<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-02-23 -054 15:30:00.000"
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) 15:30:00</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">
FF202605402231530009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="26" >
<URSI ID="00" Val="10.050" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.402" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="24.140" 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="10.350" 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="0.200" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="9.300" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="530.000" 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="3.396" 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="4.363" Units="MHz" ModelName="IRI-90" />
<URSI ID="92" Val="374.280" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="248.364" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="7.611" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="158.682" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="48.463" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="88.960" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="208.970" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.270" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="1">
<Trace Type="standard" Layer="F2" Polarization="O" Num="93">
<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 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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
310.000 315.000 318.000 321.000 324.000 327.000 330.000 335.000 337.500 340.000 345.000 345.000 345.000 350.000 350.000 350.000 350.000 352.500 355.000 360.000 361.667 363.333 365.000 365.000 370.000 370.000 370.000 375.000 380.000 380.000 380.000 380.000 385.000 385.000 385.000 390.000 390.000 395.000 395.000 400.000 400.000 405.000 405.000 410.000 410.000 415.000 420.000 420.000 425.000 425.000 430.000 435.000 435.000 440.000 440.000 445.000 445.000 455.000 455.000 460.000 465.000 465.000 475.000 475.000 480.000 485.000 490.000 490.000 500.000 505.000 505.000 510.000 510.000 520.000 525.000 525.000 530.000 530.000 545.000 550.000 550.000 555.000 560.000 570.000 575.000 580.895 587.407 594.639 602.716 611.797 622.081 633.824 647.359
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
48 45 0 0 45 0 48 51 0 51 48 0 54 45 54 54 51 0 51 54 0 0 57 57 57 60 60 0 51 60 63 63 60 63 63 63 66 63 66 63 66 60 66 63 66 63 57 66 60 66 63 57 63 63 63 66 66 63 60 63 63 63 63 60 60 60 60 60 60 54 60 60 57 54 51 60 60 57 45 45 57 54 51 54 54 54 54 54 48 51 48 0 45
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
-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 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 0.390625 -0.390625 0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 -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" >
89.483 90.0 95.0 100.0 105.0 110.0 111.526 113.051 114.577 115.0 120.0 125.0 130.0 135.0 140.0 145.0 150.0 155.0 160.0 165.0 170.0 175.0 180.0 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 374.28 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 1000.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.241 2.285 2.939 3.285 3.396 3.273 3.273 3.396 3.412 3.575 3.719 3.854 3.985 4.113 4.241 4.368 4.497 4.627 4.758 4.892 5.027 5.164 5.303 5.443 5.584 5.727 5.87 6.014 6.158 6.301 6.445 6.588 6.73 6.872 7.012 7.152 7.291 7.428 7.565 7.7 7.835 7.968 8.101 8.233 8.364 8.494 8.624 8.753 8.88 9.008 9.134 9.258 9.381 9.501 9.618 9.729 9.832 9.922 9.993 10.037 10.05 10.05 10.046 10.036 10.02 9.999 9.973 9.942 9.905 9.864 9.819 9.77 9.716 9.659 9.599 9.535 9.467 9.397 9.325 9.249 9.172 9.092 9.01 8.926 8.84 8.753 8.664 8.575 8.483 8.391 8.298 8.205 8.11 8.015 7.92 7.824 7.728 7.631 7.535 7.439 7.342 7.246 7.15 7.054 6.958 6.863 6.768 6.674 6.58 6.487 6.394 6.302 6.211 6.12 6.031 5.941 5.853 5.765 5.679 5.593 5.508 5.424 5.34 5.258 5.176 5.096 5.016 4.937 4.86 4.783 4.707 4.632 4.558 4.485 4.413 4.342 4.272 4.203 4.134 4.067 4.001 3.935 3.871 3.807 3.744 3.683 3.622 3.562 3.503 3.445 3.387 3.331 3.275 3.22 3.166 3.113 3.061 3.01 2.959 2.909 2.86 2.812 2.764 2.717 2.671 2.626 2.582 2.538 2.495 2.452 2.41 2.369 2.329 2.289 2.25 2.211 2.174 2.136 2.1 2.064 2.029 1.994 1.96 1.926 1.893 1.86 1.828

</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="10.05" PeakHeight="374.28" Num="5" zHalfNm="248.364" Error="5.131">
-219.576 -59.554 24.262 -7.899 3.064
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="4.577" Depth="0.123"/>
<TopsideChapman PeakHeight="374.28" PeakDensity="1253132.8" PeakScaleHeight="88.96" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
