<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-04-03 -093 21:30:00.000"
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 F2o 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) 21:30:00</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">
FF202609304032130009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="24" >
<URSI ID="00" Val="10.450" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.392" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="24.993" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="2.500" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="2.500" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="10.750" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="360.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="360.000" 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="0.250" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="10.200" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="581.429" Name="h`(fMUF)" Units="km" QL="/" DL="/" />
<Modeled Name="foEp" Val="0.568" 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="458.419" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="392.258" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="8.497" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="98.836" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="29.242" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="48.981" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="110.390" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.330" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="1">
<Trace Type="standard" Layer="F2" Polarization="O" Num="160">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
360.000 360.000 360.000 360.000 360.000 360.000 360.000 360.000 360.000 365.000 365.000 365.000 367.500 370.000 370.714 371.429 372.143 372.857 373.571 374.286 375.000 375.000 375.000 375.000 380.000 380.000 380.000 380.000 385.000 386.250 387.500 388.750 390.000 385.000 385.000 390.000 391.667 393.333 395.000 395.000 396.667 398.333 400.000 401.000 402.000 403.000 404.000 405.000 400.000 402.500 405.000 407.500 410.000 412.500 415.000 415.000 415.000 415.000 415.000 415.000 417.500 420.000 420.000 420.000 422.500 425.000 425.000 425.000 426.875 428.750 430.625 432.500 434.375 436.250 438.125 440.000 441.429 442.857 444.286 445.714 447.143 448.571 450.000 450.000 451.250 452.500 453.750 455.000 456.000 457.000 458.000 459.000 460.000 465.000 465.000 465.000 470.000 470.000 470.000 470.000 475.000 475.000 475.000 480.000 480.000 480.000 485.000 485.000 485.000 485.000 490.000 490.000 495.000 495.000 495.000 495.000 496.667 498.333 500.000 505.000 505.000 507.000 509.000 511.000 513.000 515.000 520.000 520.000 522.500 525.000 525.000 530.000 530.000 530.000 530.000 535.000 535.000 540.000 545.000 545.000 550.000 550.000 550.000 555.000 560.000 560.000 560.000 560.000 560.000 563.571 567.143 570.714 574.286 577.857 581.429 585.000 590.305 596.897 605.308 616.412
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
0 0 0 0 0 0 0 0 60 69 0 69 0 0 0 0 0 0 0 0 69 69 69 69 66 69 69 66 63 0 48 0 54 66 69 72 0 0 66 0 0 0 0 0 0 0 0 60 0 0 66 0 63 0 51 54 0 63 0 0 60 66 51 0 0 66 69 60 0 66 0 0 0 63 0 54 0 0 57 0 63 0 51 60 0 0 0 60 0 51 57 0 69 54 0 66 51 0 66 66 57 63 66 54 63 69 54 60 48 69 63 66 54 0 69 69 0 0 69 60 63 0 0 48 0 66 54 60 0 57 63 51 60 66 66 63 60 63 54 60 51 60 63 0 54 60 57 60 0 57 0 48 0 0 0 0 45 45 48 45
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
-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 -1.171875 -1.171875 -1.171875 -1.953125 -1.171875 -1.953125 -1.953125 -1.171875 -1.953125 -1.953125 -1.171875 -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 -1.171875 -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 -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 -1.953125 -2.734375 -1.953125 -2.734375 -2.734375 -2.734375 -2.734375 -2.734375 -2.734375 -2.734375 -2.734375 -2.734375 -2.734375 -2.734375 -2.734375 -2.734375 -2.734375 -2.734375 -2.734375 -2.734375 -2.734375 -2.734375 -2.734375 -2.734375 -2.734375 -2.734375 -2.734375 -2.734375 -2.734375 -2.734375 -2.734375 -2.734375 -2.734375 -2.734375 -2.734375 -2.734375 -2.734375 -2.734375 -2.734375 -2.734375 -2.734375 -2.734375 -2.734375 -2.734375 -2.734375 -2.734375 -2.734375 -2.734375 -2.734375
</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" >
91.243 95.0 100.0 105.0 110.0 115.0 120.0 125.0 130.0 135.0 136.988 140.0 145.0 150.0 155.0 160.0 163.977 165.0 170.0 175.0 180.0 185.0 190.0 190.965 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 458.419 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 1000.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.376 0.492 0.55 0.568 0.56 0.536 0.493 0.427 0.32 0.255 0.255 0.255 0.255 0.255 0.255 0.255 0.267 0.325 0.383 0.441 0.499 0.557 0.568 0.655 0.74 0.818 0.896 0.975 1.056 1.14 1.228 1.32 1.418 1.521 1.629 1.744 1.866 1.994 2.129 2.272 2.421 2.578 2.742 2.913 3.09 3.275 3.466 3.663 3.866 4.075 4.29 4.51 4.736 4.967 5.203 5.444 5.69 5.941 6.197 6.457 6.722 6.991 7.264 7.542 7.822 8.106 8.391 8.677 8.961 9.241 9.512 9.768 10.0 10.198 10.346 10.432 10.45 10.449 10.432 10.396 10.341 10.27 10.184 10.084 9.971 9.847 9.713 9.57 9.419 9.261 9.098 8.929 8.757 8.581 8.403 8.223 8.041 7.86 7.677 7.496 7.314 7.134 6.956 6.779 6.604 6.431 6.261 6.094 5.929 5.767 5.608 5.452 5.299 5.149 5.003 4.859 4.72 4.583 4.449 4.319 4.192 4.069 3.948 3.831 3.716 3.605 3.497 3.392 3.289 3.19 3.093 2.999 2.908 2.819 2.733 2.649 2.568 2.489 2.412 2.338 2.266 2.196 2.128 2.062 1.998 1.937 1.876 1.818 1.762 1.707 1.654 1.602 1.553 1.504 1.457 1.412 1.368 1.325 1.284 1.244 1.205 1.167 1.131 1.095 1.061 1.028 0.996 0.965 0.934 0.905 0.877 0.849 0.823 0.797 0.772 0.748 0.724 0.702 0.68 0.658 0.638 0.618 0.598 0.58 0.561 0.544

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="0.568" PeakHeight="110.0" Num="3" Error="0.0">
-23.285 5.05 -0.522
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="0.568" EndFrequency="10.45" PeakHeight="458.419" Num="5" zHalfNm="392.258" Error="4.639">
-231.795 -56.301 23.412 -6.346 3.576
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="80.965" Depth="0.313"/>
<TopsideChapman PeakHeight="458.419" PeakDensity="1354869.8" PeakScaleHeight="48.981" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
