<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-02-28 -059 00:50:00.000"
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: 50% PACIFIC flags: Moderate F-spread, F2o cusp not found, F2 cusps do not match</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" >
2026.02.28 (059) 00:50:00</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">
FF202605902280050009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="24" >
<URSI ID="00" Val="8.450" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="3.017" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="25.498" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="3.300" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="3.300" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="5.700" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="405.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="405.000" 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="8.450" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="415.000" Name="h`(fMUF)" Units="km" QL="/" DL="/" />
<Modeled Name="foEp" Val="0.354" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="3.300" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="3.300" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="400.921" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="384.119" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="6.335" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="30.066" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="6.033" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="12.714" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="61.870" 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="104">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
405.000 415.000 420.000 425.000 435.000 435.000 435.000 440.000 440.000 437.500 435.000 435.000 435.000 436.667 438.333 440.000 440.000 440.000 440.000 440.000 440.000 440.000 440.000 440.000 440.000 440.333 440.667 441.000 441.333 441.667 442.000 442.333 442.667 443.000 443.333 443.667 444.000 444.333 444.667 445.000 445.000 440.000 440.000 440.000 440.000 440.000 440.000 440.000 440.000 440.000 440.000 439.500 439.000 438.500 438.000 437.500 437.000 436.500 436.000 435.500 435.000 438.333 441.667 445.000 445.000 445.000 445.000 445.000 445.000 440.000 440.000 440.000 440.000 440.000 440.000 435.000 430.000 425.000 424.286 423.571 422.857 422.143 421.429 420.714 420.000 420.000 420.000 430.000 430.000 440.000 450.000 448.889 447.778 446.667 445.556 444.444 443.333 442.222 441.111 440.000 440.000 425.000 420.000 415.000
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
0 54 0 51 54 54 54 48 51 0 48 0 48 0 0 48 0 0 57 54 0 57 57 0 57 0 54 0 0 0 0 0 0 0 51 0 0 51 0 51 57 54 51 0 0 0 0 51 57 0 54 0 0 0 0 0 54 0 0 0 51 0 0 54 0 60 0 51 54 54 0 51 54 54 51 0 0 51 0 0 0 0 0 0 48 0 51 48 48 48 48 45 48 51 48 0 0 51 0 48 48 48 0 48
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
-1.171875 -1.171875 -1.171875 -1.171875 -0.390625 -1.171875 -1.171875 -0.390625 -1.171875 -1.171875 -1.171875 -0.390625 -1.171875 1.171875 -0.390625 -1.171875 -0.390625 -1.171875 -0.390625 -1.171875 -1.171875 -1.171875 -1.171875 -1.953125 -0.390625 -1.953125 -1.171875 -1.171875 0.390625 -1.171875 0.390625 -1.171875 -1.171875 -1.953125 -1.171875 -1.953125 -0.390625 -1.171875 -2.734375 -1.171875 -1.171875 -1.171875 -1.953125 1.171875 -0.390625 -0.390625 1.171875 -1.953125 -1.953125 -1.171875 -1.953125 -1.171875 1.171875 -1.953125 -0.390625 0.390625 -1.171875 0.390625 -2.734375 -0.390625 0.390625 -1.171875 0.390625 -1.171875 0.390625 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 1.171875 -0.390625 -1.953125 -1.953125 0.390625 0.390625 2.734375 0.390625 0.390625 -2.734375 -2.734375 -0.390625 -2.734375 1.953125 1.171875 1.171875 0.390625 1.171875 0.390625 0.390625 0.390625 1.171875 0.390625 0.390625 1.171875 1.953125 1.953125 0.390625 -0.390625 1.171875 0.390625 -0.390625 2.734375 0.390625
</TraceValueList>
</Trace>
</TraceList>
<ProfileList Num="1">
<Profile  Algorithm="NH" AlgorithmVersion="4.33" Type="vertical" >
<Tabulated Num="101">
<AltitudeList Type="float" Units="km" Description="Altitude above station level" >
93.502 95.0 100.0 105.0 110.0 115.0 120.0 125.0 130.0 135.0 140.0 145.0 146.605 150.0 155.0 160.0 165.0 170.0 175.0 180.0 183.21 185.0 190.0 195.0 200.0 205.0 210.0 215.0 219.815 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 400.921 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.234 0.307 0.343 0.354 0.352 0.345 0.333 0.316 0.292 0.261 0.217 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.208 0.229 0.25 0.271 0.292 0.313 0.334 0.354 0.357 0.461 0.581 0.706 0.83 0.952 1.074 1.195 1.318 1.441 1.566 1.694 1.824 1.957 2.093 2.232 2.376 2.524 2.676 2.834 2.997 3.166 3.341 3.524 3.715 3.915 4.125 4.346 4.579 4.827 5.093 5.38 5.692 6.039 6.434 6.906 7.555 8.45 8.371 8.093 7.674 7.167 6.614 6.048 5.49 4.955 4.453 3.987 3.561 3.173 2.823 2.508 2.226 1.974 1.75 1.55 1.373 1.215 1.076 0.952 0.842 0.745 0.659 0.583 0.516 0.456 0.403 0.357 0.316 0.279 0.247 0.218

</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="8.45" PeakHeight="400.921" Num="5" zHalfNm="384.119" Error="18.55">
-128.306 -90.954 47.817 -9.663 0.0
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="109.815" Depth="0.154"/>
<TopsideChapman PeakHeight="400.921" PeakDensity="885887.1" PeakScaleHeight="12.714" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
