<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-02-22 -053 22:50:00.000"
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 1 0 0 0 0 0 0 0 1 0 "/>
<Comments>AR.5002.44 Confidence: 40% PACIFIC flags: Moderate F-spread, F2x cusp not found, Multiple candidates for F2x cusp, Multiple candidates for F2o cusp, One of F2 cusps was derived from the other, 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" >
2026.02.22 (053) 22:50:00</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">
FF202605302222250009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="24" >
<URSI ID="00" Val="9.000" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.884" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="25.957" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="2.600" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="2.600" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="9.350" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="375.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="375.000" 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="0.100" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="8.850" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="437.114" Name="h`(fMUF)" Units="km" QL="/" DL="/" />
<Modeled Name="foEp" Val="0.354" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="4.350" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="4.350" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="397.014" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="374.647" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="7.532" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="35.344" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="8.644" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="18.375" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="58.730" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.000" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="1">
<Trace Type="standard" Layer="F2" Polarization="O" Num="129">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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 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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
405.000 430.000 430.000 430.000 430.000 430.000 430.000 430.000 430.000 430.000 430.000 435.000 445.000 442.500 440.000 437.500 435.000 432.500 430.000 427.500 425.000 425.000 425.000 421.250 417.500 413.750 410.000 406.250 402.500 398.750 395.000 391.250 387.500 383.750 380.000 375.000 380.000 385.000 385.000 386.111 387.222 388.333 389.444 390.556 391.667 392.778 393.889 395.000 396.111 397.222 398.333 399.444 400.556 401.667 402.778 403.889 405.000 405.000 405.000 405.000 415.000 414.615 414.231 413.846 413.462 413.077 412.692 412.308 411.923 411.538 411.154 410.769 410.385 410.000 405.000 405.000 405.000 407.500 410.000 415.000 415.000 411.667 408.333 405.000 405.000 405.000 402.500 400.000 400.417 400.833 401.250 401.667 402.083 402.500 402.917 403.333 403.750 404.167 404.583 405.000 405.417 405.833 406.250 406.667 407.083 407.500 407.917 408.333 408.750 409.167 409.583 410.000 412.500 415.000 420.000 420.000 425.000 426.250 427.500 428.750 429.390 430.185 431.199 432.539 434.390 437.114 441.519 449.856 471.638
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
57 51 57 51 0 60 0 57 0 60 51 60 54 0 0 0 0 0 57 0 54 51 51 0 0 0 54 0 0 0 51 51 0 0 60 54 0 57 51 0 0 0 0 0 0 48 0 0 0 0 57 0 51 0 0 0 60 0 0 54 51 0 54 0 0 0 48 0 0 0 0 0 0 57 54 0 57 0 54 51 57 54 60 51 0 54 0 51 0 0 54 0 60 0 0 0 0 60 57 0 51 60 54 57 57 57 60 57 54 60 57 60 57 54 51 54 54 0 0 0 51 0 51 45 51 54 45 48 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 0.390625 0.390625 -0.390625 -0.390625 0.390625 1.171875 0.390625 -0.390625 0.390625 0.390625 1.171875 1.171875 -0.390625 1.171875 0.390625 -0.390625 1.171875 1.171875 -0.390625 0.390625 -2.734375 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 2.734375 -1.171875 -1.171875 0.390625 0.390625 0.390625 -0.390625 0.390625 1.171875 -0.390625 0.390625 -2.734375 0.390625 -1.171875 -1.171875 1.171875 -0.390625 -0.390625 -0.390625 -1.171875 -0.390625 -0.390625 0.390625 -0.390625 0.390625 0.390625 -2.734375 1.171875 1.171875 0.390625 0.390625 -1.171875 0.390625 -0.390625 0.390625 0.390625 1.171875 1.171875 0.390625 0.390625 -0.390625 -0.390625 0.390625 -0.390625 0.390625 0.390625 1.171875 0.390625 1.171875 -1.953125 -2.734375 0.390625 0.390625 0.390625 0.390625 -0.390625 1.171875 0.390625 -0.390625 0.390625 0.390625 0.390625 0.390625 1.171875 1.171875 0.390625 -0.390625 0.390625 -0.390625 0.390625 1.171875 1.171875 0.390625 -2.734375 -1.171875 -0.390625 0.390625 1.171875 1.171875 -1.171875 1.171875 0.390625 1.171875 0.390625 -1.171875
</TraceValueList>
</Trace>
</TraceList>
<ProfileList Num="1">
<Profile  Algorithm="NH" AlgorithmVersion="4.33" Type="vertical" >
<Tabulated Num="117">
<AltitudeList Type="float" Units="km" Description="Altitude above station level" >
93.502 95.0 100.0 105.0 110.0 115.0 120.0 125.0 130.0 135.0 140.0 143.111 145.0 150.0 155.0 160.0 165.0 170.0 175.0 176.221 180.0 185.0 190.0 195.0 200.0 205.0 209.332 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 397.014 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.234 0.307 0.343 0.354 0.351 0.343 0.328 0.307 0.277 0.235 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.218 0.241 0.264 0.287 0.311 0.334 0.354 0.36 0.422 0.519 0.639 0.758 0.868 0.973 1.075 1.176 1.276 1.377 1.479 1.583 1.691 1.801 1.915 2.034 2.158 2.288 2.425 2.569 2.722 2.885 3.06 3.249 3.454 3.677 3.924 4.2 4.511 4.869 5.289 5.793 6.412 7.167 7.989 8.648 8.971 9.0 8.978 8.849 8.627 8.332 7.985 7.601 7.195 6.779 6.362 5.95 5.549 5.163 4.794 4.444 4.113 3.803 3.512 3.241 2.988 2.754 2.536 2.335 2.149 1.977 1.818 1.672 1.537 1.413 1.299 1.194 1.097 1.008 0.926 0.851 0.782 0.718 0.66 0.606 0.557 0.511 0.47 0.432 0.396 0.364 0.334 0.307 0.282 0.259 0.238 0.219 0.201

</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="9.0" PeakHeight="397.014" Num="5" zHalfNm="374.647" Error="7.897">
-139.217 -71.258 20.328 9.415 -6.95
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="99.332" Depth="0.154"/>
<TopsideChapman PeakHeight="397.014" PeakDensity="1004962.75" PeakScaleHeight="18.375" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
