<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-04-05 -095 18:50:00.000"
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="1 2 0 0 0 0 0 0 0 11 0 0 0 0 0 0 0 0 0 0 "/>
<Comments>AR.5002.44 Confidence: 90% PACIFIC flags: 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" >
2026.04.05 (095) 18:50:00</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">
FF202609504051850009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="27" >
<URSI ID="00" Val="11.500" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.576" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="29.624" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="2.550" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="4.200" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="81" Val="2.550" Name="fminE" Units="MHz" QL="/" DL="/" />
<URSI ID="20" Val="2.710" Name="foE" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="11.800" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="255.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="255.000" Name="h`F2" Units="km" QL="/" DL="/" />
<URSI ID="24" Val="109.649" Name="h`E" Units="km" QL="/" DL="/" />
<URSI ID="90" Val="100.907" Name="hmE" Units="km" QL="/" DL="/" />
<URSI ID="83" Val="10.693" Name="yE" Units="km" QL="/" DL="/" />
<URSI ID="86" Val="0.100" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="10.450" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="460.000" Name="h`(fMUF)" Units="km" QL="/" DL="/" />
<Modeled Name="foEp" Val="2.763" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="4.200" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="4.200" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="362.320" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="270.268" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="9.553" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="123.875" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="48.428" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="66.902" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="154.400" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.270" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="2">
<Trace Type="standard" Layer="F2" Polarization="O" Num="147">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
255.000 255.000 260.000 262.000 264.000 266.000 268.000 270.000 271.667 273.333 275.000 275.000 280.000 280.000 281.667 283.333 285.000 285.000 290.000 290.000 290.000 295.000 296.250 297.500 298.750 300.000 302.500 305.000 307.500 310.000 310.000 310.000 310.000 310.000 310.000 315.000 315.000 315.000 320.000 322.500 325.000 325.000 325.000 330.000 330.000 330.000 330.000 332.500 335.000 336.667 338.333 340.000 340.000 340.000 340.000 342.500 345.000 350.000 350.000 350.000 350.000 355.000 355.000 355.000 355.000 360.000 360.000 360.000 365.000 365.000 365.000 365.000 370.000 370.000 372.500 375.000 375.000 377.500 380.000 382.500 385.000 385.000 385.000 385.000 390.000 390.000 395.000 395.000 400.000 400.000 400.000 405.000 405.000 410.000 410.000 410.000 410.000 415.000 417.500 420.000 420.000 420.000 420.000 420.000 425.000 425.000 430.000 430.000 430.000 430.000 430.000 432.500 435.000 437.500 440.000 440.000 450.000 451.250 452.500 453.750 455.000 455.000 455.000 457.500 460.000 460.000 470.000 473.333 476.667 480.000 485.000 487.500 490.000 495.000 495.000 500.000 505.000 510.000 515.000 520.000 525.000 530.000 535.000 543.622 553.926 566.459 582.031
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
48 60 54 0 0 0 0 45 0 0 57 57 51 54 0 0 57 54 63 60 57 0 0 0 0 63 0 0 0 0 63 60 0 0 51 69 69 66 66 0 0 0 60 57 0 0 72 54 57 0 0 69 72 54 69 0 66 51 0 69 69 57 0 57 54 57 66 69 57 63 0 69 63 66 54 60 63 0 54 0 51 57 60 66 63 69 63 60 57 72 75 66 72 63 63 0 75 69 51 63 66 45 60 60 63 66 57 0 66 0 66 48 63 0 57 60 51 0 0 0 57 60 57 0 57 51 54 0 0 54 51 0 45 48 48 48 48 0 0 0 45 0 51 48 48 48 42
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
-0.390625 -0.390625 -0.390625 1.171875 -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 -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 -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 2.734375 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 -0.390625 0.390625 1.171875 0.390625 0.390625 -1.953125 -0.390625 0.390625 0.390625 0.390625 0.390625 2.734375 0.390625 -1.171875 0.390625 1.953125 0.390625 0.390625 0.390625 0.390625 0.390625
</TraceValueList>
</Trace>
<Trace Type="standard" Layer="E" Polarization="O" Num="4">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
2.55 2.6 2.65 2.7
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
109.649 112.625 116.009 119.940
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
51 0 0 51
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
-0.390625 -1.171875 -0.390625 -0.390625
</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" >
90.0 95.0 100.0 100.907 105.0 105.211 109.514 110.0 113.818 115.0 120.0 125.0 130.0 135.0 140.0 145.0 150.0 155.0 160.0 165.0 170.0 175.0 180.0 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 362.32 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 1000.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 2.26 2.7 2.71 2.602 2.59 2.59 2.604 2.71 2.744 2.883 3.018 3.151 3.284 3.418 3.554 3.692 3.834 3.98 4.129 4.283 4.441 4.604 4.771 4.943 5.119 5.299 5.484 5.672 5.864 6.059 6.256 6.457 6.659 6.864 7.07 7.278 7.487 7.697 7.908 8.12 8.333 8.546 8.76 8.974 9.188 9.402 9.616 9.83 10.042 10.253 10.46 10.662 10.856 11.039 11.203 11.341 11.441 11.494 11.5 11.498 11.486 11.461 11.426 11.38 11.325 11.26 11.186 11.105 11.016 10.92 10.818 10.71 10.596 10.478 10.355 10.229 10.098 9.965 9.829 9.69 9.55 9.408 9.264 9.119 8.973 8.827 8.681 8.534 8.387 8.241 8.095 7.949 7.805 7.661 7.518 7.377 7.236 7.097 6.959 6.823 6.689 6.556 6.425 6.295 6.167 6.041 5.917 5.795 5.675 5.556 5.44 5.325 5.212 5.101 4.993 4.886 4.781 4.677 4.576 4.477 4.38 4.284 4.19 4.098 4.008 3.92 3.833 3.748 3.665 3.584 3.504 3.426 3.349 3.275 3.201 3.129 3.059 2.99 2.923 2.857 2.793 2.73 2.668 2.607 2.548 2.491 2.434 2.379 2.325 2.272 2.22 2.17 2.12 2.072 2.025 1.978 1.933 1.889 1.846 1.804 1.762 1.722 1.683 1.644 1.606 1.569 1.533 1.498 1.464 1.43 1.398 1.365 1.334 1.303 1.273 1.244 1.216 1.188 1.16 1.134 1.108 1.082 1.057 1.033 1.009 0.986 0.963

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="2.71" PeakHeight="100.907" Num="3" Error="2.556">
-16.002 6.587 -1.492
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="2.71" EndFrequency="11.5" PeakHeight="362.32" Num="5" zHalfNm="270.268" Error="3.583">
-203.963 -58.168 16.888 -5.356 2.097
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="12.911" Depth="0.12"/>
<TopsideChapman PeakHeight="362.32" PeakDensity="1640818.9" PeakScaleHeight="66.902" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
