536 4.734 4.933 5.132 5.332 5.531 5.73 5.93 6.128 6.327 6.526 6.725 6.924 7.123 7.323 7.523 7.724 7.927 8.131 8.336 8.543 8.751 8.962 9.176 9.392 9.61 9.831 10.053 10.276 10.495 10.703 10.886 11.013 11.05 11.05 11.039 11.014 10.974 10.921 10.856 10.78 10.693 10.596 10.491 10.377 10.256 10.128 9.994 9.856 9.712 9.565 9.414 9.26 9.103 8.945 8.785 8.624 8.462 8.3 8.138 7.976 7.814 7.653 7.493 7.334 7.177 7.021 6.866 6.714 6.563 6.414 6.267 6.123 5.981 5.84 5.703 5.567 5.434 5.304 5.176 5.05 4.927 4.806 4.688 4.572 4.459 4.348 4.239 4.133 4.029 3.927 3.828 3.731 3.636 3.544 3.453 3.365 3.279 3.195 3.112 3.032 2.954 2.878 2.803 2.731 2.66 2.591 2.523 2.458 2.394 2.331 2.27 2.211 2.153 2.097 2.042 1.989 1.937 1.886 1.836 1.788 1.741 1.695 1.651 1.607 1.565 1.524 1.484 1.444 1.406 1.369 1.333 1.298 1.264 1.23 1.198 1.166 1.135 1.105 1.076 1.048 1.02 0.993 0.967 0.941 0.916 0.892 0.869 0.846 0.823 0.801 0.78 0.76 0.739 0.72 0.701

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="1.796" PeakHeight="110.0" Num="3" Error="0.0">
-28.727 10.665 -2.114
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="1.796" EndFrequency="11.05" PeakHeight="394.122" Num="5" zHalfNm="312.203" Error="3.425">
-207.905 -67.435 29.811 -13.161 2.695
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="28.127" Depth="0.137"/>
<TopsideChapman PeakHeight="394.122" PeakDensity="1514919.4" PeakScaleHeight="58.127" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
