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J/A+A/604/A17  Jupiter decametric radio emissions over 26 years (Marques+, 2017)

Statistical analysis of 26 years of observations of decametric radio emissions from Jupiter. Marques M.S., Zarka P., Echer E., Ryabov V.B., Alves M.V., Denis L., Coffre A. <Astron. Astrophys. 604, A17 (2017)> =2017A&A...604A..17M (SIMBAD/NED BibCode)
ADC_Keywords: Solar system ; Planets ; Radio lines Keywords: radiation mechanisms: non-thermal - methods: statistical - catalogs - planets and satellites: aurorae - planets and satellites: individuals: Jupiter Abstract: Jupiter is a complex and at the same time very powerful radio source in the decameter wavelength range. The emission is anisotropic, intrinsically variable at millisecond to hour timescales, and also modulated by various external processes at much longer periods, ranging from ∼10h to months or years (including Jovian day and year, solar activity and solar wind variations, and for ground-based observations, terrestrial day and year). As a consequence, long-term observations and their statistical study have proved to be necessary for disentangling and understanding the observed phenomena. We have built a database from the available 26yr of systematic, daily observations conducted at the Nancay Decameter Array and recorded in digital format. This database contains all observed Jovian decametric emissions, classified with respect to the time-frequency morphology, their dominant circular polarization, and maximum frequency. We present the results of the first statistical analysis of this database. We confirm the earlier classification of Jovian decameter emissions in Io-A, -A', -B, -C, -D and non-Io-A, -B, -C types, but we also introduce new emission types (Io-A'' and Io-B') and precise and characterize the non-Io-D type. We determine the contours of all emission types in the CML-ΦIo plane (Central Meridian Longitude in Jupiter's System III coordinates versus Io Phase), provide representative examples of their typical time-frequency patterns, and the distribution of emission's maximum frequency as a function of {LAMBDA}Io (Io's Longitude). Finally, we present a statistical analysis of the distributions of the occurrence rate, duration, intensity and polarization for each emission type. non-Io-DAM appears to be related to small-scale, possibly bursty auroral structures. Description: We provide two files ('obs.dat' and 'em.dat') where the classification of decametric radio emission from Jupiter observed by Nancay Decametric Array during 26-years was done. The data is associated with the dynamic spectrums that you can access at https://www.obs-nancay.fr/ (Instruments/Decameter Array/Data availability/) File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file obs.dat 92 8163 Lists of the parameters of observation em.dat 721 11463 Lists of the numbers and parameters of emissions
See also: https://www.obs-nancay.fr : Nancay Obaervatory Home PAge Byte-by-byte Description of file: obs.dat
Bytes Format Units Label Explanations
3- 6 I4 --- RankObs [1/8163] 9- 18 A10 "date" Obs.date Observation date (YYYY/MM/DD) 21- 25 A5 "h:m" TimeTrans Jupiter's transit at Nancay meridian 28- 33 F6.2 deg DEdeg Jupiter's declination 36- 39 I4 min HAs Hour angle of start of observation 40 A1 --- --- [,] 41- 44 I4 min HAe Hour angle of end of observation 47- 48 I2 MHz Freq NDA optimisation frequency 51- 52 I2 --- Filt [1/4] Filter (1) 55- 59 A5 "h:m" Time Time of filter change 1->2 or 2->1 62- 69 A8 "h:m:s" Obs.timeS Start time of observation 72- 79 A8 "h:m:s" Obs.timeE End time of observation 82- 83 I2 MHz FreqMin Minimum - maximum frequency of observation 85 A1 --- --- [-] 87- 88 I2 MHz FreqMax Minimum - maximum frequency of observation 91- 92 I2 --- Nem [0/17] Number of emissions catalogued for this observation
