<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-02-27 -058 22:50:00.000"
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 0 0 0 0 0 0 0 0 1 0 "/>
<Comments>AR.5002.44 Confidence: 40% PACIFIC flags: 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</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" >
2026.02.27 (058) 22:50:00</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">
FF202605802272250009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="25" >
<URSI ID="00" Val="8.350" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.424" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="20.237" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="3.850" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="3.850" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="8.850" 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="0.200" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="7.750" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="526.538" 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="3.850" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="3.850" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="458.673" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="389.764" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="7.533" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="102.929" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="19.286" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="51.210" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="110.980" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.560" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="1">
<Trace Type="standard" Layer="F2" Polarization="O" Num="91">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
405.000 405.000 405.000 405.000 405.000 405.000 410.000 420.000 410.000 412.500 415.000 417.500 420.000 420.000 420.000 410.000 420.000 420.000 420.000 420.000 420.000 425.000 430.000 432.500 435.000 435.000 435.000 435.000 435.000 435.000 440.000 440.000 440.000 445.000 450.000 440.000 450.000 455.000 455.000 455.000 460.000 460.000 465.000 465.000 465.000 465.000 470.000 470.000 470.000 475.000 475.000 480.000 480.000 480.000 485.000 485.000 485.000 490.000 490.000 492.500 495.000 500.000 500.000 500.000 500.000 502.500 505.000 505.000 506.667 508.333 510.000 510.000 510.000 512.500 515.000 517.500 520.000 520.000 526.538 533.077 539.615 546.154 552.692 559.231 565.769 572.308 578.846 585.385 591.923 598.462 605.000
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
51 54 0 0 0 48 0 51 69 0 66 0 60 69 60 54 60 66 63 0 0 0 63 0 63 63 0 66 0 0 63 60 66 0 51 66 63 66 66 63 60 72 57 60 0 66 66 72 69 66 66 57 63 69 66 66 66 60 66 60 66 63 66 63 66 63 63 63 0 0 60 60 63 0 63 60 66 57 60 69 63 0 48 60 60 60 48 48 48 45 54
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
-1.171875 -0.390625 0.390625 0.390625 -1.171875 0.390625 -0.390625 0.390625 0.390625 0.390625 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 -0.390625 -0.390625 -0.390625 -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 -0.390625 -0.390625 0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -1.171875 -1.171875 -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 2.734375 -0.390625 -0.390625 -0.390625 1.953125 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -1.171875 -1.171875 -0.390625 -1.171875 -0.390625 -0.390625 -0.390625 0.390625 -0.390625 0.390625 1.953125 -0.390625
</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 95.0 100.0 105.0 110.0 115.0 120.0 125.0 130.0 135.0 140.0 143.196 145.0 150.0 155.0 160.0 165.0 170.0 175.0 176.391 180.0 185.0 190.0 195.0 200.0 205.0 209.587 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 458.673 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 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 0.328 0.307 0.277 0.236 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.217 0.24 0.263 0.286 0.31 0.333 0.354 0.359 0.416 0.479 0.547 0.622 0.704 0.793 0.889 0.993 1.104 1.223 1.347 1.478 1.615 1.757 1.904 2.056 2.212 2.373 2.538 2.706 2.879 3.056 3.236 3.42 3.608 3.8 3.996 4.195 4.398 4.604 4.815 5.028 5.246 5.466 5.689 5.915 6.143 6.372 6.602 6.831 7.058 7.28 7.494 7.696 7.883 8.046 8.181 8.28 8.337 8.35 8.349 8.338 8.312 8.273 8.221 8.158 8.085 8.002 7.91 7.811 7.704 7.592 7.474 7.352 7.226 7.096 6.963 6.829 6.692 6.554 6.416 6.277 6.137 5.998 5.86 5.722 5.586 5.45 5.316 5.184 5.053 4.924 4.797 4.672 4.549 4.429 4.311 4.195 4.081 3.97 3.861 3.754 3.65 3.548 3.449 3.352 3.257 3.165 3.075 2.987 2.902 2.818 2.737 2.658 2.581 2.506 2.434 2.363 2.294 2.227 2.162 2.098 2.037 1.977 1.918 1.862 1.807 1.754 1.702 1.651 1.602 1.555 1.509 1.464 1.42 1.378 1.337 1.297 1.259 1.221 1.185 1.149 1.115 1.082 1.049 1.018 0.988 0.958 0.929 0.902 0.875 0.848 0.823 0.798 0.775 0.751 0.729 0.707 0.686 0.665 0.645 0.626 0.607 0.589 0.571 0.554 0.537 0.521 0.506

</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="8.35" PeakHeight="458.673" Num="5" zHalfNm="389.764" Error="2.146">
-233.126 -32.402 23.184 -8.52 1.778
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="99.587" Depth="0.154"/>
<TopsideChapman PeakHeight="458.673" PeakDensity="865043.44" PeakScaleHeight="51.21" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
