<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-02-27 -058 16:10:00.000"
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: 90% PACIFIC flags: Multiple candidates for F2x cusp, Multiple candidates for F2o 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) 16:10:00</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">
FF202605802271610009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="31" >
<URSI ID="00" Val="11.950" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.600" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="31.067" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="3.000" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="30" Val="4.650" Name="foEs" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="5.400" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="81" Val="3.000" Name="fminE" Units="MHz" QL="/" DL="/" />
<URSI ID="20" Val="3.410" Name="foE" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="12.250" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="305.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="305.000" Name="h`F2" Units="km" QL="/" DL="/" />
<URSI ID="24" Val="100.467" Name="h`E" Units="km" QL="/" DL="/" />
<URSI ID="34" Val="115.500" Name="h`Es" Units="km" QL="/" DL="/" />
<URSI ID="90" Val="97.332" Name="hmE" Units="km" QL="/" DL="/" />
<URSI ID="83" Val="7.146" Name="yE" Units="km" QL="/" DL="/" />
<URSI ID="86" Val="0.300" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="11.250" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="482.054" Name="h`(fMUF)" Units="km" QL="/" DL="/" />
<Modeled Name="foEp" Val="3.365" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="5.400" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="5.400" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<Modeled Name="foF1p" Val="4.348" Units="MHz" ModelName="IRI-90" />
<URSI ID="92" Val="352.827" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="256.727" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="7.802" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<Custom Name="fminEs" Val="3.450" Description="Minimum frequency of Es-layer" Units="MHz" />
<URSI ID="94" Val="126.059" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="55.538" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="71.132" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="168.930" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.180" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="3">
<Trace Type="standard" Layer="F2" Polarization="O" Num="132">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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 11.05 11.1 11.15 11.2 11.25 11.3 11.35 11.4 11.45 11.5 11.55 11.6 11.65 11.7 11.75 11.8 11.85 11.9 11.95
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
305.000 305.000 305.000 307.500 310.000 305.000 310.000 310.000 315.000 315.000 315.000 315.000 315.000 315.000 317.500 320.000 320.000 325.000 325.000 325.000 325.000 325.000 325.000 325.000 330.000 330.000 330.000 335.000 335.000 335.000 335.000 340.000 340.000 340.000 340.000 340.000 345.000 345.000 345.000 345.000 345.000 350.000 350.000 350.000 350.000 350.000 355.000 355.000 355.000 355.000 360.000 360.000 365.000 365.000 365.000 365.000 370.000 370.000 370.000 375.000 375.000 380.000 380.000 380.000 380.000 383.333 386.667 390.000 390.000 392.500 395.000 395.000 395.000 395.000 400.000 400.000 405.000 405.000 400.000 405.000 410.000 412.500 415.000 415.000 415.000 415.000 415.000 420.000 421.667 423.333 425.000 426.250 427.500 428.750 430.000 435.000 435.000 435.000 435.000 436.667 438.333 440.000 445.000 440.000 445.000 450.000 452.500 455.000 457.500 460.000 460.000 470.000 470.000 472.500 475.000 475.000 478.409 482.054 485.961 490.159 494.683 499.571 504.870 510.633 516.925 523.821 531.412 539.811 549.152 559.605 571.378 584.741
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
