<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-01-28 -028 15:00:00.000"
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 22 0 0 0 0 0 0 0 0 1 0 "/>
<Comments>AR.5002.44 Confidence: 85% PACIFIC flags: Multiple candidates for F2x 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" >
2026.01.28 (028) 15:00:00</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">
FF202602801281500009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="29" >
<URSI ID="00" Val="10.350" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.618" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="27.093" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="4.600" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="30" Val="5.300" Name="foEs" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="5.750" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="11.250" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="345.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="345.000" Name="h`F2" Units="km" QL="/" DL="/" />
<URSI ID="34" Val="110.000" 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="0.600" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="10.000" 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="3.367" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="6.200" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="6.200" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<Modeled Name="foF1p" Val="4.349" Units="MHz" ModelName="IRI-90" />
<URSI ID="92" Val="339.341" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="244.385" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="7.249" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<Custom Name="fminEs" Val="4.600" Description="Minimum frequency of Es-layer" Units="MHz" />
<URSI ID="94" Val="118.307" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="40.131" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="68.147" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="173.010" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.040" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="2">
<Trace Type="standard" Layer="F2" Polarization="O" Num="93">
<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 10.2 10.25 10.3 10.35
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
350.000 349.444 348.889 348.333 347.778 347.222 346.667 346.111 345.556 345.000 345.000 345.000 345.000 345.000 350.000 350.000 350.000 350.000 350.000 350.000 350.000 350.000 350.000 355.000 355.000 360.000 360.000 360.000 360.000 365.000 365.000 365.000 365.000 365.000 370.000 370.000 375.000 375.000 375.000 375.000 378.333 381.667 385.000 385.000 390.000 390.000 395.000 395.000 395.000 400.000 405.000 405.000 405.000 410.000 415.000 415.000 415.000 420.000 420.000 425.000 425.000 430.000 430.000 435.000 440.000 440.000 445.000 445.000 450.000 455.000 455.000 460.000 460.000 465.000 470.000 475.000 475.000 480.000 480.000 480.000 485.000 485.000 487.500 490.000 495.000 495.000 500.000 504.590 509.993 516.445 524.286 534.016 546.415
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
51 0 51 0 0 0 0 60 0 57 57 54 54 48 51 51 51 51 51 0 0 48 45 60 60 57 60 60 60 60 60 60 57 51 60 60 60 60 57 54 0 0 60 60 63 63 60 63 60 60 51 57 63 57 45 57 60 57 60 60 63 63 63 63 57 63 60 63 63 57 63 60 57 57 57 45 54 48 54 60 54 57 0 57 57 60 54 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 -2.734375 -0.390625 -0.390625 -1.953125 -0.390625
</TraceValueList>
</Trace>
<Trace Type="standard" Layer="Es" Polarization="O" Num="15">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
110.000 115.000 113.333 111.667 110.000 110.000 110.000 110.000 110.000 110.000 110.000 110.000 110.000 110.000 110.000
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
51 57 0 0 57 0 60 60 60 60 0 0 0 63 60
</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
</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" >
89.487 90.0 95.0 100.0 105.0 110.0 111.646 113.293 114.939 115.0 120.0 125.0 130.0 135.0 140.0 145.0 150.0 155.0 160.0 165.0 170.0 175.0 180.0 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 339.341 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 1000.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.24 2.265 2.914 3.257 3.367 3.244 3.244 3.367 3.37 3.589 3.768 3.931 4.085 4.232 4.377 4.519 4.66 4.8 4.941 5.081 5.222 5.365 5.508 5.652 5.797 5.944 6.093 6.243 6.394 6.547 6.702 6.858 7.017 7.177 7.339 7.502 7.668 7.836 8.005 8.177 8.35 8.526 8.703 8.882 9.063 9.245 9.427 9.608 9.786 9.956 10.111 10.24 10.325 10.35 10.35 10.343 10.326 10.299 10.263 10.218 10.165 10.104 10.036 9.961 9.88 9.793 9.7 9.603 9.501 9.395 9.286 9.173 9.057 8.939 8.818 8.695 8.57 8.444 8.317 8.189 8.061 7.931 7.802 7.672 7.542 7.413 7.284 7.156 7.028 6.901 6.775 6.649 6.525 6.402 6.28 6.16 6.041 5.923 5.807 5.692 5.579 5.467 5.357 5.248 5.142 5.036 4.933 4.831 4.731 4.632 4.535 4.44 4.346 4.254 4.164 4.076 3.989 3.903 3.82 3.737 3.657 3.578 3.5 3.424 3.35 3.277 3.205 3.135 3.067 2.999 2.933 2.869 2.806 2.744 2.683 2.624 2.566 2.509 2.453 2.399 2.345 2.293 2.242 2.192 2.143 2.096 2.049 2.003 1.958 1.914 1.872 1.83 1.789 1.748 1.709 1.671 1.633 1.597 1.561 1.526 1.491 1.458 1.425 1.393 1.362 1.331 1.301 1.272 1.243 1.215 1.187 1.161 1.135 1.109 1.084 1.059 1.035 1.012 0.989 0.967 0.945 0.924 0.903 0.882 0.862 0.843 0.824

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="3.367" PeakHeight="110.0" Num="3" Error="0.0">
-30.484 13.127 -3.156
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="3.367" EndFrequency="10.35" PeakHeight="339.341" Num="5" zHalfNm="244.385" Error="4.941">
-179.735 -64.501 20.364 -1.603 1.073
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="4.939" Depth="0.123"/>
<TopsideChapman PeakHeight="339.341" PeakDensity="1329063.2" PeakScaleHeight="68.147" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
