Ion-Ion Cross-Field Instability of Lower Hybrid Waves in the Inner Coma of Comet 67PShow others and affiliations
2022 (English)In: Journal of Geophysical Research - Space Physics, ISSN 2169-9380, E-ISSN 2169-9402, Vol. 127, no 9, article id e2022JA030535Article in journal (Refereed) Published
Abstract [en]
We show that an ion-ion cross-field streaming instability between cold newborn cometary ions and heated heavy ions that were picked up upstream is likely a contributing source of observed lower hybrid (LH) waves in the inner coma of comet 67P/Churyumov-Gerasimenko. Electric field oscillations in the LH frequency range are common here, and have previously been attributed mainly to the lower-hybrid drift instability, driven by gradients associated with observed local density fluctuations. However, the observed wave activity is not confined to such gradients, nor is it always strongest there. Thus, other instabilities are likely needed as well to explain the observed wave activity. Several previous works have shown the existence of multiple populations of cometary ions in the inner coma of 67P, distinguished by differences in mass, energy and/or flow direction. We here examine two selected time intervals in October and November 2015, with substantial wave activity in the LH frequency range, where we identify two distinct cometary ion populations: a bulk population of locally produced, predominantly radially outflowing ions, and a more tenuous population picked up further upstream and accelerated back toward the comet by the solar wind electric field. These two populations exhibit strong relative drifts (similar to 20 km/s, or about five times the pickup ion thermal velocity), and we perform an electrostatic dispersion analysis showing that conditions should be favorable for LH wave generation through the ion-ion cross-field instability.
Place, publisher, year, edition, pages
American Geophysical Union (AGU) , 2022. Vol. 127, no 9, article id e2022JA030535
Keywords [en]
lower hybrid waves, ion-ion cross-field instability, comets, plasma, pick-up ions, electric fields
National Category
Astronomy, Astrophysics and Cosmology
Identifiers
URN: urn:nbn:se:kth:diva-319456DOI: 10.1029/2022JA030535ISI: 000856055300001Scopus ID: 2-s2.0-85138749361OAI: oai:DiVA.org:kth-319456DiVA, id: diva2:1700275
Note
QC 20220930
2022-09-302022-09-302024-01-18Bibliographically approved