<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-04-03 -093 14:30:00.000"
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" >
2026.04.03 (093) 14:30:00</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">
FF202609304031430009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="25" >
<URSI ID="00" Val="13.050" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.527" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="32.982" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="4.550" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="4.550" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="13.400" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="210.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="210.000" 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="0.200" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="12.250" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="500.000" Name="h`(fMUF)" Units="km" QL="/" DL="/" />
<Modeled Name="foEp" Val="3.388" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="4.550" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="4.550" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<Modeled Name="foF1p" Val="4.359" Units="MHz" ModelName="IRI-90" />
<URSI ID="92" Val="376.632" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="283.250" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="7.686" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="123.070" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="64.151" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="68.186" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="166.150" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.110" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="1">
<Trace Type="standard" Layer="F2" Polarization="O" Num="171">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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 11.65 11.7 11.75 11.8 11.85 11.9 11.95 12.0 12.05 12.1 12.15 12.2 12.25 12.3 12.35 12.4 12.45 12.5 12.55 12.6 12.65 12.7 12.75 12.8 12.85 12.9 12.95 13.0 13.05
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
210.000 215.000 220.000 225.000 230.000 235.000 238.333 241.667 245.000 255.000 255.000 258.750 262.500 266.250 270.000 275.000 278.000 281.000 284.000 287.000 290.000 295.000 297.500 300.000 302.500 305.000 310.000 310.000 315.000 315.000 315.000 320.000 322.143 324.286 326.429 328.571 330.714 332.857 335.000 335.000 335.000 335.000 335.000 335.000 335.000 335.000 335.000 335.000 335.000 340.000 340.000 345.000 345.000 345.000 345.000 345.000 345.000 347.143 349.286 351.429 353.571 355.714 357.857 360.000 365.000 365.000 365.000 367.500 370.000 370.000 370.000 370.000 372.500 375.000 375.000 380.000 380.000 385.000 385.000 385.000 390.000 392.500 395.000 395.000 397.500 400.000 400.000 400.000 402.500 405.000 405.000 406.667 408.333 410.000 415.000 415.000 415.000 417.500 420.000 422.500 425.000 427.500 430.000 430.000 430.000 430.000 435.000 435.000 435.000 435.000 437.500 440.000 442.500 445.000 440.000 442.500 445.000 445.000 445.000 450.000 450.000 450.000 450.000 450.000 455.000 456.667 458.333 460.000 460.000 460.000 460.000 460.000 463.333 466.667 470.000 470.000 471.667 473.333 475.000 475.000 475.000 475.000 477.500 480.000 485.000 485.000 487.000 489.000 491.000 493.000 495.000 500.000 500.000 505.000 500.000 510.000 510.000 512.500 515.000 525.000 525.000 527.500 530.000 534.555 539.796 545.888 553.060 561.624 572.032 584.948 601.406
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
45 48 0 45 48 48 0 0 45 48 48 0 51 0 48 45 0 0 0 0 48 48 0 54 0 57 54 60 54 54 51 57 0 0 0 0 0 0 48 54 60 57 0 0 0 0 0 0 45 63 66 63 0 0 0 57 48 0 0 54 0 0 0 60 48 54 60 0 54 60 66 66 0 63 66 66 66 57 63 63 60 45 54 60 0 60 60 63 0 60 63 0 0 60 60 63 60 0 0 51 0 0 51 57 60 60 51 0 57 54 0 54 0 51 54 0 57 57 57 57 0 54 0 45 54 0 0 0 54 54 51 48 0 0 51 54 0 0 51 54 45 51 0 54 54 54 0 0 0 0 51 48 51 48 0 48 54 0 51 42 51 0 48 48 48 51 51 48 45 45 42
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
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</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" >
89.484 90.0 95.0 100.0 105.0 110.0 111.56 113.119 114.679 115.0 120.0 125.0 130.0 135.0 140.0 145.0 150.0 155.0 160.0 165.0 170.0 175.0 180.0 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 376.632 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 1000.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.241 2.279 2.932 3.278 3.388 3.265 3.265 3.388 3.397 3.531 3.667 3.805 3.946 4.088 4.234 4.381 4.531 4.684 4.839 4.996 5.156 5.319 5.484 5.652 5.822 5.994 6.169 6.346 6.526 6.709 6.893 7.08 7.27 7.462 7.656 7.853 8.052 8.254 8.459 8.666 8.876 9.088 9.303 9.521 9.742 9.966 10.192 10.421 10.653 10.887 11.123 11.361 11.599 11.836 12.07 12.297 12.512 12.707 12.871 12.989 13.046 13.05 13.047 13.031 13.003 12.963 12.911 12.849 12.777 12.695 12.604 12.506 12.399 12.286 12.166 12.04 11.909 11.773 11.633 11.489 11.341 11.19 11.036 10.88 10.722 10.563 10.402 10.24 10.077 9.914 9.751 9.588 9.424 9.262 9.099 8.938 8.777 8.618 8.459 8.302 8.147 7.992 7.84 7.689 7.54 7.392 7.247 7.103 6.961 6.822 6.684 6.548 6.415 6.283 6.154 6.026 5.901 5.778 5.657 5.538 5.421 5.306 5.194 5.083 4.974 4.868 4.763 4.661 4.56 4.462 4.365 4.27 4.177 4.086 3.997 3.91 3.824 3.74 3.658 3.577 3.499 3.421 3.346 3.272 3.199 3.129 3.059 2.991 2.925 2.86 2.796 2.734 2.673 2.613 2.555 2.498 2.442 2.387 2.334 2.282 2.23 2.18 2.132 2.084 2.037 1.991 1.947 1.903 1.86 1.818 1.777 1.737 1.698 1.66 1.623 1.586 1.55 1.515 1.481 1.448 1.415 1.383 1.352 1.321 1.292 1.262 1.234

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="3.388" PeakHeight="110.0" Num="3" Error="0.0">
-30.499 13.149 -3.166
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="3.388" EndFrequency="13.05" PeakHeight="376.632" Num="5" zHalfNm="283.25" Error="3.667">
-205.711 -71.919 18.591 -3.418 0.504
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="4.679" Depth="0.123"/>
<TopsideChapman PeakHeight="376.632" PeakDensity="2112934.2" PeakScaleHeight="68.186" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
