<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-02-23 -054 00:30:00.000"
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: 50% PACIFIC flags: Moderate F-spread, Multiple candidates for F2x cusp, Multiple candidates for F2o cusp, 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" >
2026.02.23 (054) 00:30:00</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">
FF202605402230030009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="24" >
<URSI ID="00" Val="6.900" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.641" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="18.226" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="3.350" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="3.350" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="7.250" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="345.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="345.000" 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="0.200" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="6.600" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="480.000" Name="h`(fMUF)" Units="km" QL="/" DL="/" />
<Modeled Name="foEp" Val="0.354" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="3.350" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="3.350" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="429.334" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="375.236" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="6.548" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="81.617" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="10.383" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="39.572" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="91.880" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.360" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="1">
<Trace Type="standard" Layer="F2" Polarization="O" Num="72">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
345.000 350.000 355.000 365.000 375.000 380.000 385.000 390.000 395.000 400.000 405.000 410.000 415.000 420.000 425.000 430.000 435.000 440.000 445.000 440.000 435.000 430.000 445.000 450.000 460.000 460.000 460.000 460.000 460.000 465.000 470.000 475.000 475.000 475.000 475.000 475.000 475.000 475.000 475.000 475.000 475.000 475.000 475.000 472.500 470.000 466.667 463.333 460.000 457.500 455.000 458.750 462.500 466.250 470.000 473.750 477.500 481.250 485.000 488.750 492.500 496.250 500.000 500.000 495.000 515.000 480.000 490.000 495.000 510.000 526.533 549.519 583.656
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
72 66 60 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 51 0 0 48 54 54 54 51 63 60 57 0 57 63 57 0 0 48 0 63 63 57 63 54 57 0 0 54 0 51 0 54 0 0 0 0 0 0 0 0 0 0 0 57 60 57 0 63 63 54 51 0 0 0
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
-0.390625 -0.390625 -0.390625 1.171875 1.171875 -1.171875 -1.171875 1.953125 1.953125 2.734375 2.734375 1.953125 1.171875 1.953125 -2.734375 1.953125 1.953125 2.734375 -1.171875 -1.953125 1.953125 -1.171875 -0.390625 -1.171875 -0.390625 -1.171875 -1.171875 -1.171875 -1.171875 2.734375 -1.171875 -1.171875 -1.171875 -0.390625 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 2.734375 -1.171875 -1.171875 2.734375 -1.171875 -1.171875 -1.953125 -1.171875 2.734375 0.390625 1.953125 -2.734375 1.171875 -1.171875 -1.171875 -1.171875 2.734375 0.390625 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 0.390625 0.390625 0.390625 0.390625 2.734375 -1.171875
</TraceValueList>
</Trace>
</TraceList>
<ProfileList Num="1">
<Profile  Algorithm="NH" AlgorithmVersion="4.33" Type="vertical" >
<Tabulated Num="175">
<AltitudeList Type="float" Units="km" Description="Altitude above station level" >
93.502 95.0 100.0 105.0 110.0 115.0 120.0 125.0 130.0 135.0 140.0 145.0 146.216 150.0 155.0 160.0 165.0 170.0 175.0 180.0 182.432 185.0 190.0 195.0 200.0 205.0 210.0 215.0 218.648 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 429.334 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0
</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 0.333 0.315 0.291 0.258 0.213 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.211 0.232 0.253 0.275 0.296 0.317 0.338 0.354 0.373 0.439 0.506 0.578 0.657 0.743 0.838 0.942 1.056 1.177 1.307 1.443 1.584 1.731 1.882 2.036 2.193 2.352 2.514 2.679 2.846 3.015 3.187 3.361 3.539 3.719 3.902 4.088 4.278 4.471 4.668 4.869 5.075 5.284 5.498 5.715 5.934 6.153 6.369 6.571 6.745 6.864 6.9 6.9 6.887 6.854 6.803 6.737 6.656 6.562 6.457 6.343 6.22 6.091 5.956 5.816 5.673 5.527 5.38 5.231 5.082 4.934 4.786 4.639 4.494 4.351 4.211 4.073 3.937 3.804 3.675 3.548 3.425 3.305 3.188 3.075 2.965 2.858 2.754 2.654 2.557 2.463 2.372 2.284 2.199 2.117 2.038 1.961 1.888 1.816 1.748 1.682 1.618 1.557 1.497 1.44 1.385 1.333 1.282 1.233 1.185 1.14 1.096 1.054 1.014 0.975 0.937 0.901 0.867 0.833 0.801 0.77 0.741 0.712 0.685 0.658 0.633 0.608 0.585 0.562 0.541 0.52 0.5 0.48 0.462 0.444 0.427 0.41 0.394 0.379 0.364 0.35 0.337 0.324 0.311 0.299 0.288 0.276 0.266 0.255 0.246 0.236 0.227 0.218 0.21 0.202

</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="6.9" PeakHeight="429.334" Num="5" zHalfNm="375.236" Error="4.87">
-187.412 -42.815 27.964 -11.549 3.126
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="108.648" Depth="0.154"/>
<TopsideChapman PeakHeight="429.334" PeakDensity="590694.8" PeakScaleHeight="39.572" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
