<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-02-26 -057 16:50:00.000"
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 11 0 0 0 0 0 0 0 0 1 0 "/>
<Comments>AR.5002.44 Confidence: 90% PACIFIC flags: 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" >
2026.02.26 (057) 16:50:00</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">
FF202605702261650009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="26" >
<URSI ID="00" Val="10.600" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.513" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="26.635" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="4.500" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="4.500" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="10.900" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="215.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="215.000" 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="10.200" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="525.000" 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="3.295" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="4.500" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="4.500" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<Modeled Name="foF1p" Val="4.316" Units="MHz" ModelName="IRI-90" />
<URSI ID="92" Val="360.690" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="257.136" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="8.046" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="128.833" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="44.785" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="72.405" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="182.720" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.080" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="1">
<Trace Type="standard" Layer="F2" Polarization="O" Num="123">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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 9.55 9.6 9.65 9.7 9.75 9.8 9.85 9.9 9.95 10.0 10.05 10.1 10.15 10.2 10.25 10.3 10.35 10.4 10.45 10.5 10.55 10.6
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
215.000 220.000 225.000 230.000 235.000 240.000 245.000 250.000 260.000 265.000 270.000 270.000 275.000 278.000 281.000 284.000 287.000 290.000 295.000 300.000 300.000 300.000 303.750 307.500 311.250 315.000 320.000 322.500 325.000 326.250 327.500 328.750 330.000 330.000 330.000 332.500 335.000 337.500 340.000 345.000 350.000 350.000 352.500 355.000 357.500 360.000 362.500 365.000 367.500 370.000 372.500 375.000 375.000 380.000 381.667 383.333 385.000 385.000 390.000 395.000 395.000 395.000 397.500 400.000 402.500 405.000 407.500 410.000 410.000 412.500 415.000 417.500 420.000 422.500 425.000 427.500 430.000 435.000 435.000 435.000 440.000 445.000 447.500 450.000 452.500 455.000 455.000 457.500 460.000 465.000 465.000 470.000 475.000 475.000 475.000 480.000 480.000 480.000 485.000 487.500 490.000 490.000 495.000 495.000 500.000 500.000 505.000 507.500 510.000 510.000 515.000 520.000 520.000 525.000 525.000 530.000 535.000 540.000 545.000 550.000 556.981 565.325 575.473
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
48 45 45 48 45 0 54 51 54 54 51 57 57 0 0 0 0 57 54 51 0 48 0 0 0 48 45 0 48 0 51 0 63 63 57 0 63 54 54 0 57 0 0 0 54 0 0 0 51 0 0 54 54 48 0 0 54 57 54 45 54 54 0 51 0 45 0 48 54 0 0 0 45 0 0 0 54 45 0 51 51 45 0 0 0 48 48 0 48 48 48 48 42 48 51 48 54 54 54 48 51 48 51 51 48 51 48 0 45 48 45 45 48 48 48 48 51 51 51 48 0 0 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 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 1.953125 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 1.171875 1.953125 0.390625 0.390625 0.390625 0.390625 -0.390625 -0.390625 0.390625 -1.953125 -1.171875 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 0.390625 1.171875 -0.390625 -1.171875 1.953125 -2.734375 0.390625 0.390625 2.734375 -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 -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 -2.734375 -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 -2.734375 -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" >
89.497 90.0 95.0 100.0 105.0 110.0 111.942 113.885 115.0 115.827 120.0 125.0 130.0 135.0 140.0 145.0 150.0 155.0 160.0 165.0 170.0 175.0 180.0 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 360.69 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 1000.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.24 2.216 2.852 3.188 3.295 3.173 3.173 3.243 3.295 3.397 3.524 3.657 3.794 3.935 4.081 4.229 4.379 4.531 4.685 4.84 4.994 5.149 5.304 5.459 5.613 5.767 5.92 6.073 6.225 6.376 6.528 6.679 6.829 6.98 7.13 7.28 7.431 7.582 7.733 7.885 8.037 8.19 8.344 8.5 8.656 8.814 8.974 9.135 9.298 9.463 9.629 9.797 9.965 10.132 10.292 10.437 10.549 10.599 10.6 10.596 10.583 10.561 10.531 10.492 10.445 10.391 10.33 10.263 10.189 10.111 10.026 9.937 9.844 9.746 9.645 9.54 9.432 9.321 9.208 9.092 8.975 8.856 8.735 8.614 8.491 8.367 8.243 8.118 7.994 7.869 7.744 7.619 7.494 7.37 7.247 7.124 7.002 6.881 6.761 6.642 6.523 6.406 6.29 6.176 6.062 5.95 5.839 5.73 5.622 5.516 5.411 5.307 5.205 5.104 5.005 4.908 4.812 4.717 4.624 4.533 4.443 4.354 4.267 4.182 4.098 4.015 3.934 3.854 3.776 3.699 3.624 3.55 3.477 3.406 3.336 3.268 3.2 3.134 3.069 3.006 2.944 2.883 2.823 2.764 2.707 2.65 2.595 2.541 2.488 2.435 2.384 2.335 2.286 2.238 2.191 2.145 2.099 2.055 2.012 1.97 1.928 1.887 1.848 1.809 1.77 1.733 1.696 1.66 1.625 1.591 1.557 1.524 1.492 1.46 1.429 1.399 1.369 1.34 1.312 1.284 1.257 1.23 1.204 1.178 1.153 1.129 1.105

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="3.295" PeakHeight="110.0" Num="3" Error="0.0">
-30.431 13.048 -3.12
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="3.295" EndFrequency="10.6" PeakHeight="360.69" Num="5" zHalfNm="257.136" Error="3.451">
-193.712 -71.846 27.57 -7.509 0.634
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="5.827" Depth="0.122"/>
<TopsideChapman PeakHeight="360.69" PeakDensity="1394044.6" PeakScaleHeight="72.405" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