Note (1): Filters as follows: 1 = 10-100MHz 2 = 20- 80MHz 3 = 10- 45MHz 4 = 16- 45MHz
Byte-by-byte Description of file: em.dat
Bytes Format Units Label Explanations
1- 6 I6 --- Rank [1/11463] 8- 9 I2 --- Pol [0/1] Polarization (0=LH,1=RH) 13- 17 A5 "h:m" TimeS Time of emission start 21- 25 A5 "h:m" TimeE Time of emission end 27- 33 F7.3 MHz FreqMin Minimum frequency of observation 35 A1 --- --- [-] 37- 43 F7.3 MHz FreqMax Maximum frequency of observation 46- 47 I2 --- Type [0/12] Source type (1) 48- 51 I4 --- AIP Average intensity in emission polygon (units of 0.3125 dB) 52- 55 I4 --- AIS Average intensity in symmetrical emission polygon in opposite polarization (units of 0.3125 dB) 56- 59 I4 % fracpt Fraction of points > background in dominant polarization 60- 63 I4 % PolC Circular polarization ratio (LH>0, RH<0) 64- 69 I6 --- RankObs [4/8162] Rank of corresponding observation 70- 73 I4 --- Npt Number of summits of emission polygon 78- 81 I4 --- Freq1 Frequency value of emission polygon summits (x30./400+10 = MHz) 82- 85 I4 --- Freq2 Frequency value of emission polygon summits (x30./400+10 = MHz) 86- 89 I4 --- Freq3 Frequency value of emission polygon summits (x30./400+10 = MHz) 90- 93 I4 --- Freq4 Frequency value of emission polygon summits (x30./400+10 = MHz) 94- 97 I4 --- Freq5 Frequency value of emission polygon summits (x30./400+10 = MHz) 98-101 I4 --- Freq6 Frequency value of emission polygon summits (x30./400+10 = MHz) 102-105 I4 --- Freq7 Frequency value of emission polygon summits (x30./400+10 = MHz) 106-109 I4 --- Freq8 Frequency value of emission polygon summits (x30./400+10 = MHz) 110-113 I4 --- Freq9 Frequency value of emission polygon summits (x30./400+10 = MHz) 114-117 I4 --- Freq10 Frequency value of emission polygon summits (x30./400+10 = MHz) 118-121 I4 --- Freq11 Frequency value of emission polygon summits (x30./400+10 = MHz) 122-125 I4 --- Freq12 Frequency value of emission polygon summits (x30./400+10 = MHz) 126-129 I4 --- Freq13 Frequency value of emission polygon summits (x30./400+10 = MHz) 130-133 I4 --- Freq14 Frequency value of emission polygon summits (x30./400+10 = MHz) 134-137 I4 --- Freq15 Frequency value of emission polygon summits (x30./400+10 = MHz) 138-141 I4 --- Freq16 Frequency value of emission polygon summits (x30./400+10 = MHz) 142-145 I4 --- Freq17 Frequency value of emission polygon summits (x30./400+10 = MHz) 146-149 I4 --- Freq18 Frequency value of emission polygon summits (x30./400+10 = MHz) 150-153 I4 --- Freq19 Frequency value of emission polygon summits (x30./400+10 = MHz) 154-157 I4 --- Freq20 Frequency value of emission polygon summits (x30./400+10 = MHz) 158-161 I4 --- Freq21 Frequency value of emission polygon summits (x30./400+10 = MHz) 162-165 I4 --- Freq22 Frequency value of emission polygon summits (x30./400+10 = MHz) 166-169 I4 --- Freq23 Frequency value of emission polygon summits (x30./400+10 = MHz) 170-173 I4 --- Freq24 Frequency value of emission polygon summits (x30./400+10 = MHz) 174-177 I4 --- Freq25 Frequency value of emission polygon summits (x30./400+10 = MHz) 178-181 I4 --- Freq26 Frequency value of emission polygon summits (x30./400+10 = MHz) 182-185 I4 --- Freq27 Frequency value of emission polygon summits (x30./400+10 = MHz) 186-189 I4 --- Freq28 Frequency value of emission polygon summits (x30./400+10 = MHz) 190-193 I4 --- Freq29 Frequency value of emission polygon summits (x30./400+10 = MHz) 194-197 I4 --- Freq30 Frequency value of emission polygon summits (x30./400+10 = MHz) 198-201 I4 --- Freq31 Frequency value of emission polygon summits (x30./400+10 = MHz) 202-205 I4 --- Freq32 Frequency value of emission polygon summits (x30./400+10 = MHz) 206-209 I4 --- Freq33 Frequency value of emission polygon summits (x30./400+10 = MHz) 210-213 I4 --- Freq34 