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Energy budget and m...
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Toledo-Redondo, SergioESA ESAC, European Space Agcy, Madrid, Spain.
(author)
Energy budget and mechanisms of cold ion heating in asymmetric magnetic reconnection
- Article/chapterEnglish2017
Publisher, publication year, extent ...
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American Geophysical Union (AGU),2017
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printrdacarrier
Numbers
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LIBRIS-ID:oai:DiVA.org:kth-219469
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https://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-219469URI
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https://doi.org/10.1002/2017JA024553DOI
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https://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-340160URI
Supplementary language notes
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Language:English
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Summary in:English
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Subject category:ref swepub-contenttype
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Subject category:art swepub-publicationtype
Notes
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QC 20171206
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Cold ions (few tens of eV) of ionospheric origin are commonly observed on the magnetospheric side of the Earth's dayside magnetopause. As a result, they can participate in magnetic reconnection, changing locally the reconnection rate and being accelerated and heated. We present four events where cold ion heating was observed by the Magnetospheric Multiscale mission, associated with the magnetospheric Hall E field region of magnetic reconnection. For two of the events the cold ion density was small compared to the magnetosheath density, and the cold ions were heated roughly to the same temperature as magnetosheath ions inside the exhaust. On the other hand, for the other two events the cold ion density was comparable to the magnetosheath density and the cold ion heating observed was significantly smaller. Magnetic reconnection converts magnetic energy into particle energy, and ion heating is known to dominate the energy partition. We find that at least 10-25% of the energy spent by reconnection into ion heating went into magnetospheric cold ion heating. The total energy budget for cold ions may be even higher when properly accounting for the heavier species, namely helium and oxygen. Large E field fluctuations are observed in this cold ion heating region, i.e., gradients and waves, that are likely the source of particle energization. Plain Language Summary The magnetic field of Earth creates a natural shield that isolates and protects us from the particles and fields coming from our star, the Sun. This natural shield is called the magnetosphere and is filled by plasma. The particles coming from the Sun form another plasma called the solar wind and are usually deviated around the magnetosphere. However, under certain circumstances these two plasmas can reconnect (magnetic reconnection), and part of the energy and mass of the two plasmas is interchanged. Magnetic reconnection is the driver of storms and substorms inside the magnetosphere. In this work, we investigate what occurs to particles of very low energy (cold ions) of ionospheric origin when they reach the reconnecting boundary of the magnetosphere. It is found that they are energized and take an important part of the energy spent in reconnecting the plasmas. The plasma boundary develops spatial structures and emits waves that are able to heat the cold ions. Once heated, these cold ions irreversibly will escape the Earth's magnetosphere to never come back to Earth.
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André, MatsUppsala universitet,Institutet för rymdfysik, Uppsalaavdelningen(Swepub:uu)maand125
(author)
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Khotyaintsev, Yuri V.Uppsala universitet,Institutet för rymdfysik, Uppsalaavdelningen,Swedish Inst Space Phys, Uppsala, Sweden.(Swepub:uu)ykh28990
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Lavraud, BenoitUniv Toulouse, CNRS, Inst Rech Astrophys & Planetol, UPS, Toulouse, France.
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Vaivads, AndrisUppsala universitet,Institutet för rymdfysik, Uppsalaavdelningen(Swepub:uu)anvai517
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Graham, Daniel B.Uppsala universitet,Institutet för rymdfysik, Uppsalaavdelningen(Swepub:uu)dangr618
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Li, WenyaUppsala universitet,Institutet för rymdfysik, Uppsalaavdelningen(Swepub:uu)wenli806
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Perrone, DeniseESA ESAC, European Space Agcy, Madrid, Spain.
(author)
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Fuselier, StