<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-02-27 -058 23:50:00.000"
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 44 0 0 0 0 0 0 0 0 1 0 "/>
<Comments>AR.5002.44 Confidence: 40% PACIFIC flags: Multiple candidates for F2x cusp, Multiple candidates for F2o cusp, F2 cusps do not match, 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" >
2026.02.27 (058) 23:50:00</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">
FF202605802272350009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="25" >
<URSI ID="00" Val="7.950" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.531" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="20.120" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="3.300" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="3.300" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="8.000" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="360.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="360.000" 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="0.700" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="7.050" 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="3.300" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="3.300" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="424.220" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="351.565" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="6.964" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="105.258" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="18.105" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="54.904" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="101.900" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="2.250" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="1">
<Trace Type="standard" Layer="F2" Polarization="O" Num="94">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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 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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
360.000 360.000 360.000 360.000 360.000 360.000 360.000 360.000 362.500 365.000 365.000 380.000 380.000 380.000 380.000 380.000 380.000 377.500 375.000 375.000 372.500 370.000 370.000 375.000 375.000 380.000 381.250 382.500 383.750 385.000 385.000 387.500 390.000 385.000 385.000 385.000 385.000 386.667 388.333 390.000 390.000 391.667 393.333 395.000 400.000 390.000 400.000 405.000 400.000 405.000 410.000 410.000 410.000 410.000 410.000 410.000 410.000 410.000 410.000 415.000 415.000 413.333 411.667 410.000 410.000 410.000 417.500 425.000 425.000 430.000 435.000 437.500 440.000 445.000 450.000 455.000 470.000 475.000 479.667 484.333 489.000 493.667 498.333 503.000 507.667 512.333 517.000 521.667 532.062 543.663 556.692 571.429 588.236 607.579
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
63 0 0 0 63 57 57 54 0 57 60 57 54 0 48 51 54 57 63 63 0 0 51 66 60 57 0 0 0 60 60 63 63 63 0 57 66 0 0 60 60 60 0 57 63 60 60 63 57 0 60 0 63 0 60 0 0 57 57 66 69 0 0 63 60 60 0 60 66 60 63 54 57 54 60 57 51 48 0 0 0 0 0 0 0 0 0 54 51 57 51 0 0 0
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
-1.171875 -0.390625 0.390625 -0.390625 -0.390625 -0.390625 0.390625 0.390625 0.390625 -1.171875 -0.390625 -1.171875 -1.171875 -0.390625 -1.171875 -1.171875 -1.171875 -1.171875 -0.390625 0.390625 -0.390625 -0.390625 0.390625 -0.390625 -1.171875 -0.390625 0.390625 -0.390625 -1.171875 -1.171875 -0.390625 -1.953125 -0.390625 -0.390625 -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 -0.390625 -0.390625 -0.390625 -0.390625 1.171875 0.390625 -0.390625 -2.734375 -0.390625 -0.390625 -0.390625 -0.390625 -1.171875 -0.390625 -0.390625 0.390625 -0.390625 -0.390625 0.390625 -0.390625 0.390625 -0.390625 -1.171875 0.390625 0.390625 0.390625 -0.390625 1.171875 0.390625 -0.390625 -1.953125 -2.734375 -1.171875 -0.390625 -0.390625 1.171875 2.734375 -2.734375 -0.390625 -1.953125 -1.953125 0.390625 1.953125 -1.171875 2.734375
</TraceValueList>
</Trace>
</TraceList>
<ProfileList Num="1">
<Profile  Algorithm="NH" AlgorithmVersion="4.33" Type="vertical" >
<Tabulated Num="187">
<AltitudeList Type="float" Units="km" Description="Altitude above station level" >
93.502 95.0 100.0 105.0 110.0 115.0 120.0 125.0 130.0 135.0 140.0 145.0 145.364 150.0 155.0 160.0 165.0 170.0 175.0 180.0 180.728 185.0 190.0 195.0 200.0 205.0 210.0 215.0 216.092 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 424.22 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 1000.0
</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 0.332 0.313 0.288 0.253 0.204 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.219 0.24 0.262 0.284 0.306 0.327 0.349 0.354 0.401 0.467 0.541 0.624 0.714 0.813 0.922 1.04 1.169 1.309 1.462 1.626 1.805 1.997 2.203 2.425 2.66 2.91 3.173 3.449 3.734 4.028 4.329 4.632 4.935 5.236 5.531 5.817 6.092 6.354 6.6 6.829 7.04 7.23 7.399 7.547 7.672 7.775 7.854 7.91 7.942 7.95 7.95 7.942 7.921 7.89 7.848 7.796 7.735 7.666 7.589 7.506 7.416 7.321 7.22 7.116 7.007 6.895 6.78 6.663 6.544 6.423 6.302 6.179 6.055 5.932 5.808 5.685 5.562 5.44 5.319 5.198 5.079 4.961 4.845 4.73 4.616 4.504 4.395 4.286 4.18 4.076 3.973 3.872 3.774 3.677 3.582 3.49 3.399 3.31 3.223 3.139 3.056 2.975 2.896 2.818 2.743 2.669 2.598 2.528 2.459 2.393 2.328 2.265 2.203 2.143 2.084 2.027 1.972 1.918 1.865 1.814 1.764 1.715 1.668 1.622 1.577 1.533 1.491 1.449 1.409 1.37 1.332 1.295 1.259 1.224 1.19 1.157 1.125 1.093 1.063 1.033 1.004 0.976 0.949 0.923 0.897 0.872 0.848 0.824 0.801 0.778 0.757 0.736 0.715 0.695 0.675 0.657 0.638 0.62 0.603 0.586 0.57 0.554 0.538 0.523 0.508 0.494

</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="7.95" PeakHeight="424.22" Num="5" zHalfNm="351.565" Error="2.84">
-212.883 7.224 -4.528 2.648 -0.589
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="106.092" Depth="0.154"/>
<TopsideChapman PeakHeight="424.22" PeakDensity="784150.1" PeakScaleHeight="54.904" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
