<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-02-26 -057 09:30:00.000"
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 22 0 0 0 0 0 0 0 0 1 0 "/>
<Comments>AR.5002.44 Confidence: 70% PACIFIC flags: Multiple candidates for F2x cusp, Multiple candidates for F2o cusp, 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" >
2026.02.26 (057) 09:30:00</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">
FF202605702260930009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="24" >
<URSI ID="00" Val="7.850" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="3.276" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="25.719" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="2.500" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="2.500" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="8.300" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="245.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="245.000" 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="0.250" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="7.250" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="316.574" Name="h`(fMUF)" Units="km" QL="/" DL="/" />
<Modeled Name="foEp" Val="1.613" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="2.900" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="2.900" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="295.414" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="227.301" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="5.253" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="98.856" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="17.788" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="55.618" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="74.060" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="5.120" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="1">
<Trace Type="standard" Layer="F2" Polarization="O" Num="108">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
2.5 2.55 2.6 2.65 2.7 2.75 2.8 2.85 2.9 2.95 3.0 3.05 3.1 3.15 3.2 3.25 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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
255.000 250.000 250.000 250.000 250.000 250.000 250.000 250.000 245.000 247.500 250.000 250.000 250.000 250.000 250.000 250.000 250.000 250.000 250.000 250.000 250.000 250.000 255.000 255.000 250.000 250.000 250.000 255.000 255.000 255.000 255.000 255.000 255.000 255.000 255.000 255.000 255.000 255.000 255.000 256.000 257.000 258.000 259.000 260.000 260.000 260.000 260.000 260.000 260.000 265.000 270.000 268.750 267.500 266.250 265.000 265.000 265.000 265.000 275.000 275.000 275.000 275.000 275.000 275.000 270.000 275.000 280.000 280.000 280.000 280.000 280.000 280.000 280.000 280.000 285.000 285.000 285.000 280.000 280.000 290.000 290.000 290.000 295.000 300.000 305.000 310.000 310.000 310.000 305.000 300.000 302.025 304.279 306.801 309.645 312.874 316.574 320.854 325.864 331.807 338.971 347.776 358.856 373.227 392.609 420.176 462.501 535.769 693.459
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
51 51 54 51 0 0 0 60 51 0 63 66 66 66 69 69 69 66 66 66 66 66 66 69 69 60 57 66 0 66 0 63 0 0 0 0 0 66 63 0 0 0 0 69 72 0 0 69 63 57 0 0 0 0 0 63 0 0 54 60 66 69 75 75 0 0 63 66 69 72 0 69 66 72 66 69 75 78 54 72 72 72 75 69 66 66 69 60 78 66 0 0 57 0 60 0 57 54 66 0 54 0 63 63 48 45 57 0
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
0.390625 0.390625 0.390625 -0.390625 0.390625 -1.953125 0.390625 0.390625 -1.953125 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 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 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 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 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 1.171875 1.171875 1.171875 1.171875 1.171875 -2.734375
</TraceValueList>
</Trace>
</TraceList>
<ProfileList Num="1">
<Profile  Algorithm="NH" AlgorithmVersion="4.33" Type="vertical" >
<Tabulated Num="188">
<AltitudeList Type="float" Units="km" Description="Altitude above station level" >
89.888 90.0 95.0 100.0 105.0 110.0 115.0 120.0 120.505 125.0 130.0 131.011 135.0 140.0 141.516 145.0 150.0 155.0 160.0 165.0 170.0 175.0 180.0 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 295.414 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 1000.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.21 1.079 1.397 1.561 1.613 1.582 1.485 1.471 1.471 1.471 1.471 1.525 1.593 1.613 1.731 1.879 2.017 2.152 2.287 2.426 2.569 2.72 2.88 3.054 3.244 3.457 3.699 3.983 4.327 4.756 5.287 5.851 6.327 6.686 6.959 7.171 7.339 7.473 7.581 7.667 7.734 7.785 7.821 7.842 7.85 7.85 7.845 7.828 7.8 7.762 7.714 7.658 7.593 7.52 7.441 7.356 7.265 7.169 7.069 6.964 6.856 6.746 6.633 6.517 6.4 6.282 6.163 6.043 5.922 5.802 5.681 5.561 5.442 5.323 5.205 5.088 4.973 4.858 4.745 4.633 4.523 4.415 4.308 4.203 4.1 3.999 3.899 3.802 3.706 3.612 3.52 3.43 3.342 3.256 3.172 3.089 3.009 2.93 2.853 2.778 2.704 2.633 2.563 2.495 2.428 2.363 2.3 2.238 2.178 2.119 2.062 2.006 1.952 1.899 1.848 1.798 1.749 1.701 1.655 1.61 1.566 1.523 1.481 1.441 1.401 1.363 1.326 1.289 1.254 1.22 1.186 1.154 1.122 1.091 1.061 1.032 1.003 0.976 0.949 0.923 0.897 0.872 0.848 0.825 0.802 0.78 0.759 0.738 0.717 0.697 0.678 0.659 0.641 0.623 0.606 0.59 0.573 0.557 0.542 0.527 0.512 0.498 0.484 0.471 0.458 0.445 0.433 0.421 0.409 0.398 0.387 0.376 0.366 0.356 0.346 0.336 0.327 0.318 0.309 0.301 0.292 0.284 0.276 0.269 0.261 0.254 0.247

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="1.613" PeakHeight="110.0" Num="3" Error="0.0">
-28.375 10.205 -1.942
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="1.613" EndFrequency="7.85" PeakHeight="295.414" Num="5" zHalfNm="227.301" Error="7.072">
-157.183 18.77 -26.402 11.977 -1.06
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="31.516" Depth="0.142"/>
<TopsideChapman PeakHeight="295.414" PeakDensity="764547.1" PeakScaleHeight="55.618" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
