<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-03-31 -090 01:50:00.000"
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 33 1 0 0 0 0 0 0 0 1 0 "/>
<Comments>AR.5002.44 Confidence: 60% PACIFIC flags: Moderate F-spread, Multiple candidates for F2x cusp, Multiple candidates for F2o cusp, One of F2 cusps was derived from the other, Unidentified traces above foF2</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" >
2026.03.31 (090) 01:50:00</StartTime>
<SolarTerrestrialData>
<GyroFrequency Val="0.63" Model="IGRF 3.0" Altitude="300"/>
<DipAngle Val="-11.18" 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">
FF202609003310150009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="24" >
<URSI ID="00" Val="6.100" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.848" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="17.376" 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="6.650" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="310.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="310.000" 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="5.800" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="420.000" Name="h`(fMUF)" Units="km" QL="/" DL="/" />
<Modeled Name="foEp" Val="0.354" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="2.550" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="2.550" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="378.575" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="335.228" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="6.538" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="64.202" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="6.552" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="32.569" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="69.960" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.460" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="1">
<Trace Type="standard" Layer="F2" Polarization="O" Num="73">
<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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
315.000 310.000 335.000 360.000 359.000 358.000 357.000 356.000 355.000 355.000 360.000 365.000 371.667 378.333 385.000 382.000 379.000 376.000 373.000 370.000 366.250 362.500 358.750 355.000 355.000 355.000 355.000 356.667 358.333 360.000 361.667 363.333 365.000 365.000 365.000 370.000 372.500 375.000 380.000 382.500 385.000 387.500 390.000 392.500 395.000 397.500 400.000 410.000 409.583 409.167 408.750 408.333 407.917 407.500 407.083 406.667 406.250 405.833 405.417 405.000 410.000 410.000 410.000 410.000 413.333 416.667 420.000 430.000 440.000 448.734 458.705 470.195 483.580
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
57 60 0 51 57 0 0 0 60 57 54 63 0 0 54 0 0 0 0 63 0 60 0 60 63 0 0 0 0 51 0 0 54 0 60 63 57 60 57 0 0 0 0 0 57 0 60 51 0 0 0 0 0 0 51 0 54 0 0 0 54 0 0 57 0 0 54 57 0 54 0 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 0.390625 0.390625 -0.390625 -0.390625 1.171875 -1.171875 0.390625 -0.390625 -1.953125 0.390625 0.390625 0.390625 0.390625 1.171875 0.390625 0.390625 0.390625 1.171875 1.171875 0.390625 0.390625 0.390625 1.171875 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 1.171875 1.171875 -0.390625 -0.390625 0.390625 1.171875 1.953125 -0.390625 -0.390625 1.953125 -0.390625 -0.390625 1.953125 -0.390625 1.953125 0.390625 -0.390625 -0.390625 1.953125 2.734375 0.390625 0.390625 2.734375 2.734375 0.390625 0.390625 0.390625 1.171875 1.953125 0.390625
</TraceValueList>
</Trace>
</TraceList>
<ProfileList Num="1">
<Profile  Algorithm="NH" AlgorithmVersion="4.33" Type="vertical" >
<Tabulated Num="144">
<AltitudeList Type="float" Units="km" Description="Altitude above station level" >
93.502 95.0 100.0 105.0 110.0 115.0 120.0 125.0 130.0 135.0 140.0 145.0 147.437 150.0 155.0 160.0 165.0 170.0 175.0 180.0 184.874 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 222.311 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 378.575 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.234 0.307 0.343 0.354 0.352 0.345 0.334 0.318 0.295 0.266 0.225 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.201 0.221 0.242 0.262 0.283 0.303 0.324 0.344 0.354 0.391 0.472 0.566 0.671 0.786 0.909 1.04 1.178 1.323 1.477 1.638 1.807 1.985 2.172 2.369 2.575 2.792 3.019 3.256 3.504 3.761 4.027 4.301 4.579 4.859 5.133 5.396 5.635 5.838 5.992 6.081 6.1 6.099 6.078 6.032 5.965 5.878 5.775 5.659 5.53 5.393 5.247 5.096 4.941 4.783 4.624 4.464 4.304 4.146 3.99 3.837 3.686 3.539 3.395 3.255 3.119 2.988 2.861 2.738 2.619 2.505 2.395 2.289 2.187 2.089 1.996 1.906 1.819 1.737 1.658 1.582 1.51 1.441 1.375 1.311 1.251 1.193 1.138 1.085 1.035 0.987 0.941 0.897 0.856 0.816 0.778 0.742 0.707 0.674 0.643 0.613 0.584 0.557 0.531 0.506 0.482 0.46 0.438 0.418 0.398 0.38 0.362 0.345 0.329 0.313 0.299 0.285 0.271 0.259 0.247 0.235 0.224 0.214 0.204

</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="6.1" PeakHeight="378.575" Num="5" zHalfNm="335.228" Error="3.287">
-142.439 -22.813 11.108 -1.799 -0.321
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="112.311" Depth="0.154"/>
<TopsideChapman PeakHeight="378.575" PeakDensity="461662.53" PeakScaleHeight="32.569" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