45 54 57 0 48 51 51 54 51 51 54 48 51 48 0 54 54 57 57 54 0 0 0 45 51 51 57 60 63 63 60 57 60 60 60 57 60 63 66 63 63 57 0 63 0 66 63 0 57 54 66 66 57 57 60 57 60 48 63 60 60 54 57 60 60 0 0 45 54 0 51 60 60 66 63 66 60 63 66 54 60 0 54 60 48 60 57 57 0 0 51 0 0 0 51 51 0 0 54 0 0 0 57 0 0 57 42 57 0 51 54 51 51 0 48 51 48 54 51 48 0 42 48 48 48 0 42 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 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 -2.734375 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 -0.390625 0.390625 -0.390625 0.390625 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 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 -2.734375 0.390625 0.390625 0.390625 0.390625 -1.171875 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 2.734375 0.390625 0.390625 0.390625 1.171875 0.390625 -0.390625 -1.953125 -2.734375 0.390625 1.171875
</TraceValueList>
</Trace>
<Trace Type="standard" Layer="E" Polarization="O" Num="9">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
3.0 3.05 3.1 3.15 3.2 3.25 3.3 3.35 3.4
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
100.467 101.084 101.759 102.504 103.338 104.286 105.387 106.707 108.369
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
48 0 54 0 60 63 63 0 0
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
1.171875 -2.734375 -0.390625 0.390625 -0.390625 0.390625 -0.390625 0.390625 0.390625
</TraceValueList>
</Trace>
<Trace Type="standard" Layer="Es" Polarization="O" Num="25">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
106.000 107.000 108.000 109.000 110.000 111.000 112.000 113.000 114.000 115.000 116.000 117.000 118.000 119.000 120.000 121.000 122.000 123.000 124.000 125.000 125.000 125.000 125.000 125.000 125.000
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 45 51 54 0 51 45
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
0.390625 0.390625 -1.171875 -1.953125 0.390625 -0.390625 -1.171875 0.390625 0.390625 1.953125 0.390625 1.953125 2.734375 -1.953125 2.734375 0.390625 1.953125 -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 97.332 98.986 100.0 100.64 102.294 105.0 110.0 115.0 120.0 125.0 130.0 135.0 140.0 145.0 150.0 155.0 160.0 165.0 170.0 175.0 180.0 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 352.827 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 1000.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 3.219 3.41 3.286 3.286 3.286 3.41 3.518 3.69 3.845 3.991 4.131 4.269 4.405 4.541 4.678 4.815 4.954 5.095 5.238 5.383 5.531 5.683 5.837 5.995 6.156 6.321 6.49 6.662 6.838 7.018 7.202 7.39 7.581 7.775 7.973 8.174 8.379 8.586 8.796 9.008 9.222 9.438 9.655 9.873 10.091 10.309 10.525 10.738 10.946 11.148 11.339 11.515 11.671 11.799 11.892 11.942 11.95 11.949 11.938 11.917 11.885 11.844 11.794 11.734 11.667 11.592 11.509 11.42 11.325 11.224 11.117 11.006 10.891 10.771 10.647 10.521 10.391 10.259 10.124 9.987 9.849 9.709 9.568 9.427 9.284 9.141 8.998 8.854 8.711 8.568 8.425 8.283 8.141 8.001 7.861 7.722 7.584 7.448 7.312 7.179 7.046 6.915 6.785 6.657 6.531 6.406 6.283 6.162 6.042 5.924 5.808 5.693 5.58 5.469 5.36 5.253 5.147 5.043 4.941 4.841 4.742 4.645 4.55 4.457 4.365 4.275 4.186 4.1 4.014 3.931 3.849 3.769 3.69 3.612 3.536 3.462 3.389 3.318 3.248 3.179 3.112 3.046 2.981 2.918 2.856 2.795 2.736 2.677 2.62 2.564 2.509 2.456 2.403 2.352 2.301 2.252 2.204 2.157 2.11 2.065 2.021 1.977 1.935 1.893 1.852 1.812 1.773 1.735 1.698 1.661 1.625 1.59 1.556 1.522 1.489 1.457 1.426 1.395 1.365 1.335 1.306 1.278 1.25 1.223 1.197 1.171 1.146

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="3.41" PeakHeight="97.332" Num="3" Error="1.737">
-10.903 4.706 -1.135
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="3.41" EndFrequency="11.95" PeakHeight="352.827" Num="5" zHalfNm="256.727" Error="5.237">
-202.193 -62.643 12.989 -0.368 1.682
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="4.962" Depth="0.124"/>
<TopsideChapman PeakHeight="352.827" PeakDensity="1771743.1" PeakScaleHeight="71.132" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
