<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-02-28 -059 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 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) 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">
FF202605902282330009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="25" >
<URSI ID="00" Val="8.800" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.608" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="22.951" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="5.200" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="5.200" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="9.350" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="460.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="460.000" 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="0.350" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="8.150" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="465.000" 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="7.950" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="7.950" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="442.084" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="392.385" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="7.164" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="77.195" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="15.744" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="35.974" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="92.270" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.250" 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" >
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 8.35 8.4 8.45 8.5 8.55 8.6 8.65 8.7 8.75 8.8
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
505.000 500.000 495.000 495.000 495.000 480.000 490.000 495.000 500.000 480.000 490.000 490.000 490.000 490.000 490.000 490.000 490.000 490.000 490.000 490.000 490.000 490.000 490.000 490.000 490.000 491.667 493.333 495.000 495.000 495.000 495.000 495.000 495.000 495.000 495.000 490.000 490.000 490.000 485.000 485.000 486.071 487.143 488.214 489.286 490.357 491.429 492.500 493.571 494.643 495.714 496.786 497.857 498.929 500.000 500.000 460.000 461.250 462.500 463.750 465.000 470.000 480.000 490.000 500.000 500.000 515.000 525.000 525.649 526.546 527.866 530.000 534.040 544.593
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
54 0 48 0 54 60 54 48 0 0 0 0 0 0 0 0 0 51 0 0 0 0 57 0 51 0 0 63 60 57 0 51 0 60 66 63 0 57 57 57 0 0 0 0 0 0 0 54 63 63 66 57 0 63 57 54 54 0 0 51 54 57 51 48 54 66 60 60 57 63 54 54 48
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
-0.390625 2.734375 -1.171875 -0.390625 -1.171875 -0.390625 -1.171875 -1.171875 -1.171875 -0.390625 -1.171875 -1.171875 -0.390625 -1.171875 -1.171875 1.171875 -2.734375 -1.171875 0.390625 0.390625 1.953125 -1.953125 -1.171875 -1.171875 -0.390625 -1.953125 -1.953125 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -0.390625 -0.390625 -1.171875 -1.171875 -1.171875 -0.390625 -1.171875 -1.171875 1.171875 -0.390625 -1.953125 0.390625 -0.390625 -1.171875 -1.171875 -1.953125 -1.171875 -1.171875 -1.953125 -2.734375 -1.953125 -0.390625 -1.171875 -2.734375 -2.734375 1.171875 1.171875 0.390625 0.390625 0.390625 -1.953125 -1.171875 -1.171875 -1.171875 -2.734375 -2.734375 -2.734375 -2.734375 -2.734375 -2.734375 -1.171875
</TraceValueList>
</Trace>
</TraceList>
<ProfileList Num="1">
<Profile  Algorithm="NH" AlgorithmVersion="4.33" Type="vertical" >
<Tabulated Num="174">
<AltitudeList Type="float" Units="km" Description="Altitude above station level" >
93.502 95.0 100.0 105.0 110.0 115.0 120.0 125.0 130.0 135.0 140.0 144.794 145.0 150.0 155.0 160.0 165.0 170.0 175.0 179.587 180.0 185.0 190.0 195.0 200.0 205.0 210.0 214.381 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 442.084 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0
</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 0.331 0.312 0.285 0.249 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.202 0.224 0.246 0.268 0.29 0.312 0.335 0.354 0.363 0.43 0.499 0.575 0.658 0.752 0.856 0.973 1.102 1.241 1.389 1.545 1.705 1.87 2.038 2.209 2.381 2.555 2.73 2.908 3.086 3.267 3.449 3.634 3.821 4.01 4.202 4.398 4.596 4.798 5.004 5.215 5.43 5.65 5.877 6.109 6.349 6.596 6.853 7.118 7.395 7.683 7.981 8.285 8.575 8.777 8.8 8.794 8.76 8.698 8.609 8.499 8.368 8.22 8.058 7.883 7.699 7.506 7.307 7.104 6.897 6.689 6.48 6.272 6.065 5.86 5.657 5.458 5.263 5.071 4.884 4.702 4.524 4.351 4.184 4.021 3.863 3.711 3.564 3.421 3.284 3.151 3.024 2.901 2.782 2.668 2.559 2.453 2.352 2.254 2.161 2.071 1.984 1.902 1.822 1.746 1.673 1.602 1.535 1.471 1.409 1.349 1.292 1.238 1.186 1.136 1.088 1.042 0.998 0.955 0.915 0.876 0.839 0.804 0.769 0.737 0.706 0.676 0.647 0.62 0.593 0.568 0.544 0.521 0.499 0.478 0.457 0.438 0.419 0.401 0.384 0.368 0.352 0.338 0.323 0.309 0.296 0.284 0.272 0.26 0.249 0.238 0.228 0.219 0.209 0.2

</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="8.8" PeakHeight="442.084" Num="5" zHalfNm="392.385" Error="6.033">
-196.176 -59.848 42.064 -18.265 4.522
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="104.381" Depth="0.154"/>
<TopsideChapman PeakHeight="442.084" PeakDensity="960794.06" PeakScaleHeight="35.974" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
