<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-02-22 -053 12:20:00.000"
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: 90% PACIFIC flags: Multiple candidates for F2x cusp, Multiple candidates for F2o cusp</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) 12:20:00</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">
FF202605302221220009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="28" >
<URSI ID="00" Val="10.200" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.742" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="27.968" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="3.800" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="30" Val="4.400" Name="foEs" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="4.700" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="10.600" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="255.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="255.000" Name="h`F2" Units="km" QL="/" DL="/" />
<URSI ID="34" Val="125.000" 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="0.150" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="9.800" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="455.000" Name="h`(fMUF)" Units="km" QL="/" DL="/" />
<Modeled Name="foEp" Val="3.078" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="4.700" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="4.700" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<Modeled Name="foF1p" Val="4.212" Units="MHz" ModelName="IRI-90" />
<URSI ID="92" Val="329.328" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="239.621" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="7.076" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<Custom Name="fminEs" Val="3.800" Description="Minimum frequency of Es-layer" Units="MHz" />
<URSI ID="94" Val="117.523" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="37.411" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="66.195" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="150.490" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.330" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="2">
<Trace Type="standard" Layer="F2" Polarization="O" Num="111">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
255.000 260.000 265.000 265.000 268.333 271.667 275.000 280.000 280.000 285.000 285.000 285.000 285.000 290.000 292.500 295.000 295.000 295.000 295.000 295.000 295.000 300.000 300.000 300.000 305.000 305.000 305.000 305.000 310.000 310.000 310.000 310.000 310.000 315.000 316.250 317.500 318.750 320.000 325.000 325.000 325.000 325.000 330.000 335.000 335.000 335.000 335.000 340.000 340.000 340.000 345.000 345.000 350.000 350.000 355.000 355.000 360.000 360.000 360.000 365.000 365.000 365.000 370.000 370.000 375.000 375.000 375.000 380.000 380.000 380.000 385.000 385.000 385.000 390.000 390.000 390.000 395.000 400.000 400.000 400.000 400.000 405.000 405.000 410.000 410.000 410.000 412.500 415.000 420.000 420.000 420.000 422.500 425.000 430.000 430.000 435.000 435.000 440.000 445.000 445.000 450.000 455.000 455.000 460.168 466.346 473.859 483.195 495.107 510.833 532.553 564.503
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
48 48 54 51 0 0 51 57 60 60 60 0 54 60 51 57 57 60 0 0 54 57 54 57 57 57 0 63 60 0 60 60 60 63 0 0 0 63 63 0 0 60 0 54 60 66 63 60 63 63 63 63 57 63 54 60 48 54 54 48 57 63 54 60 51 57 63 54 60 63 60 63 63 60 66 63 63 54 60 66 66 63 66 60 63 63 57 63 57 60 63 57 63 57 63 57 63 60 57 63 63 60 60 57 60 57 54 54 51 48 48
</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 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 -0.390625 0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -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>
<Trace Type="standard" Layer="Es" Polarization="O" Num="13">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
135.000 135.000 135.000 130.000 130.000 130.000 130.000 125.000 125.000 125.000 125.000 125.000 125.000
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
51 51 51 51 0 0 51 60 57 63 0 66 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
</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" >
89.532 90.0 95.0 100.0 105.0 110.0 112.873 115.0 115.746 118.619 120.0 125.0 130.0 135.0 140.0 145.0 150.0 155.0 160.0 165.0 170.0 175.0 180.0 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 329.328 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 1000.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.238 2.069 2.664 2.978 3.078 2.956 2.956 2.956 3.078 3.126 3.291 3.45 3.605 3.758 3.91 4.063 4.218 4.373 4.531 4.691 4.854 5.019 5.187 5.359 5.533 5.71 5.89 6.073 6.258 6.447 6.639 6.833 7.029 7.228 7.428 7.631 7.835 8.04 8.245 8.45 8.655 8.858 9.057 9.251 9.438 9.615 9.778 9.922 10.041 10.131 10.185 10.2 10.2 10.193 10.175 10.147 10.109 10.063 10.007 9.944 9.873 9.795 9.711 9.621 9.526 9.425 9.32 9.211 9.098 8.982 8.863 8.742 8.618 8.492 8.365 8.236 8.107 7.976 7.845 7.714 7.582 7.451 7.319 7.189 7.058 6.929 6.8 6.672 6.545 6.419 6.294 6.171 6.049 5.928 5.809 5.691 5.575 5.461 5.348 5.237 5.128 5.02 4.914 4.81 4.707 4.607 4.508 4.41 4.315 4.221 4.129 4.039 3.95 3.863 3.778 3.694 3.612 3.532 3.453 3.376 3.3 3.226 3.154 3.083 3.013 2.945 2.879 2.814 2.75 2.687 2.626 2.566 2.508 2.451 2.395 2.34 2.286 2.234 2.183 2.133 2.084 2.036 1.989 1.943 1.899 1.855 1.812 1.77 1.73 1.69 1.651 1.612 1.575 1.539 1.503 1.468 1.434 1.401 1.369 1.337 1.306 1.276 1.246 1.217 1.189 1.161 1.134 1.108 1.082 1.057 1.033 1.009 0.985 0.962 0.94 0.918 0.897 0.876 0.855 0.835 0.816 0.797 0.778 0.76 0.743 0.725 0.708

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="3.078" PeakHeight="110.0" Num="3" Error="0.0">
-30.26 12.797 -3.005
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="3.078" EndFrequency="10.2" PeakHeight="329.328" Num="5" zHalfNm="239.621" Error="1.847">
-177.505 -43.224 10.239 -0.83 0.611
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="8.619" Depth="0.122"/>
<TopsideChapman PeakHeight="329.328" PeakDensity="1290818.9" PeakScaleHeight="66.195" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
