<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-02-26 -057 23:50:00.000"
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: 40% PACIFIC flags: Moderate F-spread, F2x cusp not found, Multiple candidates for F2x cusp, Multiple candidates for F2o cusp, One of F2 cusps was derived from the other, 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" >
2026.02.26 (057) 23:50:00</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">
FF202605702262350009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="25" >
<URSI ID="00" Val="9.350" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.850" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="26.652" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="2.850" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="2.850" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="9.700" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="355.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="355.000" 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="9.150" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="440.063" 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="3.550" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="3.550" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="386.676" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="353.345" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="6.964" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="50.641" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="12.361" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="25.593" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="59.670" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.070" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="1">
<Trace Type="standard" Layer="F2" Polarization="O" Num="131">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
2.85 2.9 2.95 3.0 3.05 3.1 3.15 3.2 3.25 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 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 9.35
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
390.000 387.500 385.000 380.000 377.727 375.455 373.182 370.909 368.636 366.364 364.091 361.818 359.545 357.273 355.000 355.000 356.667 358.333 360.000 361.875 363.750 365.625 367.500 369.375 371.250 373.125 375.000 375.000 380.000 377.500 375.000 372.500 370.000 370.405 370.811 371.216 371.622 372.027 372.432 372.838 373.243 373.649 374.054 374.459 374.865 375.270 375.676 376.081 376.486 376.892 377.297 377.703 378.108 378.514 378.919 379.324 379.730 380.135 380.541 380.946 381.351 381.757 382.162 382.568 382.973 383.378 383.784 384.189 400.000 400.000 398.750 397.500 396.250 395.000 400.000 400.000 400.000 400.000 401.000 402.000 403.000 404.000 405.000 400.000 395.000 390.000 385.000 385.000 385.000 385.000 385.000 385.000 385.000 385.000 385.000 385.000 385.000 390.000 390.000 395.000 395.000 400.000 400.000 401.667 403.333 405.000 406.667 408.333 410.000 417.500 425.000 430.000 430.000 430.000 427.500 425.000 427.500 430.000 430.475 431.023 431.663 432.421 433.332 434.447 435.845 437.648 440.063 443.462 448.604 457.290 475.115
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
51 0 57 60 0 0 60 57 0 0 0 0 0 0 60 63 0 0 57 0 57 48 0 54 0 54 60 60 63 0 60 0 54 0 0 54 0 51 0 0 0 0 0 51 54 0 0 0 0 0 0 54 60 0 0 0 0 0 0 0 0 57 0 0 0 0 0 0 51 51 54 0 0 54 54 0 54 54 0 0 54 0 54 51 57 0 57 0 0 0 0 0 0 51 0 57 54 54 57 57 57 51 57 54 54 54 0 54 54 57 54 48 51 51 0 48 0 51 0 0 51 48 51 0 0 0 0 51 51 45 45
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
0.390625 -2.734375 -0.390625 0.390625 1.171875 -0.390625 -1.953125 0.390625 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 -1.953125 0.390625 0.390625 0.390625 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 1.171875 -2.734375 1.171875 1.171875 0.390625 -0.390625 0.390625 1.171875 0.390625 -0.390625 -1.171875 1.953125 0.390625 1.171875 -0.390625 0.390625 0.390625 0.390625 1.171875 1.171875 -0.390625 0.390625 -0.390625 0.390625 1.171875 -0.390625 1.953125 -0.390625 1.953125 1.171875 -0.390625 1.171875 1.953125 1.953125 1.171875 1.171875 1.953125 -0.390625 0.390625 -0.390625 1.171875 1.171875 1.171875 0.390625 1.953125 1.171875 1.953125 0.390625 -2.734375 -0.390625 -2.734375 -2.734375 0.390625 -1.953125 1.171875 1.171875 0.390625 1.171875 0.390625 1.171875 1.171875 1.171875 1.171875 0.390625 1.953125 0.390625 1.171875 -0.390625 1.171875 1.171875 -1.953125 1.953125 1.171875 -1.953125 1.171875 -1.171875 1.171875 1.171875 1.171875 1.171875 2.734375 0.390625 1.953125 1.171875 0.390625 2.734375 0.390625 -2.734375 -0.390625 -1.171875 -1.953125 1.171875
</TraceValueList>
</Trace>
</TraceList>
<ProfileList Num="1">
<Profile  Algorithm="NH" AlgorithmVersion="4.33" Type="vertical" >
<Tabulated Num="135">
<AltitudeList Type="float" Units="km" Description="Altitude above station level" >
93.502 95.0 100.0 105.0 110.0 115.0 120.0 125.0 130.0 135.0 140.0 145.0 145.352 150.0 155.0 160.0 165.0 170.0 175.0 180.0 180.704 185.0 190.0 195.0 200.0 205.0 210.0 215.0 216.056 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 386.676 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0
</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 0.332 0.313 0.288 0.253 0.204 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.219 0.24 0.262 0.284 0.306 0.328 0.349 0.354 0.417 0.522 0.645 0.774 0.905 1.037 1.173 1.312 1.456 1.605 1.76 1.923 2.095 2.276 2.468 2.672 2.889 3.121 3.37 3.638 3.927 4.241 4.581 4.952 5.356 5.795 6.272 6.785 7.324 7.871 8.395 8.849 9.178 9.339 9.35 9.335 9.26 9.13 8.953 8.738 8.492 8.223 7.935 7.635 7.328 7.017 6.705 6.396 6.091 5.793 5.502 5.221 4.948 4.686 4.435 4.194 3.964 3.744 3.535 3.337 3.148 2.969 2.799 2.639 2.487 2.343 2.207 2.079 1.958 1.844 1.736 1.634 1.539 1.448 1.363 1.283 1.208 1.136 1.069 1.006 0.947 0.891 0.839 0.789 0.742 0.698 0.657 0.618 0.582 0.547 0.515 0.485 0.456 0.429 0.403 0.38 0.357 0.336 0.316 0.297 0.28 0.263 0.248 0.233 0.219 0.206

</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="9.35" PeakHeight="386.676" Num="5" zHalfNm="353.345" Error="3.95">
-143.404 -43.127 16.517 1.881 -2.487
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="106.056" Depth="0.154"/>
<TopsideChapman PeakHeight="386.676" PeakDensity="1084646.4" PeakScaleHeight="25.593" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
