<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-02-25 -056 19:50:00.000"
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" >
2026.02.25 (056) 19:50:00</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">
FF202605602251950009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="28" >
<URSI ID="00" Val="9.550" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.405" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="22.964" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="2.750" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="30" Val="3.900" Name="foEs" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="4.050" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="9.850" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="260.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="260.000" Name="h`F2" Units="km" QL="/" DL="/" />
<URSI ID="34" Val="100.000" 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="0.100" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="7.500" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="405.000" 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="2.404" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="4.050" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="4.050" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="401.633" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="253.775" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="8.509" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<Custom Name="fminEs" Val="2.750" Description="Minimum frequency of Es-layer" Units="MHz" />
<URSI ID="94" Val="199.778" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="50.226" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="104.697" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="211.180" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.840" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="2">
<Trace Type="standard" Layer="F2" Polarization="O" Num="111">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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 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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
260.000 265.000 266.250 267.500 268.750 270.000 265.000 270.000 270.000 275.000 276.429 277.857 279.286 280.714 282.143 283.571 285.000 285.000 287.500 290.000 295.000 297.000 299.000 301.000 303.000 305.000 306.000 307.000 308.000 309.000 310.000 311.667 313.333 315.000 315.000 315.000 317.333 319.667 322.000 324.333 326.667 329.000 331.333 333.667 336.000 338.333 340.667 343.000 345.333 347.667 350.000 355.000 355.000 360.000 360.000 365.000 365.000 370.000 370.000 375.000 375.000 380.000 385.000 390.000 390.000 395.000 400.000 405.000 405.000 405.000 415.000 420.000 420.000 425.000 430.000 435.000 450.000 455.000 460.000 460.000 465.000 470.000 480.000 485.000 495.000 500.000 510.000 515.000 520.000 525.000 535.000 540.000 540.000 555.000 555.000 565.000 570.000 575.000 585.000 595.000 600.000 610.000 619.436 629.833 641.345 654.164 668.524 684.722 703.133 724.245 748.700
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
54 48 0 0 0 0 54 57 54 0 0 0 0 51 0 0 0 0 0 63 54 0 0 0 0 54 0 0 0 0 63 0 0 60 0 57 0 0 0 0 0 0 0 0 0 0 63 0 66 0 69 63 69 63 72 69 75 72 75 75 72 72 72 69 66 0 66 60 69 72 72 66 69 72 69 72 60 60 63 63 57 48 63 60 54 51 54 48 57 57 54 54 63 48 63 57 60 54 63 66 63 57 54 54 54 51 57 57 0 48 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 -2.734375 -0.390625 -0.390625 -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 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 -1.171875 -1.171875 -0.390625 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 1.171875 -1.171875 0.390625
</TraceValueList>
</Trace>
<Trace Type="standard" Layer="Es" Polarization="O" Num="24">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
2.75 2.8 2.85 2.9 2.95 3.0 3.05 3.1 3.15 3.2 3.25 3.3 3.35 3.4 3.45 3.5 3.55 3.6 3.65 3.7 3.75 3.8 3.85 3.9
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
105.000 110.000 106.667 103.333 100.000 101.667 103.333 105.000 105.000 105.000 102.500 100.000 105.000 106.000 107.000 108.000 109.000 110.000 110.000 108.750 107.500 106.250 105.000 105.000
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
54 54 0 0 66 0 0 63 54 57 0 0 63 0 0 0 0 0 60 0 0 0 48 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 -0.390625 -0.390625 -0.390625 -0.390625 0.390625 -0.390625 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
</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" >
89.661 90.0 95.0 100.0 105.0 110.0 115.0 116.067 120.0 122.135 125.0 128.202 130.0 135.0 140.0 145.0 150.0 155.0 160.0 165.0 170.0 175.0 180.0 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 401.633 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 1000.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.229 1.614 2.081 2.326 2.404 2.319 2.278 2.278 2.278 2.338 2.404 2.452 2.579 2.701 2.824 2.951 3.084 3.225 3.377 3.541 3.72 3.913 4.121 4.341 4.567 4.794 5.016 5.232 5.438 5.635 5.822 6.001 6.171 6.334 6.491 6.642 6.788 6.929 7.067 7.2 7.33 7.457 7.58 7.702 7.82 7.937 8.051 8.163 8.272 8.38 8.486 8.589 8.69 8.788 8.884 8.976 9.065 9.15 9.229 9.303 9.369 9.427 9.476 9.513 9.538 9.549 9.55 9.549 9.544 9.535 9.522 9.506 9.485 9.462 9.434 9.404 9.371 9.334 9.295 9.252 9.208 9.16 9.111 9.059 9.005 8.949 8.891 8.831 8.769 8.706 8.642 8.576 8.508 8.44 8.37 8.299 8.227 8.155 8.082 8.007 7.933 7.857 7.781 7.705 7.629 7.551 7.474 7.397 7.319 7.241 7.163 7.085 7.008 6.93 6.852 6.775 6.697 6.62 6.543 6.467 6.39 6.314 6.239 6.163 6.089 6.014 5.94 5.867 5.794 5.721 5.649 5.578 5.507 5.437 5.367 5.298 5.229 5.161 5.094 5.027 4.961 4.895 4.83 4.766 4.703 4.64 4.577 4.516 4.455 4.394 4.335 4.276 4.217 4.16 4.102 4.046 3.99 3.935 3.881 3.827 3.774 3.721 3.669 3.618 3.567 3.517 3.468 3.419 3.371 3.323 3.276 3.23 3.184 3.139 3.094 3.05 3.007 2.964 2.921 2.88 2.838 2.798 2.758 2.718 2.679 2.641 2.603

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="2.404" PeakHeight="110.0" Num="3" Error="0.0">
-29.605 11.857 -2.591
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="2.404" EndFrequency="9.55" PeakHeight="401.633" Num="5" zHalfNm="253.775" Error="7.888">
-270.973 -11.263 19.914 -16.778 5.669
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="18.202" Depth="0.126"/>
<TopsideChapman PeakHeight="401.633" PeakDensity="1131544.6" PeakScaleHeight="104.697" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
