<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-01-28 -028 11:20:00.000"
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="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: 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" >
2026.01.28 (028) 11:20:00</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">
FF202602801281120009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="31" >
<URSI ID="00" Val="8.800" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.758" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="24.269" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="2.500" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="30" Val="3.350" Name="foEs" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="4.150" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="81" Val="2.500" Name="fminE" Units="MHz" QL="/" DL="/" />
<URSI ID="20" Val="2.810" Name="foE" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="9.150" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="225.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="225.000" Name="h`F2" Units="km" QL="/" DL="/" />
<URSI ID="24" Val="105.852" Name="h`E" Units="km" QL="/" DL="/" />
<URSI ID="34" Val="115.714" Name="h`Es" Units="km" QL="/" DL="/" />
<URSI ID="90" Val="100.392" Name="hmE" Units="km" QL="/" DL="/" />
<URSI ID="83" Val="10.179" Name="yE" Units="km" QL="/" DL="/" />
<URSI ID="86" Val="0.100" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="7.750" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="390.000" 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="2.760" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="4.150" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="4.150" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="334.668" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="212.980" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="6.739" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<Custom Name="fminEs" Val="2.850" Description="Minimum frequency of Es-layer" Units="MHz" />
<URSI ID="94" Val="166.242" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="36.967" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="91.183" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="175.330" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="2.040" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="3">
<Trace Type="standard" Layer="F2" Polarization="O" Num="94">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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 8.45 8.5 8.55 8.6 8.65 8.7 8.75 8.8
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
225.000 230.000 232.500 235.000 237.500 240.000 242.500 245.000 255.000 252.500 250.000 250.000 252.143 254.286 256.429 258.571 260.714 262.857 265.000 270.000 270.000 270.000 275.000 277.500 280.000 280.000 281.667 283.333 285.000 285.000 287.500 290.000 290.000 295.000 300.000 300.000 300.000 305.000 305.000 307.500 310.000 312.500 315.000 317.500 320.000 320.000 321.667 323.333 325.000 325.000 330.000 335.000 337.308 339.615 341.923 344.231 346.538 348.846 351.154 353.462 355.769 358.077 360.385 362.692 365.000 370.000 370.000 370.000 380.000 385.000 385.000 390.000 390.000 400.000 400.000 405.000 415.000 420.000 425.000 435.000 441.757 449.157 457.295 466.288 476.279 487.443 499.999 514.225 530.478 549.225 571.087 596.911 627.881 665.707
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
63 60 48 0 57 0 0 0 51 0 57 54 0 0 0 0 0 0 57 51 0 57 54 0 48 45 0 0 57 57 0 63 54 60 60 63 63 60 0 0 0 0 57 0 57 63 0 0 69 69 69 57 0 0 0 0 0 0 54 0 54 0 54 0 60 48 63 63 57 60 69 72 72 69 69 69 63 60 60 63 60 60 69 69 63 63 60 63 60 57 60 54 45 48
</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 -2.734375 0.390625 0.390625 1.171875 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 -0.390625 0.390625 0.390625 0.390625 -0.390625 0.390625 -0.390625 0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 0.390625 -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 0.390625 -0.390625 -1.171875 -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 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -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>
<Trace Type="standard" Layer="E" Polarization="O" Num="7">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
2.5 2.55 2.6 2.65 2.7 2.75 2.8
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
105.852 106.992 108.268 109.718 111.403 113.421 115.957
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
48 0 54 54 0 0 63
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
-0.390625 1.171875 -0.390625 0.390625 -0.390625 0.390625 0.390625
</TraceValueList>
</Trace>
<Trace Type="standard" Layer="Es" Polarization="O" Num="11">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
2.85 2.9 2.95 3.0 3.05 3.1 3.15 3.2 3.25 3.3 3.35
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
115.714 117.143 118.571 120.000 120.000 120.000 120.000 120.000 125.000 125.000 125.000
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
0 0 0 54 0 63 60 57 60 54 60
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
-1.953125 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 95.0 100.0 100.392 104.711 105.0 109.029 110.0 113.348 115.0 120.0 125.0 130.0 135.0 140.0 145.0 150.0 155.0 160.0 165.0 170.0 175.0 180.0 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 334.668 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 1000.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 2.384 2.808 2.81 2.685 2.685 2.685 2.713 2.81 2.862 3.015 3.165 3.315 3.467 3.621 3.779 3.941 4.107 4.278 4.453 4.631 4.813 4.997 5.183 5.371 5.558 5.745 5.931 6.114 6.295 6.473 6.646 6.815 6.98 7.14 7.294 7.442 7.585 7.722 7.852 7.975 8.091 8.199 8.3 8.392 8.476 8.551 8.616 8.672 8.718 8.754 8.78 8.795 8.8 8.8 8.797 8.789 8.777 8.759 8.738 8.712 8.682 8.648 8.61 8.569 8.524 8.477 8.426 8.373 8.316 8.258 8.197 8.133 8.068 8.001 7.932 7.861 7.789 7.715 7.64 7.564 7.487 7.409 7.33 7.251 7.171 7.09 7.009 6.927 6.845 6.763 6.681 6.598 6.516 6.434 6.351 6.269 6.187 6.106 6.024 5.943 5.863 5.782 5.703 5.623 5.545 5.466 5.389 5.312 5.235 5.159 5.084 5.01 4.936 4.863 4.791 4.719 4.648 4.578 4.509 4.44 4.372 4.305 4.239 4.174 4.109 4.045 3.982 3.92 3.858 3.798 3.738 3.679 3.62 3.563 3.506 3.45 3.395 3.341 3.287 3.234 3.182 3.131 3.08 3.03 2.981 2.932 2.885 2.838 2.791 2.746 2.701 2.656 2.613 2.57 2.528 2.486 2.445 2.405 2.365 2.326 2.287 2.249 2.212 2.175 2.139 2.104 2.069 2.034 2.0 1.967 1.934 1.902 1.87 1.839 1.808 1.778 1.748 1.719 1.69 1.662 1.634 1.606 1.579 1.553 1.527 1.501 1.476

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="2.81" PeakHeight="100.392" Num="3" Error="2.766">
-15.282 6.341 -1.451
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="2.81" EndFrequency="8.8" PeakHeight="334.668" Num="5" zHalfNm="212.98" Error="4.303">
-220.342 -1.077 0.139 -0.855 0.815
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="12.956" Depth="0.125"/>
<TopsideChapman PeakHeight="334.668" PeakDensity="960794.06" PeakScaleHeight="91.183" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
