<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-02-22 -053 23:30:00.000"
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 55 1 0 0 0 0 0 0 0 1 0 "/>
<Comments>AR.5002.44 Confidence: 20% PACIFIC flags: Moderate F-spread, F2o cusp not found, Multiple candidates for F2x cusp, Multiple candidates for F2o cusp, One of F2 cusps was derived from the other, F2O model cusp does not fit trace, 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) 23:30:00</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">
FF202605302222330009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="23" >
<URSI ID="00" Val="3.550" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.984" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="10.592" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="2.550" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="2.550" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="3.750" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="325.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="325.000" 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="88" Val="3.200" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="357.231" Name="h`(fMUF)" Units="km" QL="/" DL="/" />
<Modeled Name="foEp" Val="0.354" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="2.550" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="2.550" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="393.923" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="285.371" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="7.163" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="152.622" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="5.307" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="84.028" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="121.420" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="5.480" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="1">
<Trace Type="standard" Layer="F2" Polarization="O" Num="21">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
325.000 325.000 325.000 325.000 333.750 342.500 351.250 360.000 365.000 370.000 375.000 395.000 400.000 357.231 370.000 385.000 410.000 440.000 490.000 580.000 777.492
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
54 60 0 63 0 0 0 60 0 0 54 51 0 0 54 0 0 51 51 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 1.171875 0.390625 0.390625 -0.390625 2.734375 -0.390625 -0.390625 -0.390625 2.734375 -0.390625 0.390625 0.390625 -1.171875 -1.171875 -2.734375 -1.171875
</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" >
93.502 95.0 100.0 105.0 110.0 115.0 120.0 125.0 130.0 135.0 140.0 144.715 145.0 150.0 155.0 160.0 165.0 170.0 175.0 179.43 180.0 185.0 190.0 195.0 200.0 205.0 210.0 214.145 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 393.923 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 1000.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.234 0.307 0.343 0.354 0.351 0.344 0.331 0.311 0.285 0.248 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.203 0.225 0.247 0.269 0.291 0.313 0.336 0.354 0.419 0.496 0.556 0.615 0.675 0.74 0.812 0.896 0.995 1.121 1.295 1.564 1.953 2.276 2.497 2.66 2.79 2.897 2.988 3.066 3.135 3.195 3.248 3.295 3.338 3.375 3.408 3.437 3.462 3.484 3.502 3.517 3.53 3.539 3.546 3.549 3.55 3.55 3.548 3.544 3.538 3.529 3.519 3.506 3.492 3.476 3.458 3.438 3.418 3.395 3.371 3.347 3.32 3.293 3.265 3.236 3.206 3.175 3.143 3.111 3.078 3.045 3.011 2.977 2.942 2.907 2.872 2.836 2.801 2.765 2.729 2.693 2.657 2.621 2.585 2.549 2.513 2.477 2.441 2.406 2.371 2.335 2.3 2.266 2.231 2.197 2.163 2.13 2.096 2.063 2.031 1.998 1.966 1.934 1.903 1.872 1.841 1.811 1.781 1.752 1.723 1.694 1.665 1.637 1.61 1.582 1.555 1.529 1.503 1.477 1.452 1.427 1.402 1.378 1.354 1.33 1.307 1.284 1.262 1.239 1.218 1.196 1.175 1.154 1.134 1.114 1.094 1.075 1.055 1.037 1.018 1.0 0.982 0.965 0.947 0.93 0.914 0.897 0.881 0.865 0.85 0.834 0.819 0.804 0.79 0.775 0.761 0.748 0.734 0.721 0.708 0.695 0.682 0.67 0.658 0.646 0.634 0.622 0.611

</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="3.55" PeakHeight="393.923" Num="5" zHalfNm="285.371" Error="16.265">
-235.125 83.692 -45.721 17.376 0.0
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="104.145" Depth="0.154"/>
<TopsideChapman PeakHeight="393.923" PeakDensity="156358.56" PeakScaleHeight="84.028" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
