<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-02-27 -058 13:30:00.000"
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 11 0 0 0 0 0 0 0 0 1 0 "/>
<Comments>AR.5002.44 Confidence: 95% PACIFIC flags: Multiple candidates for F2x cusp</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" >
2026.02.27 (058) 13:30:00</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">
FF202605802271330009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="28" >
<URSI ID="00" Val="11.000" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.598" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="28.583" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="4.350" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="30" Val="4.800" Name="foEs" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="5.000" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="11.550" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="250.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="250.000" Name="h`F2" Units="km" QL="/" DL="/" />
<URSI ID="34" Val="125.000" 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="0.400" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="10.550" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="495.000" Name="h`(fMUF)" Units="km" QL="/" DL="/" />
<Modeled Name="foEp" Val="3.297" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="5.000" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="5.000" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<Modeled Name="foF1p" Val="4.317" Units="MHz" ModelName="IRI-90" />
<URSI ID="92" Val="347.800" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="253.925" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="7.151" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<Custom Name="fminEs" Val="4.350" Description="Minimum frequency of Es-layer" Units="MHz" />
<URSI ID="94" Val="119.233" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="44.630" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="66.995" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="165.710" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.100" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="2">
<Trace Type="standard" Layer="F2" Polarization="O" Num="121">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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 10.65 10.7 10.75 10.8 10.85 10.9 10.95 11.0
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
250.000 255.000 260.000 265.000 270.000 275.000 280.000 285.000 285.000 290.000 293.750 297.500 301.250 305.000 310.000 315.000 315.000 320.000 320.000 320.000 325.000 325.000 325.000 325.000 326.429 327.857 329.286 330.714 332.143 333.571 335.000 335.000 340.000 340.000 340.000 340.000 340.000 342.500 345.000 345.000 346.667 348.333 350.000 351.667 353.333 355.000 355.000 360.000 361.250 362.500 363.750 365.000 365.000 370.000 370.000 370.000 375.000 375.000 377.500 380.000 380.000 380.000 385.000 385.000 385.000 390.000 395.000 395.000 400.000 400.000 400.000 405.000 410.000 410.000 415.000 415.000 415.000 415.000 420.000 425.000 425.000 430.000 430.000 430.000 435.000 435.000 435.000 440.000 440.000 440.000 442.500 445.000 450.000 450.000 450.000 455.000 460.000 460.000 462.500 465.000 470.000 470.000 470.000 475.000 475.000 480.000 480.000 485.000 490.000 492.500 495.000 495.000 500.000 505.000 509.335 514.239 519.832 526.269 533.757 542.577 553.118
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
54 51 54 48 0 0 0 51 48 54 48 0 0 48 54 57 57 57 57 57 57 54 54 48 0 0 0 0 0 0 51 51 51 0 54 54 54 0 51 48 0 0 0 0 0 57 60 54 0 0 0 63 69 57 57 66 57 60 0 63 69 69 63 63 63 66 60 60 51 60 63 63 54 60 51 60 66 66 66 60 66 60 66 69 63 66 66 63 63 66 0 63 60 60 60 60 51 57 48 57 45 51 54 48 51 45 45 42 42 0 48 48 48 51 51 51 48 45 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 2.734375 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 -2.734375 0.390625 -0.390625 0.390625 -2.734375 -0.390625 0.390625 0.390625 -0.390625 1.171875 0.390625 0.390625 -0.390625 0.390625 0.390625 -0.390625 -2.734375 -0.390625 0.390625 -0.390625 -0.390625 -0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 -0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 -0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 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 -2.734375 -0.390625 0.390625 0.390625 0.390625 0.390625 -0.390625 0.390625 0.390625 -2.734375 1.953125 1.171875
</TraceValueList>
</Trace>
<Trace Type="standard" Layer="Es" Polarization="O" Num="10">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
4.35 4.4 4.45 4.5 4.55 4.6 4.65 4.7 4.75 4.8
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
130.000 125.000 127.500 130.000 130.000 127.500 125.000 125.000 125.000 125.000
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
57 48 0 51 48 0 57 48 0 45
</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 2.734375 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" >
89.497 90.0 95.0 100.0 105.0 110.0 111.934 113.868 115.0 115.802 120.0 125.0 130.0 135.0 140.0 145.0 150.0 155.0 160.0 165.0 170.0 175.0 180.0 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 347.8 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 1000.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.24 2.218 2.853 3.19 3.297 3.175 3.175 3.246 3.297 3.438 3.595 3.746 3.893 4.039 4.185 4.331 4.479 4.628 4.779 4.932 5.087 5.245 5.404 5.566 5.73 5.896 6.063 6.233 6.404 6.576 6.75 6.925 7.102 7.279 7.457 7.637 7.817 7.998 8.18 8.364 8.548 8.733 8.92 9.107 9.296 9.486 9.677 9.868 10.06 10.25 10.437 10.616 10.778 10.909 10.988 11.0 10.999 10.988 10.966 10.933 10.89 10.838 10.777 10.708 10.631 10.547 10.456 10.359 10.256 10.148 10.036 9.919 9.799 9.675 9.547 9.418 9.286 9.152 9.016 8.879 8.741 8.602 8.462 8.322 8.182 8.042 7.902 7.762 7.623 7.485 7.348 7.211 7.076 6.941 6.808 6.677 6.546 6.418 6.29 6.165 6.041 5.918 5.798 5.679 5.562 5.447 5.333 5.222 5.112 5.004 4.898 4.793 4.691 4.59 4.491 4.394 4.299 4.206 4.114 4.024 3.936 3.85 3.765 3.682 3.601 3.521 3.443 3.366 3.292 3.218 3.146 3.076 3.007 2.94 2.874 2.809 2.746 2.684 2.623 2.564 2.506 2.45 2.394 2.34 2.287 2.235 2.184 2.135 2.086 2.039 1.992 1.947 1.902 1.859 1.817 1.775 1.735 1.695 1.656 1.618 1.581 1.545 1.51 1.475 1.441 1.408 1.376 1.345 1.314 1.284 1.254 1.225 1.197 1.17 1.143 1.117 1.091 1.066 1.041 1.018 0.994 0.971 0.949 0.927 0.906 0.885 0.865

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="3.297" PeakHeight="110.0" Num="3" Error="0.0">
-30.433 13.051 -3.121
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="3.297" EndFrequency="11.0" PeakHeight="347.8" Num="5" zHalfNm="253.925" Error="3.392">
-184.322 -65.502 21.055 -4.923 1.694
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="5.802" Depth="0.122"/>
<TopsideChapman PeakHeight="347.8" PeakDensity="1501240.8" PeakScaleHeight="66.995" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
