<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-01-26 -026 20:20:00.000"
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 33 0 0 0 0 0 0 0 0 1 0 "/>
<Comments>AR.5002.44 Confidence: 65% 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" >
2026.01.26 (026) 20:20:00</StartTime>
<SolarTerrestrialData>
<GyroFrequency Val="0.63" Model="IGRF 3.0" Altitude="300"/>
<DipAngle Val="-11.12" 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">
FF202602601262020009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="28" >
<URSI ID="00" Val="9.750" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.189" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="21.341" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="2.650" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="30" Val="8.400" Name="foEs" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="5.450" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="10.050" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="355.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="355.000" Name="h`F2" Units="km" QL="/" DL="/" />
<URSI ID="34" Val="115.000" Name="h`Es" 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="0.100" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="9.000" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="610.000" Name="h`(fMUF)" Units="km" QL="/" DL="/" />
<Modeled Name="foEp" Val="2.070" 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="/" />
<URSI ID="92" Val="457.924" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="313.527" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="7.889" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<Custom Name="fminEs" Val="2.650" Description="Minimum frequency of Es-layer" Units="MHz" />
<URSI ID="94" Val="198.018" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="53.028" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="104.429" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="221.340" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.600" Name="B1" QL="/" DL="/" />
<URSI ID="32" Val="5.450" Name="fbEs" Units="MHz" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="2">
<Trace Type="standard" Layer="F2" Polarization="O" Num="87">
<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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
355.000 355.000 360.000 365.000 365.000 370.000 370.000 375.000 380.000 380.000 380.000 390.000 391.667 393.333 395.000 400.000 400.000 405.000 410.000 415.000 415.000 420.000 420.000 425.000 425.000 430.000 435.000 445.000 445.000 445.000 450.000 450.000 455.000 455.000 460.000 465.000 470.000 470.000 475.000 475.000 485.000 490.000 490.000 495.000 495.000 505.000 505.000 510.000 515.000 520.000 525.000 530.000 535.000 540.000 545.000 545.000 555.000 560.000 560.000 565.000 565.000 575.000 580.000 580.000 585.000 590.000 595.000 600.000 600.000 600.000 610.000 610.000 620.000 625.000 635.000 640.000 650.000 660.000 670.000 680.000 691.728 704.817 719.516 736.144 755.106 776.930 802.318
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
54 60 57 54 60 57 57 0 54 63 60 57 0 0 63 60 60 0 60 57 66 60 63 57 60 60 63 51 51 66 57 63 66 66 72 69 66 72 69 69 66 63 72 69 60 66 69 69 72 75 75 72 72 72 69 69 66 66 63 63 60 66 60 66 0 72 75 69 66 0 63 57 51 51 60 51 51 48 57 60 57 57 51 0 0 63 60
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
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</TraceValueList>
</Trace>
<Trace Type="standard" Layer="Es" Polarization="O" Num="116">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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 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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
105.000 105.000 105.000 105.500 106.000 106.500 107.000 107.500 108.000 108.500 109.000 109.500 110.000 105.000 105.000 105.000 105.000 105.000 107.500 110.000 105.000 105.000 105.000 107.500 110.000 110.000 115.000 113.333 111.667 110.000 105.000 105.000 107.500 110.000 110.000 110.000 110.000 110.000 115.000 115.000 120.000 121.667 123.333 125.000 115.000 114.000 113.000 112.000 111.000 110.000 110.000 110.000 120.000 117.500 115.000 110.000 110.000 110.000 110.000 110.000 110.000 110.000 110.000 110.000 110.000 110.789 111.579 112.368 113.158 113.947 114.737 115.526 116.316 117.105 117.895 118.684 119.474 120.263 121.053 121.842 122.632 123.421 124.211 125.000 115.000 115.000 115.000 115.000 115.263 115.526 115.789 116.053 116.316 116.579 116.842 117.105 117.368 117.632 117.895 118.158 118.421 118.684 118.947 119.211 119.474 119.737 120.000 115.000 115.000 115.000 115.000 112.500 110.000 110.000 110.000 110.000
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
63 57 66 0 0 0 54 0 57 0 0 0 63 66 0 69 69 63 0 66 72 66 0 0 60 60 54 0 0 60 72 66 60 66 0 60 66 69 54 54 51 0 0 51 54 0 0 0 0 60 0 57 51 0 54 60 63 0 0 63 66 66 57 57 66 54 0 0 57 0 0 0 51 0 0 0 48 0 0 0 0 0 0 45 48 48 0 48 0 0 0 0 0 0 0 0 48 0 0 0 0 48 0 0 0 0 45 45 0 0 51 0 45 48 48 45
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
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</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" >
89.742 90.0 95.0 100.0 105.0 110.0 115.0 117.827 120.0 125.0 125.654 130.0 133.481 135.0 140.0 145.0 150.0 155.0 160.0 165.0 170.0 175.0 180.0 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 457.924 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 1000.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.222 1.388 1.793 2.003 2.07 2.017 1.939 1.939 1.939 1.939 2.012 2.07 2.107 2.222 2.333 2.443 2.554 2.665 2.779 2.896 3.015 3.138 3.264 3.394 3.527 3.663 3.802 3.944 4.087 4.233 4.379 4.527 4.675 4.822 4.97 5.117 5.263 5.409 5.553 5.697 5.839 5.98 6.12 6.258 6.396 6.532 6.667 6.801 6.933 7.065 7.195 7.325 7.453 7.58 7.707 7.832 7.956 8.078 8.2 8.32 8.438 8.555 8.67 8.782 8.892 8.999 9.103 9.202 9.297 9.385 9.467 9.541 9.606 9.66 9.703 9.732 9.748 9.75 9.75 9.746 9.738 9.725 9.709 9.69 9.666 9.639 9.609 9.575 9.538 9.499 9.456 9.411 9.363 9.313 9.26 9.205 9.148 9.089 9.028 8.966 8.902 8.836 8.768 8.7 8.63 8.559 8.486 8.413 8.339 8.264 8.188 8.112 8.035 7.957 7.879 7.801 7.722 7.643 7.564 7.484 7.405 7.325 7.245 7.166 7.086 7.006 6.927 6.848 6.769 6.69 6.612 6.534 6.456 6.378 6.301 6.225 6.148 6.073 5.997 5.923 5.848 5.775 5.701 5.629 5.557 5.485 5.414 5.344 5.275 5.206 5.137 5.069 5.002 4.936 4.87 4.805 4.741 4.677 4.614 4.551 4.489 4.428 4.368 4.308 4.249 4.19 4.133 4.075 4.019 3.963 3.908 3.854 3.8 3.747 3.694 3.642 3.591 3.54 3.491 3.441 3.392 3.344 3.297 3.25 3.204 3.158 3.113

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="2.07" PeakHeight="110.0" Num="3" Error="0.0">
-29.172 11.258 -2.344
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="2.07" EndFrequency="9.75" PeakHeight="457.924" Num="5" zHalfNm="313.527" Error="5.624">
-303.674 -37.151 23.727 -10.77 3.425
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="23.481" Depth="0.131"/>
<TopsideChapman PeakHeight="457.924" PeakDensity="1179435.5" PeakScaleHeight="104.429" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
