<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-02-18 -049 16:00:00.000"
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" >
2026.02.18 (049) 16:00:00</StartTime>
<SolarTerrestrialData>
<GyroFrequency Val="0.63" Model="IGRF 3.0" Altitude="300"/>
<DipAngle Val="-11.14" 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">
FF202604902181600009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="25" >
<URSI ID="00" Val="9.250" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.407" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="22.267" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="5.450" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="5.450" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="9.550" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="320.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="320.000" 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="0.150" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="7.750" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="450.000" Name="h`(fMUF)" Units="km" QL="/" DL="/" />
<Modeled Name="foEp" Val="3.370" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="5.450" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="5.450" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<Modeled Name="foF1p" Val="4.351" Units="MHz" ModelName="IRI-90" />
<URSI ID="92" Val="382.562" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="237.659" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="7.748" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="185.542" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="47.139" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="103.767" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="228.430" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.490" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="1">
<Trace Type="standard" Layer="F2" Polarization="O" Num="77">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
320.000 325.000 328.333 331.667 335.000 335.000 340.000 340.000 345.000 345.000 350.000 350.000 352.500 355.000 357.500 360.000 362.500 365.000 370.000 375.000 380.000 380.000 385.000 385.000 385.000 390.000 390.000 395.000 395.000 400.000 405.000 405.000 410.000 410.000 415.000 420.000 420.000 425.000 425.000 430.000 435.000 435.000 440.000 440.000 445.000 450.000 450.000 460.000 465.000 465.000 470.000 480.000 485.000 490.000 495.000 505.000 510.000 520.000 525.000 530.000 545.000 545.000 550.000 560.000 565.000 570.895 577.407 584.639 592.716 601.797 612.081 623.824 637.359 653.132 671.746 694.047 721.250
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
45 48 0 0 48 51 48 51 48 51 51 51 0 0 0 51 0 0 54 54 45 54 48 54 57 57 57 57 60 57 51 60 54 57 54 48 57 51 60 57 51 60 60 60 60 60 60 60 60 60 60 60 60 60 60 60 57 60 57 54 45 57 54 57 57 54 57 57 57 57 54 51 54 48 51 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 -0.390625 0.390625 0.390625 0.390625 -0.390625 0.390625 0.390625 -0.390625 0.390625 -0.390625 0.390625 0.390625 -0.390625 0.390625 0.390625 -0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 -0.390625 0.390625 -0.390625 0.390625 -0.390625 0.390625 0.390625 -0.390625 -0.390625 0.390625 0.390625 -0.390625 -0.390625 0.390625 0.390625 -0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 -0.390625 0.390625 0.390625 -0.390625 0.390625 -0.390625 -0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 -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" >
89.487 90.0 95.0 100.0 105.0 110.0 111.633 113.267 114.9 115.0 120.0 125.0 130.0 135.0 140.0 145.0 150.0 155.0 160.0 165.0 170.0 175.0 180.0 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 382.562 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 1000.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.24 2.267 2.916 3.26 3.37 3.247 3.247 3.37 3.373 3.518 3.649 3.774 3.895 4.015 4.135 4.256 4.378 4.501 4.626 4.753 4.882 5.012 5.144 5.277 5.411 5.546 5.68 5.814 5.948 6.081 6.213 6.343 6.473 6.6 6.726 6.851 6.973 7.094 7.214 7.331 7.447 7.562 7.674 7.786 7.895 8.003 8.11 8.214 8.317 8.418 8.516 8.612 8.705 8.795 8.88 8.96 9.034 9.1 9.156 9.201 9.232 9.248 9.25 9.25 9.245 9.237 9.225 9.21 9.19 9.168 9.141 9.112 9.08 9.044 9.006 8.965 8.921 8.875 8.827 8.776 8.723 8.669 8.612 8.554 8.493 8.432 8.369 8.304 8.238 8.171 8.103 8.034 7.964 7.893 7.821 7.748 7.675 7.601 7.527 7.453 7.378 7.302 7.227 7.151 7.075 6.999 6.923 6.847 6.771 6.695 6.619 6.543 6.468 6.392 6.317 6.242 6.168 6.094 6.02 5.947 5.874 5.801 5.729 5.657 5.586 5.515 5.445 5.376 5.307 5.238 5.17 5.103 5.036 4.97 4.904 4.839 4.775 4.711 4.648 4.586 4.524 4.463 4.402 4.342 4.283 4.224 4.166 4.109 4.052 3.996 3.941 3.886 3.832 3.778 3.726 3.673 3.622 3.571 3.521 3.471 3.422 3.373 3.325 3.278 3.231 3.185 3.14 3.095 3.051 3.007 2.964 2.921 2.879 2.838 2.797 2.756 2.717 2.677 2.638 2.6 2.563 2.525 2.489 2.452 2.417 2.382 2.347

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="3.37" PeakHeight="110.0" Num="3" Error="0.0">
-30.486 13.13 -3.157
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="3.37" EndFrequency="9.25" PeakHeight="382.562" Num="5" zHalfNm="237.659" Error="5.279">
-240.31 -41.619 18.674 -7.189 2.782
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="4.9" Depth="0.123"/>
<TopsideChapman PeakHeight="382.562" PeakDensity="1061569.5" PeakScaleHeight="103.767" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
