<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-04-01 -091 20:50:00.000"
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 33 0 0 0 0 0 0 0 0 1 0 "/>
<Comments>AR.5002.44 Confidence: 65% PACIFIC flags: Multiple candidates for F2x cusp, One of F2 cusps was derived from the other, Unidentified traces above foF2</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" >
2026.04.01 (091) 20:50:00</StartTime>
<SolarTerrestrialData>
<GyroFrequency Val="0.63" Model="IGRF 3.0" Altitude="300"/>
<DipAngle Val="-11.19" 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">
FF202609104012050009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="25" >
<URSI ID="00" Val="11.600" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.755" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="31.963" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="2.900" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="2.900" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="12.000" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="265.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="265.000" 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="0.300" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="11.200" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="455.000" 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="1.370" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="2.900" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="2.900" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="348.686" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="285.292" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="8.571" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="90.869" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="33.606" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="45.724" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="101.500" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.440" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="1">
<Trace Type="standard" Layer="F2" Polarization="O" Num="175">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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 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 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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
265.000 265.000 265.000 265.000 270.000 270.000 270.000 265.000 265.000 267.500 270.000 270.000 270.000 270.000 270.000 270.000 270.000 270.833 271.667 272.500 273.333 274.167 275.000 280.000 280.000 280.000 280.000 280.000 282.500 285.000 283.333 281.667 280.000 280.000 281.667 283.333 285.000 285.000 285.000 286.000 287.000 288.000 289.000 290.000 291.000 292.000 293.000 294.000 295.000 295.000 295.000 295.000 295.000 297.500 300.000 302.500 305.000 305.000 305.000 305.000 305.000 310.000 310.000 310.000 310.000 305.000 307.500 310.000 310.000 311.000 312.000 313.000 314.000 315.000 316.250 317.500 318.750 320.000 322.500 325.000 327.500 330.000 330.000 330.000 331.250 332.500 333.750 335.000 335.000 335.000 335.000 335.000 340.000 340.000 340.000 340.000 342.500 345.000 345.000 345.000 345.000 350.000 350.000 355.000 355.000 355.000 355.000 355.000 355.000 360.000 360.000 360.000 365.000 365.000 365.000 370.000 370.000 370.000 370.000 370.000 370.000 375.000 375.000 375.000 375.000 380.000 385.000 385.000 385.000 385.000 390.000 390.000 390.000 395.000 395.000 397.500 400.000 400.000 400.000 402.500 405.000 400.000 410.000 410.000 412.500 415.000 415.000 415.000 420.000 425.000 425.000 425.000 425.000 427.500 430.000 425.000 432.500 440.000 441.250 442.500 443.750 445.000 450.000 450.000 450.000 452.500 455.000 465.000 465.000 465.000 469.821 475.274 481.492 488.650 496.976
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
69 69 63 66 60 0 60 60 66 0 66 72 69 69 69 69 66 0 60 0 0 0 60 0 0 0 0 0 0 0 0 0 69 63 0 0 69 69 66 0 0 0 0 0 0 0 0 0 69 69 72 63 69 0 0 0 60 66 0 69 72 57 0 0 66 0 0 69 72 0 69 0 0 72 0 72 54 72 0 66 0 57 0 63 0 51 0 63 66 72 72 69 66 69 72 72 66 69 72 0 75 69 72 60 63 0 69 69 75 69 51 72 63 66 69 57 63 66 69 57 72 69 66 60 66 66 57 63 66 69 60 0 69 60 63 0 57 60 63 0 57 0 54 57 0 51 57 60 57 45 51 57 57 0 57 48 0 48 0 0 0 51 51 0 54 0 0 48 54 51 51 48 45 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 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -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 -0.390625 -1.171875 -0.390625 -1.171875 -1.171875 -0.390625 -0.390625 -0.390625 -1.171875 -0.390625 -1.171875 -0.390625 -1.171875 1.953125 -1.171875 -1.171875 -1.171875 -0.390625 -1.171875 -0.390625 -0.390625 -1.171875 -1.171875 -0.390625 1.953125 -0.390625 -0.390625 -1.953125 -0.390625 -1.171875 -1.171875 -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 -0.390625 -1.171875
</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" >
89.999 90.0 95.0 100.0 105.0 110.0 115.0 120.0 122.267 125.0 130.0 134.533 135.0 140.0 145.0 146.8 150.0 155.0 160.0 165.0 170.0 175.0 180.0 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 348.686 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 1000.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.2 0.915 1.187 1.326 1.37 1.346 1.27 1.217 1.217 1.217 1.217 1.223 1.285 1.348 1.37 1.468 1.607 1.741 1.876 2.017 2.165 2.322 2.492 2.675 2.874 3.09 3.323 3.573 3.84 4.122 4.415 4.718 5.028 5.342 5.658 5.975 6.292 6.609 6.925 7.24 7.555 7.87 8.184 8.498 8.813 9.127 9.442 9.756 10.069 10.377 10.678 10.965 11.224 11.435 11.569 11.6 11.599 11.579 11.534 11.467 11.378 11.271 11.146 11.006 10.852 10.687 10.51 10.325 10.132 9.932 9.728 9.519 9.307 9.092 8.876 8.66 8.443 8.228 8.013 7.8 7.589 7.38 7.174 6.971 6.772 6.576 6.383 6.194 6.01 5.829 5.652 5.48 5.312 5.147 4.987 4.831 4.68 4.532 4.388 4.249 4.113 3.981 3.853 3.729 3.608 3.491 3.378 3.268 3.161 3.058 2.958 2.861 2.767 2.676 2.588 2.502 2.419 2.339 2.262 2.187 2.114 2.044 1.976 1.911 1.847 1.786 1.726 1.669 1.613 1.559 1.507 1.457 1.408 1.361 1.315 1.271 1.229 1.188 1.148 1.11 1.072 1.037 1.002 0.968 0.936 0.904 0.874 0.845 0.816 0.789 0.763 0.737 0.712 0.688 0.665 0.643 0.621 0.601 0.58 0.561 0.542 0.524 0.506 0.489 0.473 0.457 0.442 0.427 0.412 0.399 0.385 0.372 0.36 0.348 0.336 0.325 0.314 0.303 0.293 0.283 0.274 0.265 0.256 0.247 0.239 0.231 0.223

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="1.37" PeakHeight="110.0" Num="3" Error="0.0">
-27.794 9.48 -1.687
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="1.37" EndFrequency="11.6" PeakHeight="348.686" Num="5" zHalfNm="285.292" Error="4.761">
-172.653 -40.659 16.487 -8.854 3.793
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="36.8" Depth="0.153"/>
<TopsideChapman PeakHeight="348.686" PeakDensity="1669478.9" PeakScaleHeight="45.724" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
