<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-02-25 -056 19:10:00.000"
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: 90% PACIFIC flags: 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) 19:10:00</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">
FF202605602251910009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="25" >
<URSI ID="00" Val="10.300" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.343" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="24.129" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="3.600" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="3.600" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="10.600" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="220.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="220.000" Name="h`F2" 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="8.850" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="490.000" 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="2.717" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="3.600" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="3.600" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="419.819" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="263.713" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="8.593" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="213.395" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="63.609" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="114.344" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="225.270" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.930" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="1">
<Trace Type="standard" Layer="F2" Polarization="O" Num="135">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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 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 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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
220.000 220.000 225.000 230.000 230.000 232.500 235.000 237.500 240.000 242.500 245.000 247.500 250.000 252.500 255.000 257.500 260.000 262.500 265.000 267.500 270.000 272.500 275.000 277.500 280.000 283.750 287.500 291.250 295.000 295.000 300.000 300.000 300.000 300.000 305.000 306.667 308.333 310.000 310.000 312.500 315.000 315.000 320.000 321.875 323.750 325.625 327.500 329.375 331.250 333.125 335.000 337.500 340.000 342.500 345.000 345.000 347.500 350.000 350.000 350.000 350.000 355.000 355.000 360.000 362.500 365.000 365.000 370.000 370.000 370.000 375.000 380.000 380.000 385.000 385.000 387.500 390.000 390.000 395.000 400.000 400.000 405.000 405.000 410.000 410.000 415.000 415.000 420.000 420.000 430.000 430.000 435.000 435.000 445.000 445.000 450.000 455.000 455.000 465.000 470.000 475.000 475.000 485.000 485.000 490.000 490.000 500.000 505.000 510.000 515.000 515.000 520.000 525.000 532.500 540.000 545.000 550.000 555.000 560.000 570.000 575.000 585.000 593.937 603.690 614.377 626.139 639.146 653.607 669.781 687.990 708.645 732.275 759.571 791.458 829.201
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
51 48 51 48 51 0 0 0 45 0 45 0 45 0 0 0 0 0 54 0 54 0 51 0 0 0 0 0 51 57 45 0 0 54 0 0 0 63 0 0 0 57 63 0 0 0 0 0 0 0 0 0 0 0 48 51 0 54 57 45 57 60 63 57 0 54 57 51 60 60 54 45 54 48 57 0 57 60 54 51 60 51 63 60 66 66 69 69 69 69 72 72 69 69 69 72 72 69 69 66 63 69 57 69 69 66 63 54 51 48 60 57 45 0 51 57 54 57 60 60 60 0 63 66 63 57 60 60 57 42 0 48 0 0 0
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
-0.390625 -1.953125 0.390625 -0.390625 0.390625 0.390625 -0.390625 -0.390625 -1.171875 -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 0.390625 -0.390625 0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -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 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" >
89.596 90.0 95.0 100.0 105.0 110.0 114.525 115.0 119.049 120.0 123.574 125.0 130.0 135.0 140.0 145.0 150.0 155.0 160.0 165.0 170.0 175.0 180.0 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 419.819 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 1000.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.233 1.825 2.352 2.629 2.717 2.594 2.594 2.594 2.62 2.717 2.76 2.903 3.038 3.171 3.304 3.439 3.577 3.719 3.866 4.019 4.177 4.34 4.51 4.684 4.862 5.044 5.228 5.413 5.599 5.783 5.966 6.147 6.325 6.5 6.672 6.84 7.005 7.166 7.323 7.478 7.629 7.777 7.921 8.062 8.201 8.336 8.468 8.597 8.723 8.846 8.965 9.082 9.195 9.304 9.41 9.511 9.608 9.701 9.789 9.871 9.947 10.018 10.081 10.138 10.186 10.227 10.259 10.282 10.296 10.3 10.3 10.298 10.292 10.283 10.27 10.253 10.234 10.211 10.185 10.156 10.124 10.09 10.053 10.013 9.971 9.926 9.879 9.83 9.779 9.726 9.671 9.615 9.557 9.497 9.435 9.373 9.308 9.243 9.177 9.109 9.04 8.971 8.9 8.829 8.757 8.684 8.61 8.536 8.462 8.387 8.312 8.236 8.16 8.084 8.007 7.93 7.854 7.777 7.7 7.623 7.546 7.469 7.393 7.316 7.24 7.163 7.087 7.012 6.936 6.861 6.786 6.711 6.637 6.563 6.49 6.417 6.344 6.272 6.2 6.129 6.058 5.988 5.918 5.848 5.78 5.711 5.644 5.576 5.51 5.444 5.378 5.313 5.249 5.185 5.122 5.059 4.997 4.936 4.875 4.814 4.755 4.696 4.637 4.579 4.522 4.465 4.409 4.353 4.298 4.244 4.19 4.137 4.084 4.032 3.98 3.929 3.879 3.829 3.78 3.731 3.683 3.636 3.589 3.542 3.496 3.451 3.406

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="2.717" PeakHeight="110.0" Num="3" Error="0.0">
-29.938 12.33 -2.796
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="2.717" EndFrequency="10.3" PeakHeight="419.819" Num="5" zHalfNm="263.713" Error="7.508">
-295.313 -6.0 9.272 -7.368 3.164
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="13.574" Depth="0.123"/>
<TopsideChapman PeakHeight="419.819" PeakDensity="1316253.1" PeakScaleHeight="114.344" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