Frequency value of emission polygon summits (x30./400+10 = MHz) 214-217 I4 --- Freq35 Frequency value of emission polygon summits (x30./400+10 = MHz) 218-221 I4 --- Freq36 Frequency value of emission polygon summits (x30./400+10 = MHz) 222-225 I4 --- Freq37 Frequency value of emission polygon summits (x30./400+10 = MHz) 226-229 I4 --- Freq38 Frequency value of emission polygon summits (x30./400+10 = MHz) 230-233 I4 --- Freq39 Frequency value of emission polygon summits (x30./400+10 = MHz) 234-237 I4 --- Freq40 Frequency value of emission polygon summits (x30./400+10 = MHz) 238-241 I4 --- Freq41 Frequency value of emission polygon summits (x30./400+10 = MHz) 242-245 I4 --- Freq42 Frequency value of emission polygon summits (x30./400+10 = MHz) 246-249 I4 --- Freq43 Frequency value of emission polygon summits (x30./400+10 = MHz) 250-253 I4 --- Freq44 Frequency value of emission polygon summits (x30./400+10 = MHz) 254-257 I4 --- Freq45 Frequency value of emission polygon summits (x30./400+10 = MHz) 258-261 I4 --- Freq46 Frequency value of emission polygon summits (x30./400+10 = MHz) 262-265 I4 --- Freq47 Frequency value of emission polygon summits (x30./400+10 = MHz) 266-269 I4 --- Freq48 Frequency value of emission polygon summits (x30./400+10 = MHz) 270-273 I4 --- Freq49 Frequency value of emission polygon summits (x30./400+10 = MHz) 274-277 I4 --- Freq50 Frequency value of emission polygon summits (x30./400+10 = MHz) 278-281 I4 --- Freq51 Frequency value of emission polygon summits (x30./400+10 = MHz) 282-285 I4 --- Freq52 Frequency value of emission polygon summits (x30./400+10 = MHz) 286-289 I4 --- Freq53 Frequency value of emission polygon summits (x30./400+10 = MHz) 290-293 I4 --- Freq54 Frequency value of emission polygon summits (x30./400+10 = MHz) 294-297 I4 --- Freq55 Frequency value of emission polygon summits (x30./400+10 = MHz) 298-301 I4 --- Freq56 Frequency value of emission polygon summits (x30./400+10 = MHz) 302-305 I4 --- Freq57 Frequency value of emission polygon summits (x30./400+10 = MHz) 306-309 I4 --- Freq58 Frequency value of emission polygon summits (x30./400+10 = MHz) 310-313 I4 --- Freq59 Frequency value of emission polygon summits (x30./400+10 = MHz) 314-317 I4 --- Freq60 Frequency value of emission polygon summits (x30./400+10 = MHz) 318-321 I4 --- Freq61 Frequency value of emission polygon summits (x30./400+10 = MHz) 322-325 I4 --- Freq62 [0] Frequency value of emission polygon summits (x30./400+10 = MHz) 326-329 I4 --- Freq63 [0] Frequency value of emission polygon summits (x30./400+10 = MHz) 330-333 I4 --- Freq64 [0] Frequency value of emission polygon summits (x30./400+10 = MHz) 338-343 I6 --- Time1 Freq1 time value of emission polygon summits (2) 344-349 I6 --- Time2 Freq2 time value of emission polygon summits (2) 350-355 I6 --- Time3 Freq3 time value of emission polygon summits (2) 356-361 I6 --- Time4 Freq4 time value of emission polygon summits (2) 362-367 I6 --- Time5 Freq5 time value of emission polygon summits (2) 368-373 I6 --- Time6 Freq6 time value of emission polygon summits (2) 374-379 I6 --- Time7 Freq7 time value of emission polygon summits (2) 380-385 I6 --- Time8 Freq8 time value of emission polygon summits (2) 386-391 I6 --- Time9 Freq9 time value of emission polygon summits (2) 392-397 I6 --- Time10 Freq10 time value of emission polygon summits (2) 398-403 I6 --- Time11 Freq11 time value of emission polygon summits (2) 404-409 I6 --- Time12 Freq12 time value of emission polygon summits (2) 410-415 I6 --- Time13 Freq13 time value of emission polygon summits (2) 416-421 I6 --- Time14 Freq14 time value of emission polygon summits (2) 422-427 I6 --- Time15 Freq15 time value of emission polygon summits (2) 428-433 I6 --- Time16 Freq16 time value of emission polygon summits (2) 434-439 I6 --- Time17 Freq17 time