<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-03-15 -074 22:30:00.000"
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, Unidentified traces above foF2, Trace overlaps while constructing baseline</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" >
2026.03.15 (074) 22:30:00</StartTime>
<SolarTerrestrialData>
<GyroFrequency Val="0.63" Model="IGRF 3.0" Altitude="300"/>
<DipAngle Val="-11.17" 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">
FF202607403152230009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="24" >
<URSI ID="00" Val="8.450" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.726" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="23.039" 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="8.600" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="390.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="390.000" 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="0.200" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="8.450" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="490.000" 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="440.890" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="407.718" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="8.426" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="53.880" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="10.675" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="25.024" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="81.970" 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" >
390.000 395.000 410.000 414.500 419.000 423.500 428.000 432.500 437.000 441.500 446.000 450.500 455.000 455.000 460.000 476.250 492.500 508.750 525.000 520.000 515.000 510.000 505.000 500.000 490.000 487.500 485.000 482.500 480.000 475.000 470.000 465.000 455.000 455.000 450.000 450.000 440.000 440.000 440.000 445.000 450.000 450.000 452.500 455.000 460.000 465.000 466.667 468.333 470.000 475.000 480.000 479.231 478.462 477.692 476.923 476.154 475.385 474.615 473.846 473.077 472.308 471.538 470.769 470.000 455.000 452.500 450.000 448.333 446.667 445.000 450.000 450.000 460.000 460.000 460.000 465.000 467.500 470.000 471.250 472.500 473.750 475.000 473.750 472.500 471.250 470.000 470.000 471.667 473.333 475.000 476.667 478.333 480.000 480.000 480.000 487.500 495.000 497.500 500.000 502.500 505.000 510.000 515.000 490.000
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
51 54 57 0 0 0 0 0 0 0 51 51 57 60 54 0 0 0 48 0 0 51 0 48 51 0 57 0 51 54 0 60 66 63 54 57 57 54 57 60 60 0 54 57 0 57 54 0 57 0 48 0 0 0 0 0 0 0 0 0 51 0 0 54 54 0 63 0 57 57 60 54 60 0 66 63 0 54 60 0 0 60 0 0 63 57 60 51 69 66 69 0 66 60 66 0 51 0 51 0 48 0 51 60
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
0.390625 -0.390625 -0.390625 -0.390625 -1.171875 1.953125 1.953125 0.390625 -1.953125 -1.171875 0.390625 -1.953125 -1.953125 -1.953125 -1.953125 -2.734375 2.734375 -1.171875 -1.953125 -1.171875 -2.734375 -1.171875 -2.734375 -1.953125 -0.390625 -1.953125 -1.953125 1.171875 -0.390625 -1.171875 1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -1.171875 -0.390625 -1.171875 -0.390625 -1.171875 -0.390625 -1.953125 -1.171875 -0.390625 -1.171875 -0.390625 -1.953125 -0.390625 -0.390625 0.390625 -1.171875 1.953125 1.953125 -1.171875 -1.953125 -2.734375 -2.734375 0.390625 -1.953125 1.171875 -0.390625 -1.953125 -1.171875 -0.390625 0.390625 1.171875 0.390625 0.390625 1.171875 0.390625 0.390625 1.171875 0.390625 0.390625 1.171875 0.390625 -0.390625 -1.953125 1.171875 2.734375 2.734375 0.390625 -2.734375 0.390625 0.390625 0.390625 1.171875 1.171875 0.390625 0.390625 0.390625 0.390625 1.171875 1.171875 0.390625 0.390625 -1.171875 0.390625 0.390625 -2.734375 -2.734375 -1.171875 -1.171875 0.390625
</TraceValueList>
</Trace>
</TraceList>
<ProfileList Num="1">
<Profile  Algorithm="NH" AlgorithmVersion="4.33" Type="vertical" >
<Tabulated Num="143">
<AltitudeList Type="float" Units="km" Description="Altitude above station level" >
93.502 95.0 100.0 105.0 110.0 115.0 120.0 125.0 130.0 135.0 140.0 142.438 145.0 150.0 155.0 160.0 165.0 170.0 174.875 175.0 180.0 185.0 190.0 195.0 200.0 205.0 207.313 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 440.89 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.234 0.307 0.343 0.354 0.351 0.342 0.327 0.305 0.273 0.229 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.201 0.224 0.248 0.272 0.296 0.319 0.343 0.354 0.378 0.434 0.511 0.607 0.714 0.822 0.929 1.034 1.138 1.241 1.344 1.447 1.551 1.656 1.762 1.87 1.98 2.093 2.207 2.325 2.445 2.569 2.696 2.827 2.962 3.102 3.246 3.396 3.551 3.712 3.879 4.054 4.237 4.428 4.629 4.84 5.063 5.3 5.551 5.82 6.11 6.424 6.767 7.146 7.571 8.041 8.435 8.45 8.429 8.349 8.219 8.047 7.84 7.606 7.352 7.082 6.802 6.516 6.228 5.94 5.656 5.377 5.105 4.84 4.584 4.338 4.101 3.874 3.658 3.452 3.255 3.069 2.891 2.724 2.565 2.414 2.272 2.138 2.012 1.892 1.78 1.674 1.574 1.48 1.391 1.307 1.229 1.155 1.086 1.02 0.959 0.901 0.847 0.796 0.748 0.702 0.66 0.62 0.583 0.548 0.514 0.483 0.454 0.427 0.401 0.377 0.354 0.332 0.312 0.293 0.276 0.259 0.243 0.229 0.215 0.202

</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="440.89" Num="5" zHalfNm="407.718" Error="7.184">
-180.17 -90.253 47.061 -7.754 -2.461
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="97.313" Depth="0.154"/>
<TopsideChapman PeakHeight="440.89" PeakDensity="885887.1" PeakScaleHeight="25.024" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
