<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-02-21 -052 15:00:00.000"
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: One of F2 cusps was derived from the other</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" >
2026.02.21 (052) 15:00:00</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">
FF202605202211500009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="26" >
<URSI ID="00" Val="10.100" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.504" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="25.286" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="5.300" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="5.300" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="10.400" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="290.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="290.000" Name="h`F2" 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="0.250" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="9.450" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="505.000" 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="3.397" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="5.300" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="5.300" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<Modeled Name="foF1p" Val="4.363" Units="MHz" ModelName="IRI-90" />
<URSI ID="92" Val="357.773" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="249.810" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="7.493" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="134.679" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="42.919" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="77.089" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="188.590" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.150" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="1">
<Trace Type="standard" Layer="F2" Polarization="O" Num="97">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
290.000 300.000 305.000 310.000 315.000 322.500 330.000 337.500 345.000 350.000 350.000 350.000 350.000 350.000 355.000 355.000 355.000 355.000 355.000 355.000 355.000 355.000 360.000 360.000 360.000 360.000 365.000 365.000 365.000 365.000 365.000 370.000 370.000 370.000 375.000 375.000 375.000 380.000 380.000 380.000 385.000 385.000 390.000 390.000 395.000 395.000 395.000 400.000 400.000 405.000 410.000 415.000 415.000 420.000 420.000 425.000 425.000 430.000 430.000 435.000 440.000 440.000 445.000 445.000 450.000 450.000 455.000 460.000 460.000 465.000 470.000 475.000 480.000 480.000 485.000 485.000 485.000 490.000 490.000 495.000 500.000 505.000 505.000 505.000 515.000 515.000 520.000 525.000 529.288 534.075 539.453 545.539 552.482 560.477 569.783 580.752 593.871
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
45 45 45 48 48 48 48 0 51 54 0 57 54 54 54 0 54 57 57 57 57 57 54 57 57 60 60 60 63 63 60 63 63 63 60 63 60 60 63 63 60 63 57 60 60 60 60 63 60 63 54 45 57 48 60 54 60 57 63 60 54 60 57 60 60 60 60 60 57 57 60 57 45 57 48 57 60 57 57 60 57 51 60 60 57 57 57 57 54 54 54 54 51 51 51 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 -0.390625 0.390625 0.390625 0.390625 -0.390625 0.390625 0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 0.390625 -0.390625 0.390625 0.390625 -0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 -0.390625 -0.390625 0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 0.390625 -0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 -0.390625 0.390625 -0.390625 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
</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" >
89.482 90.0 95.0 100.0 105.0 110.0 111.521 113.043 114.564 115.0 120.0 125.0 130.0 135.0 140.0 145.0 150.0 155.0 160.0 165.0 170.0 175.0 180.0 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 357.773 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 1000.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.241 2.285 2.94 3.286 3.397 3.274 3.274 3.397 3.413 3.581 3.727 3.864 3.995 4.123 4.25 4.376 4.502 4.629 4.757 4.886 5.016 5.148 5.282 5.417 5.554 5.693 5.833 5.975 6.118 6.262 6.407 6.554 6.701 6.849 6.998 7.147 7.297 7.448 7.598 7.75 7.901 8.053 8.205 8.357 8.51 8.662 8.815 8.968 9.12 9.271 9.421 9.567 9.708 9.838 9.953 10.042 10.092 10.1 10.099 10.092 10.076 10.053 10.023 9.986 9.943 9.894 9.839 9.778 9.713 9.642 9.568 9.489 9.406 9.32 9.23 9.138 9.043 8.945 8.845 8.743 8.639 8.534 8.427 8.319 8.21 8.1 7.99 7.879 7.767 7.655 7.544 7.432 7.32 7.209 7.097 6.987 6.876 6.766 6.657 6.549 6.441 6.335 6.229 6.124 6.02 5.917 5.815 5.714 5.615 5.516 5.419 5.323 5.228 5.134 5.042 4.95 4.861 4.772 4.684 4.598 4.513 4.43 4.348 4.267 4.187 4.108 4.031 3.955 3.88 3.807 3.735 3.664 3.594 3.525 3.457 3.391 3.326 3.262 3.199 3.137 3.076 3.017 2.958 2.901 2.844 2.789 2.735 2.681 2.629 2.577 2.527 2.477 2.429 2.381 2.334 2.288 2.243 2.199 2.156 2.113 2.071 2.03 1.99 1.951 1.912 1.874 1.837 1.801 1.765 1.73 1.696 1.662 1.629 1.597 1.565 1.534 1.503 1.473 1.444 1.415 1.387 1.359 1.332 1.306 1.28 1.254 1.229

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="3.397" PeakHeight="110.0" Num="3" Error="0.0">
-30.505 13.158 -3.171
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="3.397" EndFrequency="10.1" PeakHeight="357.773" Num="5" zHalfNm="249.81" Error="4.854">
-196.407 -65.156 20.516 -4.251 2.089
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="4.564" Depth="0.123"/>
<TopsideChapman PeakHeight="357.773" PeakDensity="1265632.8" PeakScaleHeight="77.089" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
