<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-02-28 -059 17:10:00.000"
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="1 2 0 1 0 0 0 0 0 11 0 0 0 0 0 0 0 0 0 0 "/>
<Comments>AR.5002.44 Confidence: 95% PACIFIC flags: Multiple candidates for F2o cusp</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) 17:10:00</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">
FF202605902281710009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="33" >
<URSI ID="00" Val="13.275" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="10" Val="4.923" Name="foF1" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.557" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="33.887" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="2.200" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="4.350" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="81" Val="2.200" Name="fminE" Units="MHz" QL="/" DL="/" />
<URSI ID="20" Val="2.560" Name="foE" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="13.600" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="200.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="265.000" Name="h`F2" Units="km" QL="/" DL="/" />
<URSI ID="24" Val="96.567" Name="h`E" Units="km" QL="/" DL="/" />
<URSI ID="90" Val="94.436" Name="hmE" Units="km" QL="/" DL="/" />
<URSI ID="83" Val="4.355" Name="yE" Units="km" QL="/" DL="/" />
<URSI ID="86" Val="0.150" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="12.350" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="485.908" Name="h`(fMUF)" Units="km" QL="/" DL="/" />
<Custom Name="dlt foF2" Val="0.025" Description="Adjustment to the scaled foF2 during profile inversion" Units="MHz" />
<Modeled Name="foEp" Val="3.247" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="4.350" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="4.950" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<Modeled Name="foF1p" Val="4.293" Units="MHz" ModelName="IRI-90" />
<URSI ID="92" Val="380.273" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="91" Val="164.857" Name="hmF1" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="283.896" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="8.180" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="123.877" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="95" Val="53.274" Name="yF1" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="70.111" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="73.116" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="165.690" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.290" Name="B1" QL="/" DL="/" />
<URSI ID="D2" Val="0.180" Name="D1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="3">
<Trace Type="standard" Layer="F2" Polarization="O" Num="167">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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 10.55 10.6 10.65 10.7 10.75 10.8 10.85 10.9 10.95 11.0 11.05 11.1 11.15 11.2 11.25 11.3 11.35 11.4 11.45 11.5 11.55 11.6 11.65 11.7 11.75 11.8 11.85 11.9 11.95 12.0 12.05 12.1 12.15 12.2 12.25 12.3 12.35 12.4 12.45 12.5 12.55 12.6 12.65 12.7 12.75 12.8 12.85 12.9 12.95 13.0 13.05 13.1 13.15 13.2 13.25
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
265.000 270.000 272.917 275.833 278.750 281.667 284.583 287.500 290.417 293.333 296.250 299.167 302.083 305.000 305.000 307.500 310.000 310.000 310.000 315.000 315.000 316.250 317.500 318.750 320.000 325.000 325.000 325.000 325.000 325.000 330.000 330.000 330.000 335.000 335.000 335.000 335.000 340.000 340.000 340.000 340.000 340.000 341.667 343.333 345.000 346.667 348.333 350.000 350.000 350.000 355.000 355.000 360.000 360.000 360.000 360.000 360.000 365.000 365.000 365.000 370.000 370.000 370.000 370.000 370.000 375.000 377.500 380.000 382.500 385.000 385.000 385.000 385.000 387.500 390.000 391.667 393.333 395.000 395.000 395.000 395.000 397.500 400.000 402.500 405.000 405.000 405.833 406.667 407.500 408.333 409.167 410.000 410.000 415.000 415.000 415.000 415.000 420.000 420.000 420.000 420.000 420.000 420.000 425.000 430.000 430.000 430.000 430.000 430.000 430.000 430.000 430.000 430.000 430.000 435.000 435.000 435.000 437.500 440.000 441.667 443.333 445.000 445.000 445.000 445.000 445.000 450.000 450.000 450.000 450.000 452.500 455.000 457.500 460.000 460.000 462.500 465.000 465.000 465.000 465.000 467.500 470.000 470.000 472.500 475.000 477.500 480.113 482.908 485.908 489.133 492.612 496.375 500.458 504.904 509.764 515.099 520.980 527.498 534.761 542.904 552.099 562.562 574.577 588.515 604.878 624.360 647.946
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
