<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-02-07 -038 17:40:00.000"
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 1 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" >
2026.02.07 (038) 17:40:00</StartTime>
<SolarTerrestrialData>
<GyroFrequency Val="0.63" Model="IGRF 3.0" Altitude="300"/>
<DipAngle Val="-11.13" 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">
FF202603802071740009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="29" >
<URSI ID="00" Val="10.175" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="10" Val="5.723" Name="foF1" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.282" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="23.162" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="4.650" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="4.650" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="10.450" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="250.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="355.000" 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="0.150" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="9.400" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="575.000" Name="h`(fMUF)" Units="km" QL="/" DL="/" />
<Custom Name="dlt foF2" Val="0.025" Description="Adjustment to the scaled foF2 during profile inversion" Units="MHz" />
<Modeled Name="foEp" Val="3.142" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="4.650" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="5.750" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<Modeled Name="foF1p" Val="4.243" Units="MHz" ModelName="IRI-90" />
<URSI ID="92" Val="407.832" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="91" Val="216.830" Name="hmF1" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="270.947" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="8.366" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="149.289" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="95" Val="75.635" Name="yF1" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="54.265" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="97.171" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="223.920" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.320" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="2">
<Trace Type="standard" Layer="F2" Polarization="O" Num="89">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
355.000 355.000 355.000 360.000 360.000 365.000 365.000 365.000 365.000 370.000 375.000 380.000 380.000 382.500 385.000 387.500 390.000 390.000 393.000 396.000 399.000 402.000 405.000 410.000 410.000 410.000 415.000 417.500 420.000 425.000 425.000 430.000 435.000 435.000 440.000 440.000 445.000 450.000 450.000 450.000 460.000 460.000 465.000 465.000 475.000 480.000 485.000 490.000 490.000 495.000 495.000 500.000 505.000 515.000 515.000 520.000 520.000 525.000 530.000 535.000 540.000 540.000 545.000 550.000 550.000 550.000 550.000 555.000 560.000 560.000 565.000 570.000 575.000 575.000 580.000 585.000 590.000 600.000 605.000 610.000 615.000 620.000 630.000 639.843 651.080 664.029 679.114 696.912 718.225
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
51 57 54 60 63 57 63 60 0 0 0 45 54 0 0 0 51 54 0 0 0 0 48 48 51 51 57 0 60 48 60 57 51 48 51 54 63 54 0 57 57 60 60 57 54 60 57 48 57 51 60 60 57 57 51 51 60 60 60 63 57 60 57 51 0 57 54 57 54 57 57 0 51 60 57 57 54 45 45 51 48 51 48 48 48 48 45 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 1.171875 -0.390625
</TraceValueList>
</Trace>
<Trace Type="standard" Layer="F1" Polarization="O" Num="22">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
250.000 255.000 260.000 265.000 272.500 280.000 285.000 290.000 295.000 300.000 305.000 310.000 315.000 320.000 325.000 330.000 335.000 340.000 340.000 345.000 348.333 351.667
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
48 51 45 45 0 48 48 0 51 0 45 0 45 0 0 48 0 48 51 51 0 0
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
0.390625 -0.390625 -1.953125 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 1.171875 -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="189">
<AltitudeList Type="float" Units="km" Description="Altitude above station level" >
89.522 90.0 95.0 100.0 105.0 110.0 112.594 115.0 115.189 117.783 120.0 125.0 130.0 135.0 140.0 145.0 150.0 155.0 160.0 165.0 170.0 175.0 180.0 185.0 190.0 195.0 200.0 205.0 210.0 215.0 216.83 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 407.832 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 1000.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.238 2.113 2.719 3.04 3.142 3.02 3.02 3.02 3.142 3.227 3.392 3.548 3.702 3.857 4.012 4.164 4.312 4.453 4.587 4.713 4.834 4.95 5.062 5.171 5.278 5.385 5.494 5.605 5.708 5.723 5.817 5.96 6.099 6.235 6.369 6.503 6.636 6.77 6.903 7.037 7.17 7.302 7.435 7.566 7.697 7.826 7.955 8.082 8.207 8.331 8.453 8.574 8.694 8.812 8.928 9.043 9.157 9.269 9.38 9.49 9.597 9.702 9.805 9.902 9.993 10.072 10.134 10.169 10.175 10.175 10.17 10.16 10.145 10.126 10.102 10.074 10.041 10.005 9.965 9.921 9.874 9.824 9.77 9.714 9.654 9.592 9.528 9.461 9.392 9.32 9.247 9.172 9.096 9.017 8.938 8.857 8.775 8.692 8.607 8.522 8.436 8.35 8.262 8.175 8.086 7.998 7.909 7.82 7.73 7.641 7.552 7.462 7.373 7.284 7.195 7.106 7.018 6.93 6.842 6.754 6.668 6.581 6.495 6.41 6.325 6.24 6.157 6.074 5.991 5.91 5.828 5.748 5.668 5.59 5.511 5.434 5.357 5.281 5.206 5.132 5.058 4.986 4.914 4.842 4.772 4.702 4.634 4.566 4.499 4.432 4.367 4.302 4.238 4.175 4.113 4.051 3.991 3.931 3.872 3.813 3.756 3.699 3.643 3.588 3.533 3.479 3.426 3.374 3.322 3.271 3.221 3.172 3.123 3.075 3.027 2.981 2.935 2.889 2.845 2.801 2.757 2.714 2.672 2.631 2.59 2.549 2.51 2.471

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="3" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="3.142" PeakHeight="110.0" Num="3" Error="0.0">
-30.311 12.873 -3.04
</ShiftedChebyshev>
<ShiftedChebyshev Region="F1" StartFrequency="3.142" EndFrequency="5.723" PeakHeight="216.83" Num="5" Error="0.0">
-78.302 -31.09 14.073 -5.205 1.477
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="5.723" EndFrequency="10.175" PeakHeight="407.832" Num="5" zHalfNm="270.947" Error="5.29">
-156.745 -45.861 14.556 -4.04 1.088
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="7.783" Depth="0.122"/>
<TopsideChapman PeakHeight="407.832" PeakDensity="1284499.1" PeakScaleHeight="97.171" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
