<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-02-24 -055 19:50:00.000"
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="1 2 0 0 0 0 0 0 0 11 0 0 0 0 0 0 0 0 0 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" >
2026.02.24 (055) 19:50:00</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">
FF202605502241950009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="32" >
<URSI ID="00" Val="10.600" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.441" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="25.874" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="2.200" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="30" Val="4.900" Name="foEs" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="4.500" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="81" Val="2.200" Name="fminE" Units="MHz" QL="/" DL="/" />
<URSI ID="20" Val="2.510" Name="foE" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="10.900" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="275.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="275.000" Name="h`F2" Units="km" QL="/" DL="/" />
<URSI ID="24" Val="95.513" Name="h`E" Units="km" QL="/" DL="/" />
<URSI ID="34" Val="100.000" Name="h`Es" Units="km" QL="/" DL="/" />
<URSI ID="90" Val="94.950" Name="hmE" Units="km" QL="/" DL="/" />
<URSI ID="83" Val="4.863" Name="yE" Units="km" QL="/" DL="/" />
<URSI ID="86" Val="0.100" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="9.550" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="495.000" 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="2.405" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="4.500" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="4.500" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="389.515" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="266.488" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="8.508" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<Custom Name="fminEs" Val="2.550" Description="Minimum frequency of Es-layer" Units="MHz" />
<URSI ID="94" Val="167.919" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="54.024" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="90.098" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="189.550" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.610" Name="B1" QL="/" DL="/" />
<URSI ID="32" Val="4.500" Name="fbEs" Units="MHz" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="3">
<Trace Type="standard" Layer="F2" Polarization="O" Num="123">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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 10.4 10.45 10.5 10.55 10.6
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
275.000 275.000 277.500 280.000 280.000 280.000 282.500 285.000 287.500 290.000 292.500 295.000 297.500 300.000 300.000 300.000 300.000 300.000 305.000 310.000 310.000 310.000 310.000 310.000 315.000 315.000 317.000 319.000 321.000 323.000 325.000 330.000 330.000 330.000 332.000 334.000 336.000 338.000 340.000 340.000 342.500 345.000 345.000 350.000 350.000 350.000 355.000 355.000 360.000 360.000 360.000 365.000 370.000 370.000 370.000 375.000 375.000 380.000 380.000 385.000 385.000 390.000 390.000 395.000 395.000 400.000 400.000 400.000 405.000 410.000 415.000 415.000 415.000 420.000 420.000 425.000 430.000 430.000 430.000 435.000 435.000 440.000 440.000 445.000 445.000 450.000 450.000 455.000 455.000 460.000 455.000 465.000 460.000 465.000 470.000 475.000 480.000 485.000 485.000 490.000 495.000 495.000 500.000 505.000 510.000 515.000 520.000 525.000 530.000 535.000 540.000 547.500 555.000 562.500 570.000 580.000 590.000 602.951 617.720 634.719 654.493 677.784 705.619
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
