<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-02-24 -055 22:50:00.000"
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 44 0 0 0 0 0 0 0 0 1 0 "/>
<Comments>AR.5002.44 Confidence: 40% PACIFIC flags: F2o cusp not found, Multiple candidates for F2x cusp, Multiple candidates for F2o cusp, One of F2 cusps was derived from the other, Unidentified traces above foF2</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" >
2026.02.24 (055) 22:50:00</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">
FF202605502242250009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="25" >
<URSI ID="00" Val="8.050" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.449" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="19.713" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="4.250" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="4.250" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="8.800" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="425.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="425.000" 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="1.200" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="8.000" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="575.000" 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="0.354" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="4.250" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="4.250" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="462.171" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="394.208" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="7.533" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="102.100" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="17.668" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="50.073" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="111.520" 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" >
4.25 4.3 4.35 4.4 4.45 4.5 4.55 4.6 4.65 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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
425.000 425.000 425.000 435.000 430.000 431.667 433.333 435.000 435.000 435.000 440.000 440.000 440.000 440.000 441.000 442.000 443.000 444.000 445.000 450.000 450.000 445.000 445.000 435.000 445.000 445.000 455.000 455.000 455.000 455.000 460.000 460.000 470.000 470.000 470.000 475.000 475.000 475.000 475.000 475.000 480.000 485.000 490.000 490.000 490.000 490.000 500.000 500.000 502.500 505.000 505.000 535.000 535.000 535.000 540.000 542.500 545.000 547.500 550.000 540.000 545.000 550.000 555.000 557.500 560.000 560.000 560.000 560.000 560.000 562.500 565.000 565.000 565.000 580.000 595.000 575.000 605.396
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
69 0 75 63 63 0 0 63 60 69 66 60 63 60 0 66 51 0 0 66 69 63 60 63 63 63 66 66 63 75 63 66 69 60 72 66 60 0 72 69 69 69 63 69 66 66 63 57 0 63 63 66 60 63 63 0 60 0 54 66 0 0 60 0 60 54 63 63 60 60 63 57 60 60 63 66 48
</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 1.171875 -0.390625 -0.390625 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -0.390625 -1.171875 -1.171875 -2.734375 0.390625 -1.171875 -1.953125 -1.171875 -1.953125 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 1.171875 1.171875 -1.171875 -1.171875 -1.171875 -1.171875
</TraceValueList>
</Trace>
</TraceList>
<ProfileList Num="1">
<Profile  Algorithm="NH" AlgorithmVersion="4.33" Type="vertical" >
<Tabulated Num="187">
<AltitudeList Type="float" Units="km" Description="Altitude above station level" >
93.502 95.0 100.0 105.0 110.0 115.0 120.0 125.0 130.0 135.0 140.0 143.144 145.0 150.0 155.0 160.0 165.0 170.0 175.0 176.288 180.0 185.0 190.0 195.0 200.0 205.0 209.432 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 462.171 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 1000.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.234 0.307 0.343 0.354 0.351 0.343 0.328 0.307 0.277 0.235 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.217 0.24 0.264 0.287 0.31 0.333 0.354 0.361 0.423 0.485 0.549 0.619 0.694 0.776 0.865 0.962 1.067 1.179 1.299 1.426 1.558 1.697 1.84 1.987 2.138 2.292 2.45 2.61 2.773 2.938 3.106 3.277 3.45 3.625 3.803 3.983 4.166 4.351 4.539 4.73 4.923 5.119 5.318 5.52 5.725 5.932 6.141 6.352 6.564 6.777 6.988 7.195 7.395 7.582 7.751 7.891 7.993 8.045 8.05 8.048 8.031 8.001 7.958 7.902 7.836 7.759 7.673 7.579 7.478 7.37 7.256 7.137 7.014 6.887 6.758 6.626 6.491 6.356 6.219 6.082 5.945 5.808 5.671 5.535 5.401 5.267 5.135 5.004 4.875 4.748 4.623 4.499 4.379 4.26 4.143 4.029 3.918 3.808 3.701 3.597 3.495 3.395 3.298 3.203 3.11 3.02 2.932 2.846 2.763 2.682 2.603 2.526 2.451 2.378 2.308 2.239 2.172 2.107 2.044 1.982 1.923 1.865 1.809 1.754 1.701 1.65 1.6 1.551 1.504 1.459 1.414 1.371 1.33 1.289 1.25 1.212 1.175 1.139 1.104 1.071 1.038 1.006 0.976 0.946 0.917 0.889 0.862 0.835 0.81 0.785 0.761 0.738 0.715 0.693 0.672 0.651 0.631 0.612 0.593 0.575 0.557 0.54 0.524 0.508 0.492 0.477 0.462

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="0.354" PeakHeight="110.0" Num="3" Error="0.0">
-18.791 2.435 -0.142
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="0.354" EndFrequency="8.05" PeakHeight="462.171" Num="5" zHalfNm="394.208" Error="4.105">
-232.734 -40.05 28.728 -12.091 3.408
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="99.432" Depth="0.154"/>
<TopsideChapman PeakHeight="462.171" PeakDensity="804001.25" PeakScaleHeight="50.073" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
