<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-03-25 -084 19:30:00.000"
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" >
2026.03.25 (084) 19:30:00</StartTime>
<SolarTerrestrialData>
<GyroFrequency Val="0.63" Model="IGRF 3.0" Altitude="300"/>
<DipAngle Val="-11.18" 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">
FF202608403251930009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="24" >
<URSI ID="00" Val="12.500" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.603" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="32.534" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="3.400" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="3.400" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="12.800" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="225.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="225.000" 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="11.400" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="455.000" Name="h`(fMUF)" Units="km" QL="/" DL="/" />
<Modeled Name="foEp" Val="2.508" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="3.400" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="3.400" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="369.849" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="281.061" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="9.683" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="122.581" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="55.350" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="65.229" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="142.870" 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="183">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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 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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
225.000 230.000 230.000 230.000 235.000 235.000 235.000 235.000 240.000 242.500 245.000 245.000 246.250 247.500 248.750 250.000 253.333 256.667 260.000 261.250 262.500 263.750 265.000 265.000 265.000 270.000 270.000 270.000 270.000 275.000 275.000 275.000 276.667 278.333 280.000 280.000 282.500 285.000 285.000 285.000 285.000 290.000 290.000 290.000 295.000 295.000 295.000 295.000 300.000 300.000 300.000 300.000 305.000 310.000 310.000 310.000 310.000 310.000 315.000 315.000 315.000 317.500 320.000 320.000 320.000 320.000 325.000 325.000 327.000 329.000 331.000 333.000 335.000 335.000 335.000 335.000 340.000 340.000 340.000 340.000 345.000 345.000 345.000 347.500 350.000 350.000 350.000 355.000 355.000 355.000 360.000 360.000 360.000 362.500 365.000 365.000 367.500 370.000 370.000 375.000 375.000 375.000 375.000 380.000 380.000 380.000 385.000 385.000 385.000 385.000 385.000 385.000 390.000 390.000 390.000 390.000 390.000 392.500 395.000 400.000 397.500 395.000 400.000 400.000 400.000 400.000 400.000 405.000 405.000 407.500 410.000 410.000 410.000 410.000 410.000 415.000 415.000 415.000 415.000 415.000 420.000 421.667 423.333 425.000 427.500 430.000 432.500 435.000 430.000 435.000 435.000 440.000 442.500 445.000 450.000 450.000 450.000 452.500 455.000 460.000 455.000 458.750 462.500 466.250 470.000 475.000 480.000 480.000 485.000 490.000 495.000 500.000 505.833 511.667 517.500 523.333 529.167 535.000 544.174 554.515 566.259 579.714 595.282
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
60 60 60 57 60 0 63 54 0 0 0 60 0 0 0 60 0 0 54 0 0 0 66 66 66 60 0 60 60 60 60 54 0 0 60 60 0 60 63 54 54 60 48 60 63 0 66 60 57 57 57 57 60 48 48 0 0 57 51 0 57 51 57 0 60 63 60 63 0 54 0 0 48 54 66 69 57 60 63 66 63 69 75 63 69 69 72 66 72 72 54 54 54 0 57 63 0 63 66 54 60 69 69 60 60 66 57 63 69 72 72 72 69 72 72 72 69 0 69 57 0 66 66 0 66 0 57 66 63 0 60 63 0 63 63 60 60 48 57 57 60 0 0 60 0 51 0 45 54 57 57 54 0 51 42 48 51 0 51 48 0 48 0 0 51 51 51 51 0 45 0 54 0 0 0 0 0 54 54 0 51 51 48
</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" >
89.638 90.0 95.0 100.0 105.0 110.0 115.0 115.545 120.0 121.089 125.0 126.634 130.0 135.0 140.0 145.0 150.0 155.0 160.0 165.0 170.0 175.0 180.0 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 369.849 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 1000.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.23 1.684 2.171 2.427 2.508 2.407 2.384 2.384 2.384 2.471 2.508 2.594 2.725 2.859 2.998 3.141 3.289 3.444 3.604 3.771 3.945 4.125 4.313 4.507 4.707 4.914 5.128 5.347 5.571 5.8 6.034 6.272 6.513 6.757 7.004 7.254 7.505 7.758 8.013 8.269 8.526 8.784 9.042 9.301 9.56 9.818 10.076 10.331 10.585 10.835 11.081 11.32 11.549 11.766 11.966 12.144 12.293 12.406 12.477 12.5 12.5 12.493 12.471 12.437 12.391 12.333 12.265 12.186 12.098 12.001 11.896 11.784 11.665 11.539 11.408 11.272 11.131 10.986 10.838 10.686 10.532 10.375 10.216 10.056 9.895 9.732 9.569 9.405 9.242 9.078 8.915 8.753 8.591 8.43 8.27 8.111 7.954 7.798 7.644 7.491 7.34 7.191 7.044 6.899 6.756 6.614 6.475 6.338 6.204 6.071 5.941 5.812 5.686 5.562 5.441 5.321 5.204 5.089 4.976 4.865 4.757 4.65 4.546 4.444 4.343 4.245 4.149 4.055 3.963 3.872 3.784 3.697 3.613 3.53 3.449 3.369 3.292 3.216 3.141 3.069 2.998 2.928 2.86 2.794 2.729 2.666 2.603 2.543 2.484 2.426 2.369 2.314 2.26 2.207 2.155 2.105 2.055 2.007 1.96 1.914 1.869 1.825 1.782 1.74 1.7 1.66 1.621 1.582 1.545 1.509 1.473 1.439 1.405 1.372 1.339 1.308 1.277 1.247 1.217 1.189 1.161 1.133 1.106 1.08 1.055 1.03 1.006

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="2.508" PeakHeight="110.0" Num="3" Error="0.0">
-29.724 12.024 -2.662
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="2.508" EndFrequency="12.5" PeakHeight="369.849" Num="5" zHalfNm="281.061" Error="3.407">
-206.771 -45.491 12.654 -4.919 1.312
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="16.634" Depth="0.124"/>
<TopsideChapman PeakHeight="369.849" PeakDensity="1938585.6" PeakScaleHeight="65.229" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
