LESIA Observatoire de Paris-PSL CNRS vopdc cdpp Sorbonne Université cnes Université de Paris

Juno/Waves estimated flux density Collection

Wednesday 27 October 2021, by Baptiste Cecconi, Corentin Louis, Philippe Zarka

This collection contains Juno/Waves processed datasets with the method described in Louis et al. (2021, doi: 10.1029/2021JA029435).

Link to data repository

How to display the data

To display this dataset easily, we recommend using the Autoplot software (Faden et al., 2010). Once the software is installed, just load the juno-waves-flux_density.vap file by doing `File>Open .vap file...’

Description

This datasets contain the Juno/Waves estimated flux density based on Cassini/RPWS measurements at Jupiter.

How are the flux density estimated?
The steps to derive the flux density are the following :

  • Use times series from PDS data in linear scale
  • Apply FFT filtering to remove interferences
  • Subtract a background (calculated from dB values) in linear scale
  • For LFR and HFR-High sub-receivers:
    • Correct for 1/R2 dependence
    • Select data intervals of 4 consecutive Jovian rotation with 15° < Latitudemagnetic < 15° and Distance > 30 RJ (same configuration than Cassini)
    • Build median 1% and 50% occurrence spectra and match with Cassini-RPWS and Voyager-PRA ones (Zarka 1992, Zarka et al. 2004) to derive a gain table between 3.5 kHz and 40.5 MHZ.
    • Extrapolate the gains down to 1 kHz
  • For the HFR-Low sub-receiver:
    • No 1/R2 dependence correction
    • Select data acquired during the ±2 hours around perijoves (when signal is observed by this sub-receiver)
    • Use the continuity of the signal between the LFR-High, HFR-Low and HFR-High sub-receiver to determine the HFR-Low gains.

Once the gains have been obtain, the steps to estimate the density flux are the following :

  • Use PDS data in linear scale, resample to 1 second
  • Apply an FFT-filtering by selecting the first eight harmonic of the spacecraft spin—period, with a width of δf=7% of the frequency around the peaks
  • Apply the gains of Table 1 (3rd row) which gives local-estimated flux densities
  • Optionally, correct for 1/R2 dependence to normalize the flux to a constant distance. This should not be done e.g. when studying local wave Electric-field, but should be done when studying the statistical latitudinal distribution of the radio beaming, as in the Louis et al. (2021) study.
  • Optionally subtract the time-independent background in linear scale of Table 1 (4th row)

A complete description of the methodology used to estimate the flux density can be found in Louis et al. (2021, submitted to JGR, doi).

List of Datasets

  • IDL save files
    • dataset at a temporal resolution of 1 second or 15 seconds containing the estimated flux density data with the intensity values in linear (ZLINCAL variable)
  • CDF files
    • dataset at a temporal resolution of 1 second, containing the estimated flux density data with the intensity values in linear (data variable), the gain, the background and the background standard deviation values.
  • Quicklook

Rules of use

  • We kindly request the authors of any communications and publications using these data to let us know about them, include minimal citation to the reference below and appropriate acknowledgements whenever needed.
  • References: Louis et al., 2021 (submitted to JGR, doi)
  • Acknowledgements: see the acknowledgement field

Link to the data at PDS

Acknowledgements
The MASER Juno/Waves CDR collection has been calculated by C. Louis, P. Zarka, K. Dabidin, P.-A. Lampson, F. Magalhaes, A. Boudouma, M. Marques and B. Cecconi. The authors acknowledge the Observatoire de Paris, CNES, CNRS for funding and supporting this work and B. Kurth and the University of Iowa and the Juno/Waves team for providing access to the Juno/Waves data accessible online from PDS at https://doi.org/10.17189/1519708. The authors thank J. Faden and C. Piker for their work on the Autoplot software.

