<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-02-21 -052 22:20:00.000"
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 0 0 0 0 0 0 0 0 1 0 "/>
<Comments>AR.5002.44 Confidence: 20% PACIFIC flags: F2o cusp not found, Multiple candidates for F2x cusp, Multiple candidates for F2o cusp, F2 cusps do not match, 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" >
2026.02.21 (052) 22:20:00</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">
FF202605202212220009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="24" >
<URSI ID="00" Val="10.500" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.307" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="24.221" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="3.400" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="3.400" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="6.050" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="340.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="340.000" 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="0.050" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="10.050" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="595.000" Name="h`(fMUF)" Units="km" QL="/" DL="/" />
<Modeled Name="foEp" Val="0.354" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="3.400" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="3.400" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="468.622" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="386.259" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="7.772" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="121.782" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="35.803" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="61.143" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="123.120" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.880" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="1">
<Trace Type="standard" Layer="F2" Polarization="O" Num="143">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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 9.4 9.45 9.5 9.55 9.6 9.65 9.7 9.75 9.8 9.85 9.9 9.95 10.0 10.05 10.1 10.15 10.2 10.25 10.3 10.35 10.4 10.45 10.5
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
340.000 340.833 341.667 342.500 343.333 344.167 345.000 360.000 360.000 360.000 360.000 360.000 360.000 360.000 360.000 360.000 360.000 360.000 360.000 360.000 365.000 365.000 366.154 367.308 368.462 369.615 370.769 371.923 373.077 374.231 375.385 376.538 377.692 378.846 380.000 380.000 382.500 385.000 385.000 385.000 387.500 390.000 390.000 380.000 395.000 395.000 395.000 392.500 390.000 387.500 385.000 390.000 400.000 400.000 400.000 410.000 410.000 410.000 412.500 415.000 407.500 400.000 420.000 422.500 425.000 425.000 425.000 430.000 430.000 430.000 430.000 435.000 435.000 437.500 440.000 440.000 445.000 446.250 447.500 448.750 450.000 450.000 455.000 460.000 460.000 460.000 460.000 470.000 470.000 470.000 470.000 470.000 475.000 475.000 480.000 485.000 485.000 490.000 490.000 490.000 495.000 500.000 500.000 505.000 505.000 515.000 515.000 520.000 525.000 520.000 525.000 530.000 530.000 535.000 535.000 540.000 545.000 547.500 550.000 550.000 555.000 560.000 565.000 570.000 570.000 572.500 575.000 577.500 580.000 582.500 585.000 590.000 595.000 595.000 600.000 605.000 610.000 615.000 620.000 625.000 630.000 640.000 645.000
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
66 0 0 0 0 0 0 51 51 0 0 0 48 0 0 66 63 72 63 63 60 60 0 0 0 0 0 60 0 54 0 0 0 0 54 57 0 51 60 63 0 57 57 60 48 57 60 0 66 0 57 66 66 66 60 57 57 63 54 66 63 66 60 48 54 54 51 54 60 0 60 63 54 57 66 66 63 0 0 0 69 69 66 60 60 57 66 48 51 0 60 66 66 66 72 63 69 66 69 66 69 69 69 69 57 54 57 54 60 63 51 57 60 66 66 69 69 63 69 66 0 66 66 66 63 0 66 0 0 0 51 54 51 54 51 48 0 48 45 0 45 48 51
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
0.390625 1.171875 0.390625 0.390625 0.390625 1.171875 0.390625 1.171875 0.390625 0.390625 1.171875 -2.734375 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 1.171875 0.390625 0.390625 1.171875 -2.734375 0.390625 0.390625 1.171875 1.171875 1.171875 0.390625 0.390625 0.390625 1.171875 0.390625 0.390625 1.171875 1.171875 0.390625 1.171875 0.390625 1.171875 1.171875 1.171875 1.171875 1.171875 1.171875 2.734375 1.171875 1.171875 0.390625 1.171875 1.171875 1.171875 1.171875 1.171875 0.390625 1.171875 1.171875 1.171875 1.171875 1.171875 1.171875 1.171875 1.171875 1.171875 -1.171875 1.171875 1.171875 1.171875 1.171875 1.171875 1.171875 1.171875 1.171875 1.171875 1.171875 1.171875 -2.734375 1.953125 1.171875 1.171875 1.171875 1.171875 1.171875 1.171875 1.171875 1.171875 1.171875 1.171875 1.171875 1.171875 1.171875 1.171875 1.171875 1.171875 1.171875 1.171875 1.171875 1.171875 1.171875 1.171875 1.171875 1.171875 1.171875 1.171875 1.171875 1.171875 1.171875 1.171875 1.171875 1.171875 1.171875 1.171875 1.171875 1.171875 1.171875 1.171875 1.171875 1.171875 0.390625 1.171875 1.171875 1.171875 -1.953125 2.734375 1.171875 1.171875 1.171875 1.171875 1.171875 1.171875 1.171875 1.171875 1.171875 1.171875 1.171875 1.171875 1.171875 1.171875 1.171875 1.171875 1.171875
</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 95.0 100.0 105.0 110.0 115.0 120.0 125.0 130.0 135.0 140.0 141.248 145.0 150.0 155.0 160.0 165.0 170.0 172.496 175.0 180.0 185.0 190.0 195.0 200.0 203.744 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 468.622 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 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 0.341 0.325 0.301 0.266 0.216 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.212 0.237 0.262 0.286 0.311 0.336 0.354 0.373 0.442 0.508 0.575 0.647 0.726 0.812 0.907 1.012 1.13 1.26 1.404 1.561 1.733 1.917 2.114 2.32 2.536 2.76 2.99 3.226 3.467 3.711 3.959 4.209 4.463 4.719 4.977 5.237 5.498 5.761 6.026 6.291 6.558 6.824 7.091 7.358 7.623 7.887 8.148 8.406 8.659 8.905 9.143 9.372 9.587 9.788 9.97 10.13 10.265 10.372 10.448 10.491 10.5 10.499 10.489 10.466 10.431 10.384 10.327 10.259 10.183 10.098 10.005 9.905 9.799 9.686 9.568 9.445 9.318 9.187 9.053 8.916 8.777 8.635 8.492 8.348 8.202 8.056 7.91 7.763 7.616 7.47 7.325 7.18 7.036 6.893 6.751 6.611 6.472 6.335 6.199 6.065 5.933 5.803 5.674 5.548 5.423 5.301 5.181 5.062 4.946 4.832 4.72 4.61 4.503 4.397 4.293 4.192 4.093 3.995 3.9 3.807 3.715 3.626 3.538 3.453 3.369 3.287 3.207 3.129 3.053 2.978 2.905 2.834 2.764 2.696 2.63 2.565 2.502 2.44 2.38 2.321 2.263 2.207 2.152 2.099 2.047 1.996 1.946 1.897 1.85 1.804 1.759 1.715 1.672 1.63 1.59 1.55 1.511 1.473 1.436 1.4 1.365 1.331 1.298 1.265 1.233 1.202 1.172 1.143

</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="10.5" PeakHeight="468.622" Num="5" zHalfNm="386.259" Error="7.439">
-263.247 -10.872 14.172 -8.924 3.993
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="93.744" Depth="0.154"/>
<TopsideChapman PeakHeight="468.622" PeakDensity="1367866.0" PeakScaleHeight="61.143" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
