<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-02-27 -058 21:50:00.000"
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 22 0 0 0 0 0 0 0 0 1 0 "/>
<Comments>AR.5002.44 Confidence: 80% PACIFIC flags: Multiple candidates for F2x cusp, Multiple candidates for F2o cusp, One of F2 cusps was derived from the other</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) 21:50:00</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">
FF202605802272150009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="24" >
<URSI ID="00" Val="9.500" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.350" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="22.323" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="3.600" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="3.600" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="9.800" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="350.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="350.000" 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="0.300" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="8.600" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="530.000" Name="h`(fMUF)" Units="km" QL="/" DL="/" />
<Modeled Name="foEp" Val="0.473" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="3.600" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="3.600" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="448.485" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="363.197" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="7.974" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="124.647" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="30.263" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="63.508" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="124.700" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.950" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="1">
<Trace Type="standard" Layer="F2" Polarization="O" Num="119">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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 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 8.85 8.9 8.95 9.0 9.05 9.1 9.15 9.2 9.25 9.3 9.35 9.4 9.45 9.5
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
350.000 350.000 350.000 350.000 350.000 350.000 350.000 351.875 353.750 355.625 357.500 359.375 359.531 359.688 359.844 360.000 362.500 365.000 365.000 367.500 370.000 370.000 370.000 370.000 370.000 370.000 370.000 370.000 375.000 375.000 375.000 385.000 382.500 380.000 385.000 386.000 387.000 388.000 389.000 390.000 390.000 391.667 393.333 395.000 397.500 400.000 405.000 405.000 405.000 405.000 410.000 410.000 412.500 415.000 416.667 418.333 420.000 420.000 420.000 420.000 425.000 425.000 430.000 430.000 432.500 435.000 435.000 440.000 442.500 445.000 447.500 450.000 450.000 450.000 450.000 453.750 457.500 461.250 465.000 470.000 470.000 475.000 475.000 480.000 480.000 485.000 485.000 490.000 490.000 495.000 500.000 500.000 505.000 505.000 515.000 515.000 520.000 525.000 525.000 530.000 530.000 540.000 545.000 550.000 550.000 560.000 565.000 565.000 570.000 575.000 580.000 585.000 595.000 600.000 605.000 614.306 625.274 638.393 654.365
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
48 51 51 0 0 60 54 0 0 0 0 0 0 0 0 57 51 48 63 0 57 51 57 54 0 66 0 48 63 0 0 48 0 69 66 0 60 0 0 66 54 0 0 72 63 66 45 54 0 63 57 60 48 60 0 0 60 66 66 69 66 69 60 63 0 60 66 60 0 57 0 54 57 57 54 0 0 0 54 57 60 54 63 60 69 66 69 63 66 63 60 66 60 57 45 60 57 57 54 60 63 66 66 60 57 54 51 54 57 51 51 54 54 54 57 54 51 0 0
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
1.171875 -1.171875 -1.171875 -0.390625 -0.390625 -0.390625 -0.390625 0.390625 -1.171875 -1.171875 -1.171875 -1.171875 -0.390625 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -0.390625 -0.390625 -1.171875 -1.171875 -0.390625 -0.390625 -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 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -0.390625 -2.734375 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.953125 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -0.390625 -1.171875 1.953125 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.953125 -1.171875 -1.171875 -1.953125 -1.953125 -1.953125 -1.953125 -1.171875 -1.171875 -1.953125 -1.953125 -1.953125 -1.953125 -1.171875 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.171875 -1.171875 -1.953125 -1.953125 -1.953125 -1.171875 -1.171875 -1.953125 -1.953125
</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" >
91.862 95.0 100.0 105.0 110.0 115.0 120.0 125.0 130.0 135.0 138.299 140.0 145.0 150.0 155.0 160.0 165.0 166.599 170.0 175.0 180.0 185.0 190.0 194.898 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 448.485 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 1000.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.313 0.41 0.458 0.473 0.467 0.448 0.415 0.363 0.283 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.233 0.281 0.329 0.378 0.426 0.473 0.475 0.558 0.635 0.712 0.792 0.877 0.968 1.067 1.175 1.292 1.421 1.56 1.712 1.875 2.051 2.238 2.436 2.644 2.861 3.085 3.316 3.552 3.792 4.037 4.284 4.534 4.786 5.039 5.293 5.547 5.802 6.055 6.308 6.558 6.807 7.052 7.294 7.53 7.761 7.984 8.199 8.404 8.598 8.777 8.942 9.089 9.216 9.322 9.404 9.462 9.494 9.5 9.499 9.49 9.471 9.441 9.401 9.353 9.296 9.231 9.159 9.08 8.995 8.904 8.808 8.707 8.602 8.494 8.381 8.266 8.148 8.028 7.906 7.783 7.658 7.532 7.405 7.278 7.15 7.022 6.895 6.767 6.64 6.514 6.389 6.264 6.14 6.018 5.896 5.776 5.658 5.54 5.424 5.31 5.197 5.086 4.977 4.869 4.763 4.659 4.556 4.455 4.356 4.259 4.163 4.07 3.978 3.887 3.799 3.712 3.627 3.544 3.462 3.382 3.304 3.227 3.152 3.079 3.007 2.936 2.868 2.8 2.734 2.67 2.607 2.545 2.485 2.426 2.369 2.312 2.257 2.204 2.151 2.1 2.05 2.001 1.953 1.906 1.86 1.816 1.772 1.73 1.688 1.648 1.608 1.569 1.532 1.495 1.459 1.424 1.389 1.356 1.323 1.291 1.26 1.229 1.2 1.171 1.143 1.115 1.088 1.062 1.036

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="0.473" PeakHeight="110.0" Num="3" Error="0.0">
-21.832 4.045 -0.351
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="0.473" EndFrequency="9.5" PeakHeight="448.485" Num="5" zHalfNm="363.197" Error="5.066">
-252.403 -6.613 7.273 -4.684 2.84
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="84.898" Depth="0.273"/>
<TopsideChapman PeakHeight="448.485" PeakDensity="1119727.0" PeakScaleHeight="63.508" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
