Details

Autor(en) / Beteiligte

• Imai, Masafumi
• Kurth, William S.
• Hospodarsky, George B.
• Bolton, Scott J.
• Connerney, John E. P.
• Levin, Steven M.

Titel

Direction‐finding measurements of Jovian low‐frequency radio components by Juno near Perijove 1

Ist Teil von

• Geophysical research letters, 2017-07, Vol.44 (13), p.6508-6516

Ort / Verlag

Washington: John Wiley & Sons, Inc

Erscheinungsjahr

2017

Quelle

Wiley Online Library All Journals

Beschreibungen/Notizen

• With the aid of the radio and plasma wave (Waves) instrument on board the Juno spacecraft, the first scientific close encounter to Jupiter (Perijove 1) of Juno led to an opportunity to perform direction‐finding measurements of the intense Jovian broadband kilometric (bKOM) radiation at 10 to 142 kHz, two escaping continuum radiation (ECR) events at 9 to 22 kHz, and two narrowband kilometric (nKOM) radiation events at 45–112 kHz. We conclude that the northern bKOM radio sources are localized on M‐shell = 50–60 field lines where M‐shell is similar to L‐shell for nondipolar fields. The beam cone half‐angle varies from 40° to 55°. By intersecting the wave k vector with the Jovian centrifugal equator, two ECR sources are located inside and outside of 11–12 RJ, and two nKOM sources are found between 11 and 20 RJ. These source frequencies and locations can be used for plasma diagnostics in Jupiter's inner magnetosphere. Key Points We perform direction‐finding analysis for Jupiter's low‐frequency radio emissions Northern bKOM radio sources are located along high‐latitude auroral magnetic field lines Four smooth components provide a proxy of the electron density profiles in Jovian inner magnetosphere