Contact
Any question or request should be addressed to contact.maser@obspm.fr

Appendix

Table 1
LFR-Low
Waves channel Frequency (kHz) Gain Background (V2.m-2.Hz-1)
16 1.00100 666.59 1.761e-14
17 1.12300 666.59 1.182e-14
18 1.26950 666.59 9.001e-15
19 1.41600 666.59 8.984e-15
20 1.58690 666.59 4.692e-15
21 1.78220 666.59 3.276e-15
22 2.00200 666.59 2.204e-15
23 2.24610 666.59 1.535e-15
24 2.51470 666.59 1.060e-15
25 2.83200 666.59 7.794e-16
26 3.17380 666.59 5.505e-16
27 3.54000 666.59 4.130e-16
28 3.97950 666.59 3.072e-16
29 4.46780 666.59 2.548e-16
30 5.00490 666.59 2.089e-16
31 5.61520 764.43 1.836e-16
32 6.29880 795.81 1.625e-16
33 7.08010 779.93 1.458e-16
34 7.95900 712.70 1.310e-16
35 8.93550 604.70 1.120e-16
36 10.0100 539.08 1.160e-16
37 11.2300 502.31 1.126e-16
38 12.6220 445.65 1.094e-16
39 14.1600 373.30 1.037e-16
40 15.8690 304.05 9.698e-17
41 17.7980 239.54 1.016e-16
42 19.9710 200.98 1.165e-16
LFR-High
Waves channel Frequency (kHz) Gain Background (V2.m-2.Hz-1)
43 19.9580 375.13 3.675e-17
44 22.3390 357.63 3.520e-17
45 25.0850 334.44 3.381e-17
46 28.1980 319.79 3.259e-17
47 31.6770 290.99 3.159e-17
48 35.5220 258.77 3.067e-17
49 39.9170 235.64 2.860e-17
50 44.8610 209.35 2.766e-17
51 50.1710 184.94 2.789e-17
52 56.2130 163.79 2.830e-17
53 63.1710 146.09 2.834e-17
54 70.8620 132.19 2.804e-17
55 79.4680 121.48 2.765e-17
56 89.1720 125.29 2.948e-17
57 100.160 131.34 2.850e-17
58 112.430 124.92 2.731e-17
59 126.160 138.19 3.343e-17
60 141.540 169.76 3.791e-17
HFR-Low
Waves channel Frequency (kHz) Gain Background (V2.m-2.Hz-1)
61 140.140 169.76 2.617e-14
62 157.230 161.71 5.888e-14
63 177.730 154.05 4.424e-14
64 198.240 146.75 3.062e-14
65 222.170 139.79 6.993e-14
66 249.510 133.17 1.962e-14
67 280.270 126.85 4.308e-14
68 314.450 120.84 9.860e-15
69 352.050 115.11 1.031e-14
70 396.480 109.66 1.606e-14
71 447.750 104.46 1.461e-14
72 502.440 99.510 1.478e-14
73 563.960 94.793 2.654e-14
74 632.320 90.300 3.145e-14
75 707.520 86.020 2.517e-14
76 796.390 81.943 2.922e-14
77 895.510 78.060 3.516e-14
78 1001.50 74.360 4.271e-14
79 1121.10 70.835 8.534e-14
80 1261.20 67.478 6.657e-14
81 1415.00 64.280 2.537e-14
82 1585.90 61.233 3.051e-14
83 1780.80 58.331 2.383e-14
84 1999.50 55.566 2.424e-14
85 2242.20 52.933 5.176e-14
86 2515.60 50.424 2.815e-14
87 2823.20 48.034 1.479e-14
HFR-High
Waves channel Frequency (kHz) Gain Background (V2.m-2.Hz-1)
88 3500.00 45.757 1.588e-17
89 4500.00 54.413 1.491e-17
90 5500.00 31.990 2.985e-17
91 6500.00 47.236 2.720e-17
92 7500.00 162.44 9.192e-18
93 8500.00 123.56 1.933e-16
94 9500.00 159.62 1.601e-17
95 10500.0 153.26 2.614e-17
96 11500.0 161.59 6.300e-18
97 12500.0 95.258 1.326e-16
98 13500.0 158.32 1.963e-17
99 14500.0 267.19 1.155e-17
100 15500.0 73.323 4.687e-17
101 16500.0 86.143 1.679e-16
102 17500.0 271.19 1.013e-17
103 18500.0 231.91 1.731e-17
104 19500.0 72.625 1.170e-16
105 20500.0 4.5181 3.659e-15
106 21500.0 12.062 2.188e-15
107 22500.0 576.04 2.455e-17
108 23500.0 563.46 2.754e-17
109 24500.0 628.62 2.445e-17
110 25500.0 423.47 5.324e-17
111 26500.0 420.09 1.792e-17
112 27500.0 376.33 4.411e-17
113 28500.0 194.69 1.120e-16
114 29500.0 377.65 4.456e-17
115 30500.0 310.25 6.328e-17
116 31500.0 60.231 1.456e-16
117 32500.0 335.39 4.799e-17
118 33500.0 262.47 2.567e-17
119 34500.0 92.358 1.249e-16
120 35500.0 141.35 7.469e-17
121 36500.0 119.24 1.882e-17
122 37500.0 40.933 7.381e-17
123 38500.0 6.5991 2.727e-16
124 39500.0 0.88043 7.036e-16
125 40500.0 0.69274 4.855e-16

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