<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-03-20 -079 23:50:00.000"
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="2 2 0 0 0 0 0 0 0 55 0 0 0 0 0 0 0 0 1 0 "/>
<Comments>AR.5002.44 Confidence: 20% PACIFIC flags: F2x cusp not found, Multiple candidates for F2x cusp, Multiple candidates for F2o cusp, One of F2 cusps was derived from the other, Unidentified traces above foF2, Trace overlaps while constructing baseline</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" >
2026.03.20 (079) 23:50:00</StartTime>
<SolarTerrestrialData>
<GyroFrequency Val="0.63" Model="IGRF 3.0" Altitude="300"/>
<DipAngle Val="-11.17" 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">
FF202607903202350009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="24" >
<URSI ID="00" Val="7.000" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.425" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="16.974" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="2.150" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="2.150" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="7.300" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="440.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="440.000" 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="6.850" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="571.762" Name="h`(fMUF)" Units="km" QL="/" DL="/" />
<Modeled Name="foEp" Val="0.354" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="2.400" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="2.400" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="488.973" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="443.511" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="7.591" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="69.801" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="9.864" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="35.653" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="94.220" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.000" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="1">
<Trace Type="standard" Layer="F2" Polarization="O" Num="98">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
2.15 2.2 2.25 2.3 2.35 2.4 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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
470.000 468.333 466.667 465.000 463.333 440.000 450.000 452.500 455.000 460.000 450.000 455.000 460.000 460.000 460.000 460.000 460.000 460.000 470.000 471.667 473.333 475.000 475.000 480.000 480.000 485.000 485.000 488.750 492.500 496.250 500.000 500.000 501.667 503.333 505.000 506.667 508.333 510.000 511.667 513.333 515.000 505.000 515.000 520.000 525.000 530.000 535.000 540.000 555.000 545.000 535.000 525.000 515.000 505.000 495.000 485.000 475.000 477.500 480.000 475.000 477.500 480.000 480.000 482.381 484.762 487.143 489.524 491.905 494.286 496.667 499.048 501.429 503.810 506.190 508.571 510.952 513.333 515.714 518.095 520.476 522.857 525.238 527.619 530.000 534.000 538.000 542.000 546.000 550.000 550.000 560.000 561.667 563.333 565.000 571.762 579.139 587.219 596.108
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
54 0 0 0 0 51 54 54 57 63 60 0 60 60 0 57 0 60 57 0 57 57 57 57 60 0 60 57 0 0 57 54 0 0 0 51 0 0 0 0 57 0 60 0 0 0 0 51 54 0 48 0 0 0 51 0 51 0 51 54 0 51 51 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 48 0 0 0 0 54 51 0 0 0 54 0 48 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 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 2.734375 0.390625 -0.390625 -0.390625 -2.734375 0.390625 -0.390625 0.390625 -0.390625 0.390625 0.390625 0.390625 0.390625 -2.734375 -0.390625 0.390625 2.734375 0.390625 0.390625 -0.390625 -1.953125 -1.171875 -0.390625 0.390625 0.390625 -0.390625 -0.390625 1.171875 -1.171875 -0.390625 0.390625 -1.953125 -2.734375 0.390625 -1.171875 -0.390625 -1.171875 1.171875 1.171875 -1.171875 -0.390625 -0.390625 -1.171875 0.390625 0.390625 -2.734375 0.390625 -2.734375 1.171875 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -1.171875 -0.390625 0.390625 -0.390625 -0.390625 0.390625 -0.390625 1.171875 -0.390625 2.734375 0.390625
</TraceValueList>
</Trace>
</TraceList>
<ProfileList Num="1">
<Profile  Algorithm="NH" AlgorithmVersion="4.33" Type="vertical" >
<Tabulated Num="177">
<AltitudeList Type="float" Units="km" Description="Altitude above station level" >
93.502 95.0 100.0 105.0 110.0 115.0 120.0 125.0 130.0 135.0 140.0 145.0 145.602 150.0 155.0 160.0 165.0 170.0 175.0 180.0 181.203 185.0 190.0 195.0 200.0 205.0 210.0 215.0 216.805 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 488.973 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.234 0.307 0.343 0.354 0.352 0.344 0.332 0.314 0.289 0.254 0.207 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.216 0.238 0.26 0.281 0.303 0.325 0.346 0.354 0.378 0.422 0.475 0.533 0.593 0.655 0.717 0.778 0.84 0.901 0.962 1.024 1.086 1.149 1.213 1.278 1.344 1.411 1.48 1.551 1.624 1.699 1.776 1.855 1.937 2.022 2.111 2.202 2.297 2.397 2.5 2.609 2.722 2.842 2.967 3.1 3.241 3.39 3.548 3.717 3.898 4.093 4.302 4.527 4.769 5.029 5.307 5.598 5.898 6.192 6.466 6.698 6.872 6.975 7.0 6.999 6.981 6.939 6.875 6.792 6.692 6.578 6.451 6.314 6.168 6.015 5.857 5.694 5.529 5.362 5.195 5.027 4.861 4.696 4.533 4.372 4.215 4.061 3.91 3.763 3.62 3.48 3.345 3.214 3.087 2.965 2.846 2.731 2.621 2.514 2.411 2.312 2.217 2.125 2.037 1.953 1.871 1.793 1.718 1.646 1.577 1.51 1.446 1.385 1.327 1.271 1.217 1.165 1.116 1.068 1.023 0.979 0.938 0.898 0.859 0.823 0.788 0.754 0.722 0.691 0.661 0.633 0.606 0.58 0.555 0.532 0.509 0.487 0.466 0.446 0.427 0.409 0.391 0.375 0.359 0.343 0.328 0.314 0.301 0.288 0.276 0.264 0.253 0.242 0.231 0.221 0.212 0.203

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="0.354" PeakHeight="110.0" Num="3" Error="0.0">
-18.791 2.435 -0.142
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="0.354" EndFrequency="7.0" PeakHeight="488.973" Num="5" zHalfNm="443.511" Error="8.021">
-212.885 -86.359 25.436 7.111 -5.471
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="106.805" Depth="0.154"/>
<TopsideChapman PeakHeight="488.973" PeakDensity="607940.44" PeakScaleHeight="35.653" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
