<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-02-25 -056 17:10:00.000"
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="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" >
2026.02.25 (056) 17:10:00</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">
FF202605602251710009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="29" >
<URSI ID="00" Val="10.550" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.444" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="25.779" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="3.850" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="30" Val="5.500" Name="foEs" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="6.650" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="10.850" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="355.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="355.000" Name="h`F2" Units="km" QL="/" DL="/" />
<URSI ID="34" Val="105.000" 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="0.350" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="10.050" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="540.000" 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="3.246" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="6.650" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="6.650" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<Modeled Name="foF1p" Val="4.293" Units="MHz" ModelName="IRI-90" />
<URSI ID="92" Val="368.743" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="251.471" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="8.179" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<Custom Name="fminEs" Val="3.850" Description="Minimum frequency of Es-layer" Units="MHz" />
<URSI ID="94" Val="148.154" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="49.560" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="81.955" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="200.350" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.170" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="2">
<Trace Type="standard" Layer="F2" Polarization="O" Num="79">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
355.000 360.000 360.000 365.000 365.000 365.000 365.000 365.000 370.000 370.000 375.000 375.000 377.500 380.000 385.000 385.000 385.000 390.000 392.500 395.000 395.000 400.000 400.000 405.000 405.000 410.000 415.000 415.000 415.000 420.000 425.000 425.000 430.000 430.000 435.000 440.000 440.000 445.000 450.000 455.000 455.000 460.000 465.000 465.000 470.000 475.000 475.000 480.000 480.000 485.000 490.000 492.500 495.000 500.000 500.000 502.500 505.000 505.000 510.000 510.000 515.000 520.000 520.000 525.000 530.000 535.000 540.000 540.000 540.000 545.000 555.000 559.646 564.836 570.673 577.284 584.836 593.544 603.696 615.684
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
51 51 51 48 0 54 54 48 51 51 51 54 0 57 51 0 57 54 0 57 57 51 57 48 57 54 48 57 60 60 54 60 57 63 60 57 60 60 60 57 66 66 66 72 69 63 69 63 66 63 57 48 60 51 60 51 63 63 60 60 63 57 63 63 57 57 54 45 51 48 48 48 51 51 51 51 42 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 -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 -1.953125 2.734375
</TraceValueList>
</Trace>
<Trace Type="standard" Layer="Es" Polarization="O" Num="34">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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 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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
105.000 105.000 105.000 105.000 105.000 105.000 105.000 105.000 105.000 110.000 110.000 107.500 105.000 105.000 105.000 110.000 110.000 110.000 110.000 110.000 110.000 110.000 110.000 110.000 110.000 110.000 110.000 110.000 110.000 115.000 115.000 115.000 115.000 115.000
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
48 0 0 45 0 0 0 54 54 60 51 0 60 54 0 57 51 57 0 57 48 60 0 57 0 0 51 0 60 51 0 54 51 45
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
0.390625 0.390625 -1.171875 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
</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" >
89.506 90.0 95.0 100.0 105.0 110.0 112.147 114.293 115.0 116.44 120.0 125.0 130.0 135.0 140.0 145.0 150.0 155.0 160.0 165.0 170.0 175.0 180.0 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 368.743 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 1000.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.239 2.183 2.809 3.14 3.246 3.124 3.124 3.164 3.246 3.375 3.55 3.719 3.886 4.051 4.215 4.378 4.54 4.701 4.861 5.02 5.178 5.335 5.491 5.646 5.799 5.951 6.102 6.252 6.401 6.549 6.695 6.841 6.986 7.131 7.275 7.418 7.561 7.703 7.845 7.988 8.13 8.272 8.414 8.556 8.699 8.842 8.986 9.13 9.274 9.419 9.564 9.709 9.853 9.995 10.133 10.264 10.381 10.476 10.536 10.55 10.55 10.544 10.531 10.511 10.484 10.451 10.412 10.367 10.317 10.261 10.201 10.135 10.066 9.992 9.915 9.834 9.75 9.662 9.572 9.479 9.384 9.287 9.188 9.087 8.984 8.88 8.775 8.668 8.561 8.453 8.345 8.235 8.126 8.016 7.906 7.796 7.687 7.577 7.468 7.358 7.25 7.142 7.034 6.927 6.821 6.715 6.61 6.506 6.403 6.301 6.2 6.099 6.0 5.902 5.804 5.708 5.613 5.519 5.427 5.335 5.244 5.155 5.067 4.98 4.894 4.809 4.726 4.644 4.562 4.482 4.404 4.326 4.25 4.174 4.1 4.027 3.955 3.885 3.815 3.746 3.679 3.613 3.548 3.483 3.42 3.358 3.297 3.237 3.178 3.12 3.063 3.007 2.952 2.898 2.845 2.792 2.741 2.691 2.641 2.592 2.544 2.497 2.451 2.406 2.361 2.317 2.274 2.232 2.191 2.15 2.11 2.071 2.032 1.994 1.957 1.921 1.885 1.85 1.815 1.781 1.748 1.715 1.683 1.652 1.621 1.59 1.561

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="3.246" PeakHeight="110.0" Num="3" Error="0.0">
-30.393 12.993 -3.094
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="3.246" EndFrequency="10.55" PeakHeight="368.743" Num="5" zHalfNm="251.471" Error="2.813">
-213.67 -63.015 31.08 -8.197 1.499
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="6.44" Depth="0.122"/>
<TopsideChapman PeakHeight="368.743" PeakDensity="1380924.4" PeakScaleHeight="81.955" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