value of emission polygon summits (2) 440-445 I6 --- Time18 Freq18 time value of emission polygon summits (2) 446-451 I6 --- Time19 Freq19 time value of emission polygon summits (2) 452-457 I6 --- Time20 Freq20 time value of emission polygon summits (2) 458-463 I6 --- Time21 Freq21 time value of emission polygon summits (2) 464-469 I6 --- Time22 Freq22 time value of emission polygon summits (2) 470-475 I6 --- Time23 Freq23 time value of emission polygon summits (2) 476-481 I6 --- Time24 Freq24 time value of emission polygon summits (2) 482-487 I6 --- Time25 Freq25 time value of emission polygon summits (2) 488-493 I6 --- Time26 Freq26 time value of emission polygon summits (2) 494-499 I6 --- Time27 Freq27 time value of emission polygon summits (2) 500-505 I6 --- Time28 Freq28 time value of emission polygon summits (2) 506-511 I6 --- Time29 Freq29 time value of emission polygon summits (2) 512-517 I6 --- Time30 Freq30 time value of emission polygon summits (2) 518-523 I6 --- Time31 Freq31 time value of emission polygon summits (2) 524-529 I6 --- Time32 Freq32 time value of emission polygon summits (2) 530-535 I6 --- Time33 Freq33 time value of emission polygon summits (2) 536-541 I6 --- Time34 Freq34 time value of emission polygon summits (2) 542-547 I6 --- Time35 Freq35 time value of emission polygon summits (2) 548-553 I6 --- Time36 Freq36 time value of emission polygon summits (2) 554-559 I6 --- Time37 Freq37 time value of emission polygon summits (2) 560-565 I6 --- Time38 Freq38 time value of emission polygon summits (2) 566-571 I6 --- Time39 Freq39 time value of emission polygon summits (2) 572-577 I6 --- Time40 Freq40 time value of emission polygon summits (2) 578-583 I6 --- Time41 Freq41 time value of emission polygon summits (2) 584-589 I6 --- Time42 Freq42 time value of emission polygon summits (2) 590-595 I6 --- Time43 Freq43 time value of emission polygon summits (2) 596-601 I6 --- Time44 Freq44 time value of emission polygon summits (2) 602-607 I6 --- Time45 Freq45 time value of emission polygon summits (2) 608-613 I6 --- Time46 Freq46 time value of emission polygon summits (2) 614-619 I6 --- Time47 Freq47 time value of emission polygon summits (2) 620-625 I6 --- Time48 Freq48 time value of emission polygon summits (2) 626-631 I6 --- Time49 Freq49 time value of emission polygon summits (2) 632-637 I6 --- Time50 Freq50 time value of emission polygon summits (2) 638-643 I6 --- Time51 Freq51 time value of emission polygon summits (2) 644-649 I6 --- Time52 Freq52 time value of emission polygon summits (2) 650-655 I6 --- Time53 Freq53 time value of emission polygon summits (2) 656-661 I6 --- Time54 Freq54 time value of emission polygon summits (2) 662-667 I6 --- Time55 Freq55 time value of emission polygon summits (2) 668-673 I6 --- Time56 Freq56 time value of emission polygon summits (2) 674-679 I6 --- Time57 Freq57 time value of emission polygon summits (2) 680-685 I6 --- Time58 Freq58 time value of emission polygon summits (2) 686-691 I6 --- Time59 Freq59 time value of emission polygon summits (2) 692-697 I6 --- Time60 Freq60 time value of emission polygon summits (2) 698-703 I6 --- Time61 Freq61 time value of emission polygon summits (2) 704-709 I6 --- Time62 [0] Freq62 time value of emission polygon summits (2) 710-715 I6 --- Time63 [0] Freq63 time value of emission polygon summits (2) 716-721 I6 --- Time64 [0] Freq64 time value of emission polygon summits (2)
Note (1): Source type as follows: 0 = Io-A 1 = Io-B 2 = Io-A' 3 = Io-A'' 4 = Io-C 5 = Io-D 6 = non-Io-A 7 = non-Io-B 9 = non-Io-C 10 = non-Io-D 11 = undefined 12 = Io-B' Note (2): spectrum rank in file ∼ second since file start.
Acknowledgements: Manilo Soares Marques, manilo.marques(at)gmail.com
(End) Patricia Vannier [CDS] 17-May-2017
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