<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-02-24 -055 23:30:00.000"
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 55 1 0 0 0 0 0 0 0 1 0 "/>
<Comments>AR.5002.44 Confidence: 20% PACIFIC flags: Moderate F-spread, 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" >
2026.02.24 (055) 23:30:00</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">
FF202605502242330009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="25" >
<URSI ID="00" Val="8.300" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.682" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="22.260" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="5.000" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="5.000" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="8.650" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="380.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="380.000" 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="7.800" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="455.000" 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="5.400" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="5.400" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="419.933" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="368.069" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="7.163" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="78.677" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="14.372" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="37.882" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="87.950" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.410" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="1">
<Trace Type="standard" Layer="F2" Polarization="O" Num="67">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
435.000 435.000 435.000 412.500 390.000 387.500 385.000 382.500 380.000 390.000 380.000 425.000 432.500 440.000 445.000 450.000 445.000 445.000 460.000 461.667 463.333 465.000 465.000 465.000 465.000 465.000 465.000 467.500 470.000 471.250 472.500 473.750 475.000 476.250 477.500 478.750 480.000 475.000 472.500 470.000 470.000 470.000 470.000 475.000 475.000 475.000 475.000 475.000 475.000 475.000 475.000 480.000 480.000 485.000 482.500 480.000 455.000 480.000 485.000 490.000 495.000 505.000 505.000 506.760 509.607 515.000 529.120
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
63 63 60 0 60 0 0 0 57 57 57 63 0 66 66 60 60 0 57 0 0 60 0 0 60 60 63 0 63 0 60 0 0 0 57 60 57 57 0 60 60 0 60 60 63 0 0 0 57 0 63 54 60 63 57 60 48 66 63 60 63 51 63 66 69 57 0
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
-1.171875 -0.390625 -1.171875 1.953125 0.390625 0.390625 2.734375 2.734375 0.390625 0.390625 0.390625 -0.390625 2.734375 -1.171875 -1.171875 -0.390625 -1.171875 -1.171875 -0.390625 -0.390625 -2.734375 -0.390625 -2.734375 2.734375 -0.390625 -1.171875 -1.171875 1.953125 -0.390625 1.953125 -1.171875 1.953125 -1.171875 -1.171875 -1.171875 -1.171875 -0.390625 -1.171875 -1.171875 -1.171875 1.953125 1.953125 1.953125 -1.171875 -1.171875 -1.953125 -2.734375 -0.390625 0.390625 2.734375 -1.171875 1.171875 0.390625 0.390625 0.390625 0.390625 2.734375 0.390625 0.390625 0.390625 0.390625 1.953125 0.390625 0.390625 0.390625 0.390625 0.390625
</TraceValueList>
</Trace>
</TraceList>
<ProfileList Num="1">
<Profile  Algorithm="NH" AlgorithmVersion="4.33" Type="vertical" >
<Tabulated Num="173">
<AltitudeList Type="float" Units="km" Description="Altitude above station level" >
93.502 95.0 100.0 105.0 110.0 115.0 120.0 125.0 130.0 135.0 140.0 144.741 145.0 150.0 155.0 160.0 165.0 170.0 175.0 179.481 180.0 185.0 190.0 195.0 200.0 205.0 210.0 214.222 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 419.933 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.234 0.307 0.343 0.354 0.351 0.344 0.331 0.312 0.285 0.248 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.202 0.224 0.247 0.269 0.291 0.313 0.335 0.354 0.368 0.447 0.522 0.603 0.691 0.788 0.898 1.02 1.156 1.305 1.466 1.638 1.818 2.004 2.196 2.393 2.592 2.795 3.001 3.209 3.42 3.634 3.851 4.07 4.293 4.52 4.75 4.984 5.223 5.466 5.714 5.967 6.226 6.49 6.759 7.032 7.308 7.58 7.841 8.071 8.238 8.3 8.3 8.286 8.246 8.183 8.098 7.995 7.876 7.742 7.596 7.439 7.274 7.102 6.925 6.744 6.559 6.373 6.186 5.999 5.813 5.628 5.446 5.266 5.088 4.914 4.744 4.577 4.414 4.255 4.101 3.951 3.805 3.663 3.526 3.393 3.264 3.14 3.02 2.904 2.792 2.683 2.579 2.478 2.381 2.288 2.198 2.112 2.028 1.948 1.871 1.797 1.725 1.656 1.59 1.527 1.466 1.407 1.351 1.297 1.245 1.195 1.147 1.101 1.057 1.015 0.974 0.935 0.897 0.861 0.826 0.793 0.761 0.73 0.701 0.673 0.646 0.62 0.595 0.571 0.548 0.525 0.504 0.484 0.464 0.446 0.428 0.41 0.394 0.378 0.363 0.348 0.334 0.32 0.308 0.295 0.283 0.272 0.261 0.25 0.24 0.23 0.221 0.212 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="8.3" PeakHeight="419.933" Num="5" zHalfNm="368.069" Error="4.541">
-184.824 -40.284 28.154 -12.736 3.979
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="104.222" Depth="0.154"/>
<TopsideChapman PeakHeight="419.933" PeakDensity="854714.6" PeakScaleHeight="37.882" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
