<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-02-23 -054 21:10:00.000"
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" >
2026.02.23 (054) 21:10:00</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">
FF202605402232110009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="24" >
<URSI ID="00" Val="10.750" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.606" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="28.013" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="2.800" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="2.800" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="11.050" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="270.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="270.000" 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="0.150" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="9.750" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="452.000" Name="h`(fMUF)" Units="km" QL="/" DL="/" />
<Modeled Name="foEp" Val="1.196" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="2.800" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="2.800" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="373.434" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="289.308" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="8.190" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="120.236" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="37.854" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="61.687" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="122.810" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.880" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="1">
<Trace Type="standard" Layer="F2" Polarization="O" Num="160">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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 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 10.65 10.7 10.75
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
270.000 272.500 275.000 275.000 275.000 275.000 275.000 275.000 275.000 275.000 275.000 275.000 275.000 275.000 275.000 275.000 275.000 280.000 280.000 280.000 280.870 281.739 282.609 283.478 284.348 285.217 286.087 286.957 287.826 288.696 289.565 290.435 291.304 292.174 293.043 293.913 294.783 295.652 296.522 297.391 298.261 299.130 300.000 300.000 300.000 300.000 300.000 300.000 300.000 300.000 305.000 305.000 305.000 305.000 305.000 305.000 305.000 307.500 310.000 312.500 315.000 317.500 320.000 320.000 320.000 320.000 320.000 322.500 325.000 325.000 325.000 325.000 330.000 330.000 330.000 330.000 330.000 335.000 335.000 335.000 335.000 335.000 340.000 340.000 340.000 345.000 345.000 345.000 345.000 350.000 350.000 352.500 355.000 355.000 355.000 360.000 360.000 360.000 360.000 365.000 365.000 365.000 365.000 370.000 370.000 370.000 375.000 375.000 375.000 380.000 380.000 380.000 385.000 385.000 390.000 390.000 395.000 395.000 395.000 400.000 400.000 405.000 405.000 410.000 410.000 415.000 415.000 420.000 420.000 425.000 425.000 430.000 435.000 435.000 440.000 440.000 443.000 446.000 449.000 452.000 455.000 460.000 465.000 470.000 475.000 480.000 485.000 490.000 495.000 500.000 505.000 515.000 520.000 526.278 533.179 540.802 549.265 558.715 569.336 581.360
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
75 66 66 66 63 60 0 66 63 60 57 0 63 0 57 0 51 60 57 60 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 48 54 0 0 0 0 75 78 0 0 75 0 72 60 0 0 0 0 48 57 0 66 0 69 54 57 60 0 66 54 0 0 72 69 60 0 0 72 72 66 69 69 63 66 63 63 63 66 0 63 0 69 57 63 69 69 63 69 69 69 69 72 69 69 72 69 72 72 66 69 69 66 69 60 69 69 66 69 63 69 63 69 63 66 63 66 60 66 63 54 63 57 63 0 0 60 0 60 60 60 60 60 60 57 54 54 51 51 48 48 45 45 0 48 51 48 48
</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 -2.734375 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 1.953125 -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 -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 -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 -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 -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 -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 -1.171875 1.953125 -0.390625 -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 -0.390625 -1.171875 -1.171875 -1.171875 -0.390625 -1.171875 -1.171875 -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" >
90.105 95.0 100.0 105.0 110.0 115.0 120.0 123.942 125.0 130.0 135.0 137.884 140.0 145.0 150.0 151.826 155.0 160.0 165.0 170.0 175.0 180.0 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 373.434 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 1000.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.798 1.036 1.158 1.196 1.175 1.112 1.027 1.027 1.027 1.027 1.027 1.053 1.113 1.174 1.196 1.291 1.422 1.547 1.674 1.805 1.944 2.092 2.253 2.428 2.619 2.828 3.056 3.303 3.567 3.846 4.136 4.434 4.736 5.039 5.342 5.643 5.94 6.233 6.523 6.808 7.089 7.366 7.639 7.907 8.17 8.429 8.682 8.929 9.169 9.401 9.624 9.835 10.033 10.213 10.374 10.511 10.62 10.698 10.741 10.75 10.749 10.738 10.715 10.679 10.631 10.573 10.505 10.428 10.342 10.248 10.147 10.039 9.925 9.806 9.682 9.553 9.421 9.285 9.146 9.005 8.861 8.716 8.57 8.423 8.274 8.126 7.977 7.828 7.68 7.532 7.385 7.239 7.093 6.949 6.806 6.665 6.525 6.387 6.251 6.116 5.983 5.852 5.723 5.596 5.471 5.348 5.228 5.109 4.992 4.878 4.766 4.655 4.547 4.441 4.337 4.236 4.136 4.038 3.942 3.849 3.757 3.667 3.58 3.494 3.41 3.328 3.247 3.169 3.092 3.017 2.944 2.872 2.802 2.734 2.667 2.602 2.538 2.476 2.415 2.356 2.298 2.242 2.186 2.132 2.08 2.029 1.978 1.93 1.882 1.835 1.79 1.746 1.702 1.66 1.619 1.579 1.54 1.501 1.464 1.428 1.392 1.358 1.324 1.291 1.259 1.227 1.197 1.167 1.138 1.11 1.082 1.055 1.029 1.003 0.978 0.954 0.93 0.907 0.884 0.862 0.841 0.82 0.799 0.779 0.76 0.741

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="1.196" PeakHeight="110.0" Num="3" Error="0.0">
-27.267 8.853 -1.481
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="1.196" EndFrequency="10.75" PeakHeight="373.434" Num="5" zHalfNm="289.308" Error="6.006">
-212.108 -14.485 8.146 -6.91 3.749
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="41.826" Depth="0.169"/>
<TopsideChapman PeakHeight="373.434" PeakDensity="1433777.9" PeakScaleHeight="61.687" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
