Ontology type: schema:ScholarlyArticle
2018-06-06
AUTHORSShannon Brown, Michael Janssen, Virgil Adumitroaie, Sushil Atreya, Scott Bolton, Samuel Gulkis, Andrew Ingersoll, Steven Levin, Cheng Li, Liming Li, Jonathan Lunine, Sidharth Misra, Glenn Orton, Paul Steffes, Fachreddin Tabataba-Vakili, Ivana Kolmašová, Masafumi Imai, Ondřej Santolík, William Kurth, George Hospodarsky, Donald Gurnett, John Connerney
ABSTRACTLightning has been detected on Jupiter by all visiting spacecraft through night-side optical imaging and whistler (lightning-generated radio waves) signatures1–6. Jovian lightning is thought to be generated in the mixed-phase (liquid–ice) region of convective water clouds through a charge-separation process between condensed liquid water and water-ice particles, similar to that of terrestrial (cloud-to-cloud) lightning7–9. Unlike terrestrial lightning, which emits broadly over the radio spectrum up to gigahertz frequencies10,11, lightning on Jupiter has been detected only at kilohertz frequencies, despite a search for signals in the megahertz range12. Strong ionospheric attenuation or a lightning discharge much slower than that on Earth have been suggested as possible explanations for this discrepancy13,14. Here we report observations of Jovian lightning sferics (broadband electromagnetic impulses) at 600 megahertz from the Microwave Radiometer15 onboard the Juno spacecraft. These detections imply that Jovian lightning discharges are not distinct from terrestrial lightning, as previously thought. In the first eight orbits of Juno, we detected 377 lightning sferics from pole to pole. We found lightning to be prevalent in the polar regions, absent near the equator, and most frequent in the northern hemisphere, at latitudes higher than 40 degrees north. Because the distribution of lightning is a proxy for moist convective activity, which is thought to be an important source of outward energy transport from the interior of the planet16,17, increased convection towards the poles could indicate an outward internal heat flux that is preferentially weighted towards the poles9,16,18. The distribution of moist convection is important for understanding the composition, general circulation and energy transport on Jupiter. More... »
PAGES87-90
http://scigraph.springernature.com/pub.10.1038/s41586-018-0156-5
DOIhttp://dx.doi.org/10.1038/s41586-018-0156-5
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PUBMEDhttps://www.ncbi.nlm.nih.gov/pubmed/29875484
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