<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-04-05 -095 19:50:00.000"
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: 100%</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) 19:50:00</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">
FF202609504051950009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="27" >
<URSI ID="00" Val="12.200" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.576" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="31.428" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="2.050" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="2.800" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="81" Val="2.050" Name="fminE" Units="MHz" QL="/" DL="/" />
<URSI ID="20" Val="2.310" Name="foE" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="12.550" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="245.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="245.000" Name="h`F2" Units="km" QL="/" DL="/" />
<URSI ID="24" Val="98.458" Name="h`E" Units="km" QL="/" DL="/" />
<URSI ID="90" Val="98.190" Name="hmE" Units="km" QL="/" DL="/" />
<URSI ID="83" Val="8.293" Name="yE" Units="km" QL="/" DL="/" />
<URSI ID="86" Val="0.100" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="11.600" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="497.459" Name="h`(fMUF)" Units="km" QL="/" DL="/" />
<Modeled Name="foEp" Val="2.277" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="2.850" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="2.850" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="375.483" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="281.728" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="8.864" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="130.265" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="55.097" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="68.813" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="139.100" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.740" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="2">
<Trace Type="standard" Layer="F2" Polarization="O" Num="189">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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 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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
250.000 245.000 245.000 245.000 245.000 245.000 245.000 245.000 250.000 250.000 250.000 250.000 250.000 250.000 250.000 255.000 255.000 255.000 255.000 255.000 260.000 260.000 260.000 260.000 260.000 261.667 263.333 265.000 265.000 265.000 267.500 270.000 270.000 270.000 270.000 270.000 271.667 273.333 275.000 278.333 281.667 285.000 285.000 285.000 285.000 290.000 290.000 290.000 290.000 290.000 295.000 295.000 295.000 295.000 295.000 296.667 298.333 300.000 300.000 305.000 305.000 305.000 306.667 308.333 310.000 310.000 310.000 310.000 311.667 313.333 315.000 316.667 318.333 320.000 321.667 323.333 325.000 325.000 327.500 330.000 330.000 330.000 330.000 330.000 335.000 335.000 335.000 337.500 340.000 342.500 345.000 345.000 345.000 345.000 350.000 350.000 350.000 355.000 355.000 355.000 355.000 357.500 360.000 360.000 360.000 365.000 365.000 365.000 365.000 370.000 370.000 370.000 372.500 375.000 375.000 375.000 380.000 380.000 380.000 380.000 385.000 385.000 390.000 390.000 390.000 392.500 395.000 395.000 395.000 395.000 397.500 400.000 400.000 402.500 405.000 405.000 405.000 405.000 407.500 410.000 415.000 415.000 415.000 420.000 420.000 420.000 420.000 420.000 425.000 430.000 430.000 430.000 432.500 435.000 437.500 440.000 440.000 442.500 445.000 445.000 450.000 450.000 450.000 455.000 460.000 460.000 465.000 465.000 470.000 475.000 478.333 481.667 485.000 485.000 490.000 493.545 497.459 501.802 506.648 512.091 518.248 525.269 533.351 542.752 553.824 567.058 583.154 603.153 628.672
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
48 51 0 0 57 57 57 54 57 57 54 0 63 54 57 66 60 69 69 66 66 0 0 48 51 0 0 63 63 63 0 57 63 0 0 48 45 0 60 0 0 0 0 0 72 63 63 0 72 72 66 69 69 66 63 0 0 0 69 69 51 72 0 0 72 75 75 69 0 48 54 0 0 0 48 0 63 66 0 60 0 66 72 66 66 69 69 0 66 0 54 60 66 69 57 60 72 57 63 69 69 57 63 66 72 60 63 45 75 66 72 72 57 66 69 72 63 63 63 66 66 69 60 69 72 51 63 63 63 63 54 63 69 0 66 0 63 63 0 57 51 60 63 54 0 63 0 63 63 48 51 54 0 0 0 48 54 0 54 57 54 0 54 54 54 54 51 48 57 51 0 0 51 54 54 51 54 0 48 0 0 0 60 0 54 54 51 42 0
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
1.171875 0.390625 -0.390625 -2.734375 -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 1.953125 -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 -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 -1.953125 -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 -0.390625 -2.734375 -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 -1.953125 -2.734375 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 -1.953125 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -2.734375 -1.953125 -2.734375 -0.390625 -1.953125 -0.390625 -0.390625 -0.390625 -0.390625 -2.734375
</TraceValueList>
</Trace>
<Trace Type="standard" Layer="E" Polarization="O" Num="6">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
2.05 2.1 2.15 2.2 2.25 2.3
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
98.458 100.774 103.368 106.320 109.750 113.857
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
54 0 0 54 0 48
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
-0.390625 0.390625 0.390625 0.390625 -0.390625 1.171875
</TraceValueList>
</Trace>
</TraceList>
<ProfileList Num="1">
<Profile  Algorithm="NH" AlgorithmVersion="4.33" Type="vertical" >
<Tabulated Num="189">
<AltitudeList Type="float" Units="km" Description="Altitude above station level" >
89.765 90.0 95.0 98.19 100.0 104.91 105.0 110.0 111.631 115.0 118.351 120.0 125.0 130.0 135.0 140.0 145.0 150.0 155.0 160.0 165.0 170.0 175.0 180.0 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 375.483 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 1000.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.258 2.13 2.31 2.301 2.181 2.181 2.181 2.181 2.246 2.31 2.337 2.42 2.507 2.597 2.693 2.793 2.899 3.011 3.13 3.256 3.391 3.535 3.688 3.853 4.028 4.215 4.414 4.626 4.849 5.083 5.327 5.58 5.84 6.105 6.374 6.645 6.918 7.191 7.463 7.734 8.004 8.271 8.536 8.798 9.058 9.314 9.567 9.816 10.062 10.302 10.538 10.767 10.988 11.2 11.4 11.587 11.756 11.903 12.026 12.118 12.177 12.2 12.2 12.195 12.178 12.149 12.11 12.06 12.001 11.932 11.855 11.77 11.678 11.578 11.472 11.361 11.244 11.122 10.996 10.865 10.731 10.594 10.454 10.312 10.167 10.021 9.873 9.724 9.574 9.423 9.272 9.121 8.97 8.818 8.668 8.517 8.368 8.219 8.071 7.924 7.779 7.634 7.491 7.35 7.209 7.071 6.934 6.799 6.666 6.534 6.404 6.276 6.15 6.026 5.903 5.783 5.665 5.548 5.434 5.321 5.21 5.101 4.994 4.889 4.786 4.685 4.586 4.488 4.393 4.299 4.207 4.117 4.028 3.941 3.856 3.773 3.691 3.611 3.533 3.456 3.38 3.307 3.234 3.164 3.094 3.027 2.96 2.895 2.831 2.769 2.708 2.648 2.59 2.533 2.477 2.422 2.368 2.316 2.265 2.214 2.165 2.117 2.07 2.024 1.979 1.935 1.892 1.85 1.809 1.769 1.729 1.691 1.653 1.616 1.58 1.545 1.51 1.477 1.444 1.411 1.38 1.349 1.319 1.289 1.26 1.232 1.205 1.178

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="2.31" PeakHeight="98.19" Num="3" Error="1.423">
-12.229 4.851 -1.047
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="2.31" EndFrequency="12.2" PeakHeight="375.483" Num="5" zHalfNm="281.728" Error="4.307">
-217.522 -38.938 4.978 -7.736 2.086
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="20.161" Depth="0.129"/>
<TopsideChapman PeakHeight="375.483" PeakDensity="1846650.1" PeakScaleHeight="68.813" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
