<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-02-23 -054 20:10:00.000"
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="1 2 0 0 0 0 0 0 0 22 0 0 0 0 0 0 0 0 0 0 "/>
<Comments>AR.5002.44 Confidence: 85% PACIFIC flags: Multiple candidates for F2o cusp, 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) 20:10:00</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">
FF202605402232010009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="28" >
<URSI ID="00" Val="10.350" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.608" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="26.992" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="1.950" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="3.200" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="81" Val="1.950" Name="fminE" Units="MHz" QL="/" DL="/" />
<URSI ID="20" Val="2.110" Name="foE" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="10.650" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="245.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="245.000" Name="h`F2" Units="km" QL="/" DL="/" />
<URSI ID="24" Val="114.217" Name="h`E" Units="km" QL="/" DL="/" />
<URSI ID="90" Val="101.520" Name="hmE" Units="km" QL="/" DL="/" />
<URSI ID="83" Val="11.368" Name="yE" Units="km" QL="/" DL="/" />
<URSI ID="86" Val="0.250" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="9.900" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="491.923" 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="2.203" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="3.200" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="3.200" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="356.939" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="269.093" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="8.441" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="119.545" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="36.500" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="62.406" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="140.210" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.380" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="2">
<Trace Type="standard" Layer="F2" Polarization="O" Num="144">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
3.2 3.25 3.3 3.35 3.4 3.45 3.5 3.55 3.6 3.65 3.7 3.75 3.8 3.85 3.9 3.95 4.0 4.05 4.1 4.15 4.2 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 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 10.15 10.2 10.25 10.3 10.35
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
245.000 245.000 245.000 245.000 250.000 250.000 250.000 255.000 255.000 255.000 257.500 260.000 261.500 263.000 264.500 266.000 267.500 269.000 270.500 272.000 273.500 275.000 276.667 278.333 280.000 280.000 280.000 280.000 280.000 281.667 283.333 285.000 285.000 287.500 290.000 293.333 296.667 300.000 300.000 300.000 301.667 303.333 305.000 305.000 305.000 305.000 305.000 305.000 310.000 310.000 310.000 310.000 315.000 315.000 315.000 316.250 317.500 318.750 320.000 325.000 325.000 330.000 332.500 335.000 335.000 335.000 335.000 337.500 340.000 345.000 345.000 345.000 345.000 347.500 350.000 355.000 355.000 355.000 355.000 360.000 360.000 360.000 365.000 365.000 370.000 370.000 370.000 375.000 375.000 380.000 380.000 385.000 385.000 385.000 390.000 395.000 395.000 400.000 400.000 400.000 405.000 410.000 410.000 410.000 415.000 420.000 420.000 425.000 425.000 430.000 430.000 435.000 435.000 440.000 440.000 445.000 445.000 445.000 450.000 450.000 450.000 450.000 450.000 452.500 455.000 458.333 461.667 465.000 468.846 472.692 476.538 480.385 484.231 488.077 491.923 495.769 499.615 505.388 511.681 518.567 526.134 534.489 543.761 554.111
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
54 57 60 60 54 60 63 63 0 66 0 60 0 0 0 54 0 0 0 0 0 63 0 0 63 66 63 60 57 0 0 60 57 0 63 0 0 54 0 63 0 0 0 63 0 66 0 60 69 0 0 60 69 0 66 0 69 0 63 69 66 63 48 57 63 66 69 0 66 54 0 69 69 63 69 57 63 69 69 66 69 69 69 69 63 69 69 69 72 66 72 63 69 69 69 63 69 60 69 69 69 60 66 66 66 57 63 54 63 54 63 51 63 51 60 51 60 66 60 63 63 63 0 63 57 0 0 57 0 60 0 0 57 57 48 0 51 51 51 51 51 51 42 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 -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 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 -0.390625 -0.390625 0.390625 -0.390625 0.390625 -0.390625 0.390625 0.390625 -0.390625 0.390625 -0.390625 -0.390625 -0.390625 -0.390625 0.390625 -0.390625 0.390625 -0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 -0.390625 2.734375 -0.390625 -1.953125 2.734375 -0.390625 0.390625 -0.390625 -0.390625 -0.390625 -0.390625 0.390625 0.390625 -0.390625 -0.390625 -0.390625 -2.734375
</TraceValueList>
</Trace>
<Trace Type="standard" Layer="E" Polarization="O" Num="4">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
1.95 2.0 2.05 2.1
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
114.217 114.991 115.860 116.848
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
51 0 0 51
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
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" >
90.0 95.0 100.0 101.52 105.0 108.632 110.0 115.0 115.744 120.0 122.856 125.0 130.0 135.0 140.0 145.0 150.0 155.0 160.0 165.0 170.0 175.0 180.0 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 356.939 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 1000.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 1.731 2.091 2.11 2.081 1.987 1.987 1.987 1.987 2.061 2.11 2.162 2.281 2.397 2.514 2.633 2.756 2.885 3.019 3.16 3.31 3.467 3.634 3.81 3.995 4.189 4.39 4.597 4.809 5.025 5.242 5.46 5.677 5.894 6.109 6.322 6.532 6.741 6.948 7.152 7.355 7.556 7.756 7.955 8.152 8.349 8.544 8.739 8.934 9.127 9.318 9.508 9.692 9.87 10.036 10.179 10.288 10.345 10.35 10.348 10.334 10.308 10.271 10.223 10.165 10.098 10.023 9.939 9.849 9.751 9.648 9.538 9.424 9.305 9.183 9.056 8.927 8.794 8.66 8.523 8.385 8.246 8.105 7.964 7.823 7.681 7.54 7.399 7.258 7.118 6.978 6.84 6.703 6.567 6.432 6.299 6.167 6.037 5.909 5.782 5.657 5.534 5.413 5.293 5.176 5.061 4.947 4.836 4.726 4.619 4.513 4.41 4.308 4.209 4.111 4.016 3.922 3.83 3.74 3.652 3.566 3.482 3.399 3.319 3.24 3.163 3.087 3.013 2.941 2.87 2.801 2.734 2.668 2.604 2.541 2.479 2.419 2.361 2.303 2.247 2.193 2.14 2.087 2.037 1.987 1.938 1.891 1.845 1.8 1.756 1.713 1.671 1.63 1.59 1.551 1.513 1.476 1.44 1.404 1.37 1.336 1.303 1.271 1.24 1.209 1.18 1.151 1.122 1.095 1.068 1.041 1.016 0.991 0.966 0.943 0.919 0.897 0.875 0.853 0.832 0.811 0.791 0.772 0.753 0.734 0.716 0.698 0.681

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="2.11" PeakHeight="101.52" Num="3" Error="5.43">
-16.613 6.443 -1.35
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="2.11" EndFrequency="10.35" PeakHeight="356.939" Num="5" zHalfNm="269.093" Error="4.886">
-196.155 -50.7 19.919 -10.901 3.754
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="21.336" Depth="0.123"/>
<TopsideChapman PeakHeight="356.939" PeakDensity="1329063.2" PeakScaleHeight="62.406" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