48 48 0 0 0 0 48 0 0 0 0 0 0 48 48 0 51 54 54 57 60 0 0 0 60 54 57 54 57 54 57 57 57 57 60 60 60 60 0 60 57 51 0 57 0 0 0 60 57 51 60 60 57 60 63 66 66 66 69 69 66 45 0 0 66 69 60 66 0 51 57 0 63 51 60 0 0 57 60 0 66 0 63 0 57 63 0 0 0 0 0 63 57 60 0 60 54 60 60 57 60 0 54 60 48 0 0 54 57 57 57 0 0 54 54 0 60 0 54 0 0 45 51 54 54 54 48 0 0 57 0 54 0 54 54 0 51 51 51 51 48 51 48 0 0 54 0 54 0 54 54 0 48 48 48 48 42 42 45 48 48 42 0 0 0 0 0
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
-0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 0.390625 0.390625 0.390625 0.390625 2.734375 -0.390625 -0.390625 1.953125 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 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 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 -0.390625 0.390625 0.390625 0.390625 0.390625 -0.390625 -0.390625 -0.390625 0.390625 -0.390625 0.390625 0.390625 -1.953125 -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 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 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 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 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 0.390625 0.390625 0.390625 0.390625 -0.390625 0.390625 1.171875 2.734375 1.953125 1.171875
</TraceValueList>
</Trace>
<Trace Type="standard" Layer="F1" Polarization="O" Num="12">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
4.35 4.4 4.45 4.5 4.55 4.6 4.65 4.7 4.75 4.8 4.85 4.9
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
200.000 205.000 210.625 216.250 221.875 227.500 233.125 238.750 244.375 250.000 255.000 255.000
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
48 48 45 0 0 0 0 0 0 51 51 51
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
-0.390625 -0.390625 -0.390625 0.390625 -1.171875 -0.390625 -2.734375 -1.171875 -0.390625 -0.390625 0.390625 -0.390625
</TraceValueList>
</Trace>
<Trace Type="standard" Layer="E" Polarization="O" Num="8">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
2.2 2.25 2.3 2.35 2.4 2.45 2.5 2.55
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
96.567 96.974 97.408 97.871 98.366 98.899 99.474 100.099
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
54 51 0 0 0 0 0 48
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
-0.390625 -0.390625 1.953125 1.953125 -1.171875 1.953125 0.390625 -0.390625
</TraceValueList>
</Trace>
</TraceList>
<ProfileList Num="1">
<Profile  Algorithm="NH" AlgorithmVersion="4.33" Type="vertical" >
<Tabulated Num="189">
<AltitudeList Type="float" Units="km" Description="Altitude above station level" >
90.0 94.436 95.0 96.58 98.725 100.0 100.869 105.0 110.0 115.0 120.0 125.0 130.0 135.0 140.0 145.0 150.0 155.0 160.0 164.857 165.0 170.0 175.0 180.0 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 380.273 385.0 390.0 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 1000.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 2.56 2.553 2.464 2.464 2.521 2.56 2.77 3.015 3.265 3.509 3.734 3.935 4.117 4.283 4.439 4.587 4.728 4.857 4.923 4.927 5.055 5.187 5.324 5.466 5.612 5.763 5.919 6.081 6.248 6.42 6.598 6.782 6.971 7.167 7.368 7.576 7.789 8.009 8.234 8.466 8.702 8.944 9.191 9.443 9.698 9.957 10.218 10.481 10.744 11.007 11.267 11.523 11.773 12.014 12.244 12.46 12.657 12.833 12.985 13.107 13.198 13.255 13.275 13.275 13.27 13.253 13.225 13.186 13.137 13.079 13.012 12.937 12.853 12.762 12.664 12.56 12.45 12.334 12.213 12.088 11.958 11.825 11.688 11.547 11.405 11.259 11.112 10.963 10.812 10.66 10.507 10.353 10.198 10.043 9.888 9.733 9.579 9.424 9.27 9.117 8.964 8.813 8.662 8.513 8.364 8.217 8.072 7.927 7.785 7.643 7.504 7.366 7.23 7.095 6.962 6.831 6.702 6.575 6.449 6.325 6.203 6.083 5.965 5.849 5.735 5.622 5.511 5.402 5.295 5.19 5.087 4.985 4.885 4.787 4.691 4.597 4.504 4.413 4.323 4.235 4.149 4.065 3.982 3.9 3.82 3.742 3.665 3.59 3.516 3.444 3.373 3.303 3.235 3.168 3.102 3.038 2.975 2.913 2.853 2.793 2.735 2.678 2.622 2.568 2.514 2.462 2.41 2.36 2.311 2.262 2.215 2.169 2.123 2.079 2.035 1.993 1.951 1.91 1.87 1.831 1.792 1.754 1.718 1.681 1.646 1.611 1.578 1.544

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="3" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="2.56" PeakHeight="94.436" Num="3" Error="1.471">
-6.484 2.635 -0.587
</ShiftedChebyshev>
<ShiftedChebyshev Region="F1" StartFrequency="2.56" EndFrequency="4.923" PeakHeight="164.857" Num="5" Error="0.0">
-55.522 -13.618 7.481 -3.127 0.798
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="4.923" EndFrequency="13.275" PeakHeight="380.273" Num="5" zHalfNm="283.896" Error="5.942">
-174.764 -40.357 0.106 -0.486 0.085
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="6.433" Depth="0.096"/>
<TopsideChapman PeakHeight="380.273" PeakDensity="2186422.2" PeakScaleHeight="73.116" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
