<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-01-28 -028 23:40:00.000"
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 33 2 0 0 0 0 0 0 0 1 0 "/>
<Comments>AR.5002.44 Confidence: 65% PACIFIC flags: Severe F-spread, 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" >
2026.01.28 (028) 23:40:00</StartTime>
<SolarTerrestrialData>
<GyroFrequency Val="0.63" Model="IGRF 3.0" Altitude="300"/>
<DipAngle Val="-11.12" 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">
FF202602801282340009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="25" >
<URSI ID="00" Val="7.700" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.839" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="21.863" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="4.600" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="4.600" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="8.300" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="400.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="400.000" 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="0.300" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="7.350" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="425.985" 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="0.354" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="6.550" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="6.550" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="383.930" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="343.427" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="5.856" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="61.813" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="9.765" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="29.604" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="71.440" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.320" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="1">
<Trace Type="standard" Layer="F2" Polarization="O" Num="63">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
430.000 430.000 430.000 430.000 430.000 430.000 430.000 430.000 430.000 430.000 425.000 425.000 424.107 423.214 422.321 421.429 420.536 419.643 418.750 417.857 416.964 416.071 415.179 414.286 413.393 412.500 411.607 410.714 409.821 408.929 408.036 407.143 406.250 405.357 404.464 403.571 402.679 401.786 400.893 400.000 403.333 406.667 410.000 410.000 410.000 410.000 411.538 413.077 414.036 415.112 416.330 417.719 419.317 421.177 423.367 425.985 429.169 433.124 438.172 444.836 454.039 467.576 489.451
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
54 0 57 0 60 54 57 0 54 51 51 57 0 0 0 0 0 0 54 0 0 0 51 54 51 54 54 0 0 0 0 51 0 54 0 0 0 0 54 57 0 57 0 51 51 54 51 0 0 0 0 0 0 0 0 0 0 0 51 0 51 54 48
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
-0.390625 1.953125 -1.171875 1.171875 -0.390625 -1.171875 -1.171875 0.390625 -1.171875 1.171875 -0.390625 -1.171875 1.953125 1.953125 -1.171875 -0.390625 2.734375 -1.171875 1.953125 1.953125 -2.734375 0.390625 -0.390625 -0.390625 -0.390625 0.390625 0.390625 -0.390625 1.171875 0.390625 -2.734375 -1.171875 -0.390625 1.171875 -1.171875 1.953125 1.171875 -0.390625 1.171875 1.171875 0.390625 -0.390625 0.390625 0.390625 -0.390625 -1.171875 0.390625 -0.390625 -0.390625 -0.390625 0.390625 1.171875 -2.734375 -1.953125 0.390625 -1.171875 1.953125 0.390625 -2.734375 2.734375 -0.390625 0.390625 1.953125
</TraceValueList>
</Trace>
</TraceList>
<ProfileList Num="1">
<Profile  Algorithm="NH" AlgorithmVersion="4.33" Type="vertical" >
<Tabulated Num="142">
<AltitudeList Type="float" Units="km" Description="Altitude above station level" >
93.502 95.0 100.0 105.0 110.0 115.0 120.0 125.0 130.0 135.0 140.0 144.799 145.0 150.0 155.0 160.0 165.0 170.0 175.0 179.598 180.0 185.0 190.0 195.0 200.0 205.0 210.0 214.397 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 383.93 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.234 0.307 0.343 0.354 0.352 0.344 0.331 0.312 0.285 0.249 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.202 0.224 0.246 0.268 0.29 0.312 0.335 0.354 0.362 0.437 0.523 0.623 0.74 0.875 1.027 1.195 1.374 1.563 1.758 1.959 2.164 2.374 2.587 2.803 3.024 3.249 3.478 3.713 3.952 4.198 4.45 4.709 4.976 5.251 5.535 5.829 6.134 6.448 6.771 7.095 7.399 7.632 7.7 7.699 7.67 7.603 7.504 7.377 7.226 7.055 6.869 6.67 6.462 6.246 6.027 5.806 5.584 5.363 5.144 4.929 4.718 4.512 4.312 4.117 3.929 3.747 3.571 3.402 3.24 3.084 2.935 2.792 2.655 2.524 2.399 2.28 2.167 2.058 1.955 1.857 1.763 1.674 1.59 1.509 1.433 1.36 1.291 1.225 1.163 1.103 1.047 0.993 0.943 0.894 0.849 0.805 0.764 0.725 0.688 0.652 0.619 0.587 0.557 0.528 0.501 0.476 0.451 0.428 0.406 0.385 0.365 0.347 0.329 0.312 0.296 0.281 0.266 0.253 0.24 0.227 0.216 0.205

</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="7.7" PeakHeight="383.93" Num="5" zHalfNm="343.427" Error="4.503">
-148.522 -38.213 25.726 -10.729 2.205
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="104.397" Depth="0.154"/>
<TopsideChapman PeakHeight="383.93" PeakDensity="735607.94" PeakScaleHeight="29.604" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
