<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-02-23 -054 14:50:00.000"
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" >
2026.02.23 (054) 14:50:00</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">
FF202605402231450009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="25" >
<URSI ID="00" Val="10.000" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.346" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="23.461" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="5.600" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="5.600" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="10.500" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="310.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="310.000" 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="0.700" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="9.200" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="545.000" Name="h`(fMUF)" Units="km" QL="/" DL="/" />
<Modeled Name="foEp" Val="3.396" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="5.600" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="5.600" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<Modeled Name="foF1p" Val="4.363" Units="MHz" ModelName="IRI-90" />
<URSI ID="92" Val="383.336" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="248.420" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="7.454" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="169.076" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="50.654" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="94.122" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="222.940" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.260" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="1">
<Trace Type="standard" Layer="F2" Polarization="O" Num="89">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
310.000 315.000 315.000 320.000 320.000 320.000 325.000 325.000 330.000 330.000 335.000 340.000 340.000 342.500 345.000 350.000 355.000 355.000 360.000 360.000 365.000 370.000 370.000 375.000 375.000 380.000 380.000 385.000 390.000 390.000 395.000 395.000 400.000 405.000 405.000 405.000 410.000 415.000 415.000 420.000 425.000 430.000 430.000 435.000 440.000 445.000 450.000 450.000 455.000 455.000 465.000 470.000 475.000 475.000 485.000 490.000 490.000 495.000 495.000 505.000 510.000 510.000 515.000 520.000 520.000 525.000 530.000 535.000 535.000 540.000 545.000 545.000 545.000 555.000 555.000 560.000 564.146 568.680 573.661 579.157 585.253 592.052 599.685 608.313 618.145 629.452 642.594 658.056 676.512
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
51 48 51 48 51 48 54 51 51 48 0 48 51 0 51 51 45 51 48 54 51 45 51 48 54 51 54 54 48 54 51 54 54 51 57 57 54 57 57 51 57 57 57 57 60 60 60 60 60 60 60 57 57 60 54 48 60 57 57 54 54 57 60 57 57 60 57 51 57 54 48 48 0 57 54 54 54 54 54 51 51 51 51 0 0 0 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 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 -1.171875 1.171875 1.953125 -2.734375 2.734375 2.734375
</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" >
89.483 90.0 95.0 100.0 105.0 110.0 111.527 113.053 114.58 115.0 120.0 125.0 130.0 135.0 140.0 145.0 150.0 155.0 160.0 165.0 170.0 175.0 180.0 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 383.336 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 1000.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.241 2.285 2.939 3.285 3.396 3.273 3.273 3.396 3.41 3.568 3.711 3.846 3.978 4.109 4.24 4.371 4.504 4.637 4.773 4.91 5.048 5.188 5.328 5.469 5.611 5.752 5.893 6.033 6.173 6.311 6.448 6.584 6.718 6.851 6.982 7.112 7.24 7.368 7.494 7.618 7.742 7.864 7.986 8.106 8.226 8.345 8.464 8.581 8.699 8.816 8.932 9.047 9.162 9.276 9.389 9.5 9.608 9.711 9.806 9.889 9.954 9.992 10.0 10.0 9.995 9.985 9.971 9.951 9.926 9.897 9.864 9.827 9.785 9.74 9.691 9.639 9.584 9.526 9.464 9.4 9.334 9.265 9.193 9.12 9.045 8.968 8.889 8.809 8.727 8.644 8.56 8.474 8.388 8.301 8.213 8.125 8.036 7.946 7.856 7.766 7.676 7.585 7.494 7.404 7.313 7.223 7.132 7.042 6.952 6.862 6.773 6.684 6.596 6.508 6.42 6.333 6.247 6.161 6.076 5.992 5.908 5.825 5.742 5.661 5.58 5.5 5.42 5.342 5.264 5.187 5.111 5.035 4.961 4.887 4.814 4.742 4.671 4.601 4.531 4.463 4.395 4.328 4.262 4.197 4.132 4.069 4.006 3.944 3.883 3.823 3.763 3.705 3.647 3.59 3.533 3.478 3.423 3.37 3.316 3.264 3.212 3.162 3.111 3.062 3.013 2.966 2.918 2.872 2.826 2.781 2.736 2.692 2.649 2.607 2.565 2.524 2.483 2.443 2.404 2.365 2.327 2.29 2.253 2.216 2.18 2.145 2.11

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="3.396" PeakHeight="110.0" Num="3" Error="0.0">
-30.504 13.157 -3.17
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="3.396" EndFrequency="10.0" PeakHeight="383.336" Num="5" zHalfNm="248.42" Error="3.391">
-229.405 -61.545 29.369 -10.458 3.283
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="4.58" Depth="0.123"/>
<TopsideChapman PeakHeight="383.336" PeakDensity="1240694.8" PeakScaleHeight="94.122" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
