<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-04-05 -095 21:10:00.000"
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: Multiple candidates for F2x cusp, Multiple candidates for F2o cusp</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" >
2026.04.05 (095) 21:10:00</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">
FF202609504052110009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="25" >
<URSI ID="00" Val="11.150" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.680" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="29.879" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="2.450" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="2.450" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="11.700" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="285.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="285.000" 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="0.600" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="10.750" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="476.566" 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="0.901" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="2.500" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="2.500" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="378.389" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="313.195" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="8.542" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="94.783" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="32.154" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="48.276" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="99.580" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.680" 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" >
2.45 2.5 2.55 2.6 2.65 2.7 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 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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
290.000 285.000 286.000 287.000 288.000 289.000 290.000 290.000 290.000 290.000 295.000 295.000 295.000 290.000 295.000 295.000 295.000 295.000 295.000 295.000 295.000 295.000 295.000 295.000 295.000 305.000 300.000 301.250 302.500 303.750 305.000 305.556 306.111 306.667 307.222 307.778 308.333 308.889 309.444 310.000 310.000 310.714 311.429 312.143 312.857 313.571 314.286 315.000 315.000 315.000 315.000 317.500 320.000 320.000 320.000 320.000 322.000 324.000 326.000 328.000 330.000 330.000 330.000 330.000 330.000 330.000 330.000 332.500 335.000 335.833 336.667 337.500 338.333 339.167 340.000 340.833 341.667 342.500 343.333 344.167 345.000 345.000 345.000 347.500 350.000 351.250 352.500 353.750 355.000 356.250 357.500 358.750 360.000 360.000 360.000 360.000 360.000 360.000 360.000 365.000 365.000 365.000 365.000 370.000 370.000 370.000 375.000 375.000 375.000 375.000 375.000 380.000 380.000 380.000 385.000 385.000 385.000 385.000 385.000 390.000 390.000 392.500 395.000 395.000 395.000 395.000 400.000 400.000 400.000 402.500 405.000 405.000 410.000 410.000 415.000 415.000 415.000 415.000 420.000 420.000 420.000 425.000 425.000 425.000 430.000 430.000 432.500 435.000 435.000 440.000 440.000 445.000 450.000 450.000 450.000 455.000 455.000 460.000 465.000 465.000 465.000 465.000 467.500 470.000 470.000 472.500 476.566 481.231 486.640 492.985 500.531 509.657 520.916 535.154 553.734
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
57 51 0 63 0 0 60 0 0 54 60 0 54 60 66 0 0 60 60 0 69 0 0 57 57 54 0 0 0 0 66 0 63 0 0 0 0 0 0 51 51 0 0 0 0 0 0 75 57 57 69 0 60 63 69 72 0 0 48 0 54 0 0 0 0 0 69 0 63 0 66 0 0 0 0 69 0 0 0 0 66 0 72 66 66 0 57 0 66 0 48 0 57 63 57 60 0 69 66 63 69 0 63 63 72 75 63 66 72 75 69 69 69 72 63 69 72 75 75 72 72 63 66 66 72 72 66 72 69 60 69 72 66 69 60 60 66 66 63 66 63 60 63 66 66 66 0 66 63 60 57 63 54 60 60 60 60 54 48 51 54 57 51 51 51 0 45 51 51 45 51 48 0 0 0
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
-0.390625 0.390625 -1.171875 -0.390625 -1.171875 -0.390625 -0.390625 -0.390625 -0.390625 -1.171875 -1.171875 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -1.171875 -0.390625 -1.171875 -0.390625 -0.390625 -0.390625 -0.390625 -1.171875 -0.390625 -1.171875 1.953125 -0.390625 -1.171875 -1.171875 -1.171875 -0.390625 -1.171875 -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 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -2.734375 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 2.734375 -1.171875 -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 -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 -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 -1.953125 -1.171875 -1.953125 -1.171875 -1.171875 -1.171875 -1.171875 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.171875 -1.953125 -1.953125 -1.171875 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.171875 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -0.390625 -2.734375 1.171875
</TraceValueList>
</Trace>
</TraceList>
<ProfileList Num="1">
<Profile  Algorithm="NH" AlgorithmVersion="4.33" Type="vertical" >
<Tabulated Num="187">
<AltitudeList Type="float" Units="km" Description="Altitude above station level" >
90.392 95.0 100.0 105.0 110.0 115.0 120.0 125.0 129.893 130.0 135.0 140.0 145.0 149.785 150.0 155.0 160.0 165.0 169.678 170.0 175.0 180.0 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 378.389 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 1000.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.6 0.781 0.872 0.901 0.886 0.84 0.757 0.628 0.628 0.628 0.628 0.628 0.628 0.631 0.7 0.768 0.837 0.901 0.91 1.039 1.155 1.269 1.387 1.51 1.641 1.781 1.932 2.095 2.272 2.465 2.674 2.9 3.143 3.403 3.679 3.969 4.272 4.587 4.91 5.241 5.579 5.92 6.265 6.613 6.962 7.312 7.661 8.01 8.356 8.698 9.035 9.364 9.682 9.985 10.268 10.525 10.749 10.93 11.062 11.135 11.15 11.149 11.13 11.09 11.03 10.953 10.858 10.748 10.625 10.489 10.342 10.186 10.021 9.85 9.671 9.488 9.301 9.11 8.916 8.721 8.524 8.327 8.13 7.933 7.738 7.543 7.351 7.16 6.972 6.786 6.603 6.422 6.245 6.071 5.901 5.734 5.57 5.41 5.253 5.1 4.951 4.805 4.662 4.524 4.389 4.257 4.129 4.004 3.882 3.764 3.649 3.538 3.429 3.324 3.221 3.122 3.025 2.931 2.84 2.752 2.666 2.583 2.502 2.424 2.348 2.275 2.203 2.134 2.067 2.002 1.939 1.878 1.819 1.761 1.706 1.652 1.6 1.549 1.5 1.453 1.407 1.362 1.319 1.277 1.237 1.197 1.159 1.123 1.087 1.052 1.019 0.987 0.955 0.925 0.896 0.867 0.84 0.813 0.787 0.762 0.738 0.714 0.692 0.67 0.648 0.628 0.608 0.588 0.57 0.552 0.534 0.517 0.501 0.485 0.469 0.454 0.44 0.426 0.412 0.399 0.386 0.374 0.362 0.351 0.34 0.329

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="0.901" PeakHeight="110.0" Num="3" Error="0.0">
-26.022 7.502 -1.088
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="0.901" EndFrequency="11.15" PeakHeight="378.389" Num="5" zHalfNm="313.195" Error="3.976">
-189.517 -26.045 8.196 -4.094 2.749
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="59.678" Depth="0.273"/>
<TopsideChapman PeakHeight="378.389" PeakDensity="1542462.8" PeakScaleHeight="48.276" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