63 60 0 72 72 69 0 0 0 0 0 0 0 54 63 63 63 63 69 51 0 0 57 0 63 66 0 0 0 0 63 54 63 60 0 0 0 0 60 66 0 54 57 63 69 69 66 63 63 72 72 69 60 57 72 66 72 63 69 66 72 69 75 66 75 63 72 63 75 63 57 60 69 69 75 72 69 72 78 69 72 72 75 75 75 75 78 75 72 72 0 0 0 0 63 0 57 48 66 63 60 69 63 0 0 0 0 0 54 51 51 0 45 0 51 45 57 45 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 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 0.390625 -0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 -0.390625 -0.390625 -0.390625 0.390625 -0.390625 0.390625 -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 0.390625 0.390625 0.390625 0.390625 -1.171875 0.390625 0.390625 0.390625 -2.734375 -0.390625 -0.390625 1.171875 -1.953125 1.953125
</TraceValueList>
</Trace>
<Trace Type="standard" Layer="E" Polarization="O" Num="7">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
2.2 2.25 2.3 2.35 2.4 2.45 2.5
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
95.513 96.375 97.355 98.493 99.856 101.568 103.903
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
66 63 0 0 0 63 57
</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
</TraceValueList>
</Trace>
<Trace Type="standard" Layer="Es" Polarization="O" Num="48">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
2.55 2.6 2.65 2.7 2.75 2.8 2.85 2.9 2.95 3.0 3.05 3.1 3.15 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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
100.000 100.000 100.000 100.000 100.000 100.000 100.000 100.000 100.000 100.000 100.000 100.000 100.000 100.000 100.000 100.000 100.000 100.000 100.000 100.000 100.000 100.000 100.000 100.000 100.000 100.000 100.000 100.000 100.000 100.000 100.000 100.000 100.000 100.000 100.000 100.000 100.000 100.000 100.000 100.000 100.000 100.000 100.000 100.000 100.000 100.000 100.000 105.000
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
69 69 0 0 0 0 0 0 72 69 0 72 72 0 69 0 0 0 0 0 0 0 0 0 0 66 0 0 51 0 0 0 57 0 0 0 0 0 0 0 0 0 0 63 63 0 57 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 0.390625 0.390625 -0.390625 -0.390625 -0.390625 0.390625 -0.390625 0.390625 -0.390625 0.390625 0.390625 -0.390625 -0.390625 0.390625 0.390625 0.390625 -0.390625 -0.390625 0.390625 0.390625 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" >
90.0 94.95 95.0 100.0 101.011 105.0 107.071 110.0 113.132 115.0 120.0 125.0 130.0 135.0 140.0 145.0 150.0 155.0 160.0 165.0 170.0 175.0 180.0 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 389.515 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 1000.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 2.51 2.51 2.42 2.379 2.379 2.379 2.442 2.51 2.564 2.702 2.837 2.971 3.105 3.241 3.379 3.52 3.665 3.813 3.965 4.121 4.28 4.443 4.61 4.779 4.951 5.126 5.302 5.48 5.659 5.838 6.018 6.198 6.378 6.558 6.737 6.915 7.092 7.268 7.443 7.617 7.79 7.961 8.13 8.298 8.464 8.627 8.789 8.948 9.105 9.258 9.408 9.554 9.694 9.83 9.958 10.08 10.192 10.294 10.384 10.46 10.521 10.566 10.592 10.6 10.6 10.596 10.586 10.571 10.549 10.522 10.49 10.453 10.411 10.365 10.314 10.259 10.2 10.138 10.072 10.003 9.93 9.855 9.778 9.697 9.615 9.53 9.443 9.355 9.265 9.173 9.08 8.985 8.89 8.793 8.696 8.598 8.499 8.4 8.3 8.2 8.1 8.0 7.899 7.799 7.699 7.598 7.498 7.399 7.299 7.2 7.102 7.004 6.906 6.81 6.713 6.618 6.523 6.429 6.335 6.243 6.151 6.06 5.97 5.88 5.792 5.704 5.618 5.532 5.447 5.364 5.281 5.199 5.118 5.038 4.959 4.881 4.804 4.728 4.653 4.579 4.506 4.434 4.363 4.293 4.224 4.156 4.088 4.022 3.957 3.892 3.829 3.766 3.704 3.644 3.584 3.525 3.467 3.409 3.353 3.298 3.243 3.189 3.136 3.084 3.033 2.982 2.932 2.883 2.835 2.788 2.741 2.695 2.65 2.605 2.561 2.518 2.476 2.434 2.393 2.353 2.313 2.274 2.236 2.198 2.161 2.124 2.088

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="2.51" PeakHeight="94.95" Num="3" Error="0.636">
-7.227 2.924 -0.647
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="2.51" EndFrequency="10.6" PeakHeight="389.515" Num="5" zHalfNm="266.488" Error="3.262">
-254.539 -32.571 14.193 -5.486 2.02
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="18.182" Depth="0.131"/>
<TopsideChapman PeakHeight="389.515" PeakDensity="1394044.6" PeakScaleHeight="90.098" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
