<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-02-28 -059 00:10:00.000"
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 44 1 0 0 0 0 0 0 0 1 0 "/>
<Comments>AR.5002.44 Confidence: 40% 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, 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" >
2026.02.28 (059) 00:10:00</StartTime>
<SolarTerrestrialData>
<GyroFrequency Val="0.63" Model="IGRF 3.0" Altitude="300"/>
<DipAngle Val="-11.15" 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">
FF202605902280010009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="25" >
<URSI ID="00" Val="7.800" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.986" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="23.289" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="4.050" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="4.050" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="8.100" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="390.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="390.000" 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="7.550" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="400.000" Name="h`(fMUF)" Units="km" QL="/" DL="/" />
<Custom Name="dlt foF2" Val="0.000" Description="Adjustment to the scaled foF2 during profile inversion" Units="MHz" />
<Modeled Name="foEp" Val="0.354" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="6.150" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="6.150" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="387.184" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="346.893" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="6.758" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="60.988" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="10.098" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="30.165" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="69.790" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.320" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="1">
<Trace Type="standard" Layer="F2" Polarization="O" Num="76">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
410.000 410.000 411.667 413.333 415.000 425.000 420.000 422.500 425.000 420.000 417.500 415.000 415.000 415.000 415.000 415.000 415.000 415.000 415.000 413.958 412.917 411.875 410.833 409.792 408.750 407.708 406.667 405.625 404.583 403.542 402.500 401.458 400.417 399.375 398.333 397.292 396.250 395.208 394.167 393.125 392.083 391.042 390.000 390.000 390.000 390.000 390.000 390.000 390.000 390.000 395.000 395.000 395.263 395.526 395.789 396.053 396.316 396.579 396.842 397.105 397.368 397.632 397.895 398.158 398.421 398.684 398.947 399.211 399.474 399.737 400.000 465.000 469.399 476.516 490.000 525.301
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
48 48 0 0 57 51 51 57 57 54 0 51 0 51 54 0 0 0 51 0 48 0 54 0 0 0 0 0 48 0 0 0 0 0 0 0 0 0 0 0 0 0 51 54 51 0 0 0 0 48 48 51 0 45 0 0 48 0 45 51 0 0 0 0 0 0 0 0 0 0 51 51 0 51 45 45
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
-0.390625 -1.171875 -1.953125 -1.953125 -1.953125 -2.734375 -1.953125 -2.734375 -1.953125 1.171875 1.171875 -1.953125 -1.953125 -1.953125 -1.171875 1.953125 -1.953125 1.953125 -0.390625 -1.953125 -1.171875 0.390625 -1.953125 0.390625 0.390625 0.390625 0.390625 2.734375 0.390625 0.390625 0.390625 -0.390625 -0.390625 2.734375 -1.171875 0.390625 0.390625 -1.953125 -1.171875 0.390625 -1.953125 -1.953125 0.390625 0.390625 -0.390625 0.390625 -1.953125 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 2.734375 -0.390625 1.953125 -2.734375 -2.734375 0.390625 -2.734375 -2.734375 0.390625 -2.734375 0.390625 -1.953125 1.171875 -1.953125 1.953125 -1.953125
</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 95.0 100.0 105.0 110.0 115.0 120.0 125.0 130.0 135.0 140.0 145.0 145.861 150.0 155.0 160.0 165.0 170.0 175.0 180.0 181.723 185.0 190.0 195.0 200.0 205.0 210.0 215.0 217.584 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 387.184 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0
</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 0.332 0.314 0.29 0.256 0.21 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.214 0.236 0.257 0.278 0.3 0.321 0.343 0.354 0.378 0.44 0.526 0.638 0.773 0.923 1.081 1.245 1.413 1.586 1.764 1.946 2.135 2.329 2.531 2.74 2.958 3.184 3.42 3.666 3.923 4.191 4.472 4.765 5.071 5.391 5.723 6.067 6.418 6.77 7.11 7.416 7.656 7.786 7.8 7.793 7.752 7.675 7.568 7.434 7.279 7.105 6.917 6.717 6.509 6.294 6.075 5.855 5.634 5.415 5.198 4.984 4.775 4.57 4.371 4.177 3.989 3.808 3.633 3.464 3.302 3.146 2.997 2.854 2.717 2.585 2.46 2.34 2.226 2.117 2.013 1.913 1.819 1.729 1.643 1.561 1.484 1.41 1.339 1.272 1.209 1.148 1.091 1.036 0.984 0.935 0.888 0.843 0.801 0.76 0.722 0.686 0.651 0.618 0.587 0.558 0.53 0.503 0.478 0.453 0.431 0.409 0.388 0.369 0.35 0.332 0.316 0.3 0.285 0.27 0.257 0.244 0.231 0.22 0.209

</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="7.8" PeakHeight="387.184" Num="5" zHalfNm="346.893" Error="6.936">
-149.095 -34.055 19.827 -5.438 -0.839
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="107.584" Depth="0.154"/>
<TopsideChapman PeakHeight="387.184" PeakDensity="754838.7" PeakScaleHeight="30.165" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
