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Magnetar-type bursting evolution of Jupiter global magnetoactivity since 1996
  • Mensur Omerbashich
Mensur Omerbashich
Journal of Geophysics

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The decade-scale evolution profile of short-burst pulses, observed previously in 4U 0142+61, emerges from mean spectra of mission-integrated Galileo–Cassini–Juno 1996-2020 annual orbiting samplings of Jupiter ⪅8nT global magnetic field. The profile is obtained by temporally mapping hyperlow-frequency (<1μHz) dynamics of the magnetospheric signature of solar wind’s Rieger-resonance perturbations in ~0.2–2 zeV, here used as a proxy of magnetoactivity. The 1–6 month (385.8–64.3 nHz) mechanical resonance of solar wind is impressed onto the Jovian magnetosphere entirely and encompassed the Rieger period PRg = 154 days and first six harmonics: 5/6 PRg, 2/3 PRg, 1/2 PRg, 1/3 PRg, 1/4 PRg, 1/5 PRg. Statistical fidelity of spectral peaks stayed well within a very high (Φ≫12) range, 10^7–10^5, reflecting the imprint’s completeness and incessantness. The magnetoactivity upsurge from the means that reach a high ~20% field variance began reformatting the signature around 1999, gradually transforming it into an anomalous state by 2002, also indicated from the anisotropic splitting of spectral peaks. In contrast, a comparison against 2005-2016 Cassini global samplings of Saturn revealed a calm Saturnian magnetoactivity, at a low ⪅1% field variance except for every ~7.3 yr when it is ⪅5% due to orbital-tidal forcing. Because the change in annual magnetoactivity is becoming more sinusoidal with time, resembling a magnetar bursts evolution profile, the Jupiter upsurge is the greatest possible. This conclusive confirmation of the ongoing Jupiter upsurge and its pulsar-type supports my earlier proposal that an increasing Jovian magnetoactivity facilitates seismicity on magnetically exposed Mars via magnetotail reconnecting. A global pulsation profile of magnetar type in a planet demands beacon orbiter missions to monitor Jupiter magnetoactivity permanently for deciphering the disruption capacity of possible Jovian magnetodipole-discharge jets to electrical grids and communication systems.