id:"swepub:oai:DiVA.org:kth-319456"
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| Fältnamn | Indikatorer | Metadata |
|---|---|---|
| 000 | 03938naa a2200469 4500 | |
| 001 | oai:DiVA.org:kth-319456 | |
| 003 | SwePub | |
| 008 | 220930s2022 | |||||||||||000 ||eng| | |
| 009 | oai:DiVA.org:uu-486107 | |
| 024 | 7 | a https://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-3194562 URI |
| 024 | 7 | a https://doi.org/10.1029/2022JA0305352 DOI |
| 024 | 7 | a https://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-4861072 URI |
| 040 | a (SwePub)kthd (SwePub)uu | |
| 041 | a engb eng | |
| 042 | 9 SwePub | |
| 072 | 7 | a ref2 swepub-contenttype |
| 072 | 7 | a art2 swepub-publicationtype |
| 100 | 1 | a Odelstad, Eliasu Uppsala universitet,Institutet för rymdfysik, Uppsalaavdelningen4 aut0 (Swepub:uu)eliod143 |
| 245 | 1 0 | a Ion-Ion Cross-Field Instability of Lower Hybrid Waves in the Inner Coma of Comet 67P |
| 264 | 1 | b American Geophysical Union (AGU),c 2022 |
| 338 | a print2 rdacarrier | |
| 500 | a QC 20220930 | |
| 520 | a 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. | |
| 650 | 7 | a NATURVETENSKAPx Fysikx Astronomi, astrofysik och kosmologi0 (SwePub)103052 hsv//swe |
| 650 | 7 | a NATURAL SCIENCESx Physical Sciencesx Astronomy, Astrophysics and Cosmology0 (SwePub)103052 hsv//eng |
| 650 | 7 | a NATURVETENSKAPx Fysikx Fusion, plasma och rymdfysik0 (SwePub)103032 hsv//swe |
| 650 | 7 | a NATURAL SCIENCESx Physical Sciencesx Fusion, Plasma and Space Physics0 (SwePub)103032 hsv//eng |
| 653 | a lower hybrid waves | |
| 653 | a ion-ion cross-field instability | |
| 653 | a comets | |
| 653 | a plasma | |
| 653 | a pick-up ions | |
| 653 | a electric fields | |
| 700 | 1 | a Karlsson, Tomas,d 1964-u KTH,Rymd- och plasmafysik,KTH Royal Inst Technol, Stockholm, Sweden.4 aut0 (Swepub:kth)u154ti5p |
| 700 | 1 | a Eriksson, Andersu Uppsala universitet,Institutet för rymdfysik, Uppsalaavdelningen4 aut0 (Swepub:uu)andeerik |
| 700 | 1 | a Bergman, Sofiau Swedish Inst Space Phys, Kiruna, Sweden.4 aut |
| 700 | 1 | a Wieser, Gabriella Stenbergu Swedish Inst Space Phys, Kiruna, Sweden.4 aut |
| 710 | 2 | a Uppsala universitetb Institutet för rymdfysik, Uppsalaavdelningen4 org |
| 773 | 0 | t Journal of Geophysical Research - Space Physicsd : American Geophysical Union (AGU)g 127:9q 127:9x 2169-9380x 2169-9402 |
| 856 | 4 8 | u https://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-319456 |
| 856 | 4 8 | u https://doi.org/10.1029/2022JA030535 |
| 856 | 4 8 | u https://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-486107 |
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