<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-02-28 -059 23:10:00.000"
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 0 0 0 0 0 0 0 0 1 0 "/>
<Comments>AR.5002.44 Confidence: 40% PACIFIC flags: 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" >
2026.02.28 (059) 23:10:00</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">
FF202605902282310009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="25" >
<URSI ID="00" Val="9.300" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.626" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="24.420" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="5.850" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="5.850" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="9.800" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="435.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="435.000" 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="0.500" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="8.900" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="485.000" 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="5.850" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="5.850" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="424.232" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="367.356" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="7.354" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="85.626" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="19.661" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="41.817" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="92.610" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.550" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="1">
<Trace Type="standard" Layer="F2" Polarization="O" Num="70">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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 9.05 9.1 9.15 9.2 9.25 9.3
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
435.000 435.000 437.500 440.000 440.000 440.000 440.000 440.000 440.000 440.000 445.000 445.000 445.000 445.000 440.000 440.000 442.500 445.000 445.000 445.000 445.000 445.000 450.000 455.000 455.000 452.500 450.000 450.000 455.000 455.000 460.000 460.000 465.000 465.000 467.500 470.000 470.000 470.000 470.000 470.000 472.500 475.000 475.000 477.500 480.000 482.500 485.000 487.500 490.000 490.000 492.500 495.000 470.000 470.000 475.000 475.000 475.000 475.000 477.500 480.000 485.000 485.000 488.490 492.662 497.736 504.041 512.086 522.707 537.377 558.957
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
48 51 0 51 54 0 63 63 63 60 57 57 63 60 57 57 0 54 57 60 63 66 63 63 60 0 66 72 66 72 66 66 72 75 66 72 72 66 75 72 0 69 72 66 69 0 66 57 72 75 0 66 69 69 69 72 69 75 66 66 66 66 63 57 63 69 54 0 0 0
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
-1.953125 -1.953125 -1.171875 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -1.953125 -2.734375 -1.953125 -1.171875 -2.734375 0.390625 0.390625 0.390625 0.390625 0.390625 -2.734375 -2.734375 0.390625 -2.734375 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 1.171875 0.390625 0.390625 0.390625 0.390625 1.953125 0.390625 0.390625 0.390625 1.953125 0.390625 -1.171875 -1.171875 -1.171875 -1.171875 -1.953125 -1.171875 -1.953125 -1.171875 -1.953125 -1.953125 -1.171875 -1.171875 0.390625 0.390625 -0.390625 1.953125 -0.390625 2.734375
</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 95.0 100.0 105.0 110.0 115.0 120.0 125.0 130.0 135.0 140.0 144.087 145.0 150.0 155.0 160.0 165.0 170.0 175.0 178.174 180.0 185.0 190.0 195.0 200.0 205.0 210.0 212.261 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 424.232 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 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 0.343 0.33 0.31 0.282 0.243 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.208 0.231 0.253 0.276 0.299 0.321 0.344 0.354 0.397 0.472 0.549 0.632 0.726 0.831 0.95 1.084 1.234 1.401 1.581 1.775 1.979 2.191 2.411 2.635 2.865 3.098 3.334 3.574 3.818 4.064 4.313 4.566 4.823 5.083 5.347 5.615 5.887 6.163 6.443 6.727 7.014 7.305 7.598 7.89 8.179 8.46 8.724 8.959 9.147 9.266 9.3 9.3 9.283 9.243 9.181 9.1 9.0 8.885 8.756 8.615 8.463 8.302 8.134 7.959 7.779 7.595 7.409 7.22 7.031 6.841 6.652 6.463 6.276 6.091 5.908 5.727 5.55 5.376 5.205 5.038 4.875 4.715 4.56 4.408 4.26 4.116 3.976 3.84 3.709 3.581 3.456 3.336 3.219 3.107 2.997 2.891 2.789 2.69 2.594 2.502 2.413 2.326 2.243 2.162 2.084 2.009 1.937 1.867 1.799 1.734 1.671 1.611 1.552 1.496 1.442 1.389 1.339 1.29 1.243 1.198 1.154 1.112 1.071 1.032 0.995 0.958 0.923 0.889 0.857 0.826 0.795 0.766 0.738 0.711 0.685 0.66 0.636 0.613 0.59 0.569 0.548 0.528 0.508 0.49 0.472 0.455 0.438 0.422 0.406 0.391 0.377 0.363 0.35 0.337 0.325 0.313 0.301 0.29 0.28 0.269 0.26 0.25 0.241 0.232 0.224 0.215 0.207

</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="9.3" PeakHeight="424.232" Num="5" zHalfNm="367.356" Error="3.985">
-196.742 -30.995 23.726 -11.709 3.749
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="102.261" Depth="0.154"/>
<TopsideChapman PeakHeight="424.232" PeakDensity="1073076.9" PeakScaleHeight="41.817" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
