<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-02-27 -058 20:30:00.000"
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 1 0 0 0 0 0 11 0 0 0 0 0 0 0 0 1 0 "/>
<Comments>AR.5002.44 Confidence: 90% PACIFIC flags: One of F2 cusps was derived from the other</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) 20:30:00</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">
FF202605802272030009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="31" >
<URSI ID="00" Val="10.575" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="10" Val="4.673" Name="foF1" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.321" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="24.489" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="2.700" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="30" Val="3.600" Name="foEs" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="4.000" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="11.000" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="270.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="290.000" Name="h`F2" Units="km" QL="/" DL="/" />
<URSI ID="34" Val="105.000" Name="h`Es" 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="10.050" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="587.340" 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="1.937" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="4.000" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="4.850" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<URSI ID="92" Val="406.726" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="91" Val="211.542" Name="hmF1" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="282.648" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="8.366" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<Custom Name="fminEs" Val="2.700" Description="Minimum frequency of Es-layer" Units="MHz" />
<URSI ID="94" Val="148.109" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="95" Val="48.866" Name="yF1" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="51.340" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="85.699" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="181.410" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.650" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="3">
<Trace Type="standard" Layer="F2" Polarization="O" Num="118">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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 10.55
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
295.000 295.000 295.000 290.000 295.000 295.000 295.000 295.000 297.500 300.000 301.667 303.333 305.000 310.000 310.000 315.000 316.000 317.000 318.000 319.000 320.000 320.000 320.000 321.667 323.333 325.000 327.500 330.000 332.500 335.000 337.500 340.000 345.000 345.000 350.000 350.000 350.000 355.000 360.000 360.000 362.500 365.000 365.000 370.000 370.000 375.000 375.000 380.000 380.000 385.000 390.000 391.667 393.333 395.000 400.000 400.000 405.000 405.000 410.000 410.000 420.000 420.000 422.500 425.000 430.000 435.000 435.000 440.000 445.000 445.000 455.000 455.000 460.000 465.000 465.000 470.000 475.000 475.000 480.000 485.000 485.000 490.000 490.000 495.000 500.000 505.000 505.000 510.000 510.000 515.000 520.000 520.000 525.000 530.000 530.000 535.000 540.000 545.000 550.000 550.000 555.000 560.000 565.000 570.000 575.000 578.743 582.839 587.340 592.311 597.829 603.989 610.910 618.743 627.680 637.972 649.954 664.078 680.976
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
45 0 45 45 0 0 54 48 0 60 0 0 60 57 60 57 0 0 51 0 0 0 0 0 0 63 0 54 0 63 0 57 60 66 54 72 69 69 51 54 0 66 69 66 72 51 69 63 66 66 51 0 0 66 63 66 69 54 63 69 63 75 0 57 72 69 72 81 81 81 69 69 72 69 75 69 63 66 60 54 63 54 66 66 54 48 57 60 63 66 57 63 57 60 57 66 69 66 66 63 0 54 57 0 0 51 57 57 54 54 54 51 54 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 -1.171875 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -1.171875 -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 -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 -2.734375 -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 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -2.734375 -1.171875 -1.171875 -1.171875 -1.953125 -0.390625 -0.390625 -0.390625 -0.390625 -1.171875 -0.390625 -1.171875 -1.171875 -1.171875 -1.953125 -0.390625 1.171875 1.171875
</TraceValueList>
</Trace>
<Trace Type="standard" Layer="F1" Polarization="O" Num="14">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
270.000 270.000 271.250 272.500 273.750 275.000 275.000 277.500 280.000 280.000 283.333 286.667 290.000 292.500
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
48 45 0 0 0 51 51 0 57 57 0 0 48 0
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
-0.390625 -0.390625 1.171875 -0.390625 -0.390625 -0.390625 -0.390625 1.953125 -0.390625 -0.390625 -0.390625 -0.390625 0.390625 -0.390625
</TraceValueList>
</Trace>
<Trace Type="standard" Layer="Es" Polarization="O" Num="19">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
2.7 2.75 2.8 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
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
95.000 95.000 96.667 98.333 100.000 101.667 103.333 105.000 105.000 105.000 105.000 103.333 101.667 100.000 103.333 106.667 110.000 115.000 115.000
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
75 72 0 0 0 63 0 63 60 63 0 0 0 0 0 0 57 0 51
</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 -1.171875 -0.390625 -0.390625 -0.390625 -0.390625 0.390625 1.171875 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" >
89.779 90.0 95.0 100.0 105.0 110.0 115.0 118.564 120.0 125.0 127.128 130.0 135.0 135.692 140.0 145.0 150.0 155.0 160.0 165.0 170.0 175.0 180.0 185.0 190.0 195.0 200.0 205.0 210.0 211.542 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 395.0 400.0 405.0 406.726 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 1000.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 0.219 1.298 1.678 1.875 1.937 1.892 1.803 1.803 1.803 1.803 1.848 1.926 1.937 2.116 2.341 2.572 2.793 2.999 3.188 3.364 3.531 3.69 3.845 3.999 4.153 4.312 4.479 4.649 4.673 4.848 5.072 5.281 5.485 5.686 5.886 6.085 6.282 6.477 6.668 6.855 7.038 7.215 7.388 7.556 7.719 7.877 8.031 8.181 8.327 8.47 8.61 8.748 8.883 9.015 9.146 9.275 9.403 9.529 9.654 9.778 9.9 10.021 10.139 10.254 10.362 10.459 10.533 10.572 10.575 10.574 10.566 10.551 10.53 10.503 10.47 10.432 10.389 10.34 10.287 10.229 10.167 10.1 10.031 9.957 9.88 9.8 9.718 9.632 9.544 9.454 9.362 9.268 9.172 9.075 8.976 8.876 8.775 8.673 8.57 8.466 8.362 8.257 8.153 8.047 7.942 7.837 7.731 7.626 7.521 7.417 7.312 7.208 7.105 7.002 6.9 6.798 6.697 6.597 6.497 6.399 6.301 6.204 6.108 6.013 5.918 5.825 5.733 5.642 5.551 5.462 5.374 5.287 5.201 5.116 5.032 4.949 4.867 4.787 4.707 4.629 4.551 4.475 4.4 4.325 4.252 4.18 4.109 4.039 3.97 3.902 3.835 3.77 3.705 3.641 3.578 3.516 3.455 3.395 3.336 3.278 3.221 3.165 3.11 3.055 3.002 2.949 2.897 2.846 2.796 2.747 2.699 2.651 2.604 2.558 2.513 2.469 2.425 2.382 2.34 2.298 2.257 2.217 2.178 2.139 2.101 2.064 2.027 1.991

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="3" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="1.937" PeakHeight="110.0" Num="3" Error="0.0">
-28.968 10.983 -2.236
</ShiftedChebyshev>
<ShiftedChebyshev Region="F1" StartFrequency="1.937" EndFrequency="4.673" PeakHeight="211.542" Num="5" Error="0.0">
-60.572 -24.194 12.556 -4.237 0.597
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="4.673" EndFrequency="10.575" PeakHeight="406.726" Num="5" zHalfNm="282.648" Error="3.29">
-171.399 -41.857 24.543 -8.739 2.268
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="25.692" Depth="0.134"/>
<TopsideChapman PeakHeight="406.726" PeakDensity="1387476.8" PeakScaleHeight="85.699" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
