<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-02-21 -052 22:40:00.000"
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, 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" >
2026.02.21 (052) 22:40:00</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">
FF202605202212240009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="25" >
<URSI ID="00" Val="8.100" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.626" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="21.268" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="3.050" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="3.050" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="8.700" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="380.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="380.000" 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="0.400" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="7.850" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="497.207" 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="3.350" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="3.350" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="430.760" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="375.638" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="7.616" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="81.962" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="14.894" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="42.135" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="89.470" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.380" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="1">
<Trace Type="standard" Layer="F2" Polarization="O" Num="102">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
415.000 410.000 405.000 395.000 392.500 390.000 380.000 390.000 435.000 435.000 440.000 435.000 435.000 435.000 435.000 435.000 435.000 435.000 435.000 435.000 435.000 435.000 435.000 435.000 435.000 435.000 435.000 435.000 430.000 420.000 415.000 395.000 394.286 393.571 392.857 392.143 391.429 390.714 390.000 389.286 388.571 387.857 387.143 386.429 385.714 385.000 390.000 395.000 400.000 400.000 400.000 410.000 415.000 420.000 430.000 433.333 436.667 440.000 443.333 446.667 450.000 453.333 456.667 460.000 460.000 455.000 450.000 447.500 445.000 443.889 442.778 441.667 440.556 439.444 438.333 437.222 436.111 435.000 440.000 450.000 450.000 450.000 455.000 456.063 457.238 458.543 460.000 461.639 463.495 465.614 468.057 470.905 474.267 478.296 483.212 489.344 497.207 507.656 522.217 543.909 579.675 649.781
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
51 51 51 51 0 0 51 51 54 48 51 51 0 51 48 0 0 0 0 0 0 0 0 0 0 0 0 51 48 57 51 54 0 0 0 54 0 0 0 0 0 0 54 48 0 48 54 54 51 0 51 51 54 57 54 0 0 0 0 0 0 0 0 54 48 0 57 0 54 60 0 60 54 60 60 0 0 60 66 69 63 63 66 69 0 0 63 63 60 66 0 63 60 60 57 63 66 57 51 0 0 0
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
0.390625 0.390625 0.390625 2.734375 -0.390625 -0.390625 0.390625 0.390625 0.390625 -1.171875 0.390625 -0.390625 1.171875 0.390625 1.171875 0.390625 0.390625 2.734375 -0.390625 0.390625 -0.390625 -2.734375 0.390625 1.171875 0.390625 0.390625 1.171875 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 2.734375 0.390625 1.171875 1.171875 -2.734375 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 1.171875 0.390625 1.171875 0.390625 1.171875 1.171875 1.953125 1.171875 0.390625 2.734375 1.171875 0.390625 0.390625 0.390625 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 -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 -0.390625
</TraceValueList>
</Trace>
</TraceList>
<ProfileList Num="1">
<Profile  Algorithm="NH" AlgorithmVersion="4.33" Type="vertical" >
<Tabulated Num="186">
<AltitudeList Type="float" Units="km" Description="Altitude above station level" >
93.502 95.0 100.0 105.0 110.0 115.0 120.0 125.0 130.0 135.0 140.0 142.563 145.0 150.0 155.0 160.0 165.0 170.0 175.0 175.126 180.0 185.0 190.0 195.0 200.0 205.0 207.689 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 430.76 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0
</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 0.274 0.23 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.223 0.247 0.27 0.294 0.318 0.341 0.354 0.371 0.417 0.475 0.548 0.634 0.728 0.827 0.931 1.036 1.144 1.255 1.369 1.486 1.607 1.733 1.863 1.998 2.139 2.286 2.441 2.603 2.773 2.951 3.14 3.339 3.549 3.771 4.006 4.254 4.516 4.791 5.079 5.378 5.688 6.003 6.319 6.63 6.929 7.207 7.459 7.675 7.852 7.983 8.066 8.099 8.1 8.092 8.064 8.016 7.951 7.87 7.775 7.668 7.549 7.421 7.285 7.142 6.993 6.839 6.681 6.521 6.359 6.195 6.031 5.867 5.704 5.541 5.38 5.221 5.064 4.91 4.758 4.609 4.463 4.32 4.18 4.044 3.911 3.781 3.655 3.532 3.413 3.297 3.184 3.075 2.969 2.866 2.766 2.67 2.577 2.486 2.399 2.314 2.233 2.153 2.077 2.003 1.932 1.863 1.796 1.732 1.67 1.61 1.552 1.497 1.443 1.391 1.341 1.292 1.246 1.201 1.157 1.116 1.075 1.036 0.999 0.963 0.928 0.894 0.862 0.831 0.8 0.771 0.743 0.716 0.69 0.665 0.641 0.618 0.595 0.574 0.553 0.533 0.513 0.495 0.477 0.459 0.443 0.427 0.411 0.396 0.382 0.368 0.355 0.342 0.329 0.317 0.306 0.295 0.284 0.274 0.264 0.254 0.245 0.236 0.227 0.219 0.211 0.203

</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="8.1" PeakHeight="430.76" Num="5" zHalfNm="375.638" Error="7.755">
-199.422 -34.699 12.483 2.056 -3.489
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="97.689" Depth="0.154"/>
<TopsideChapman PeakHeight="430.76" PeakDensity="814019.9" PeakScaleHeight="42.135" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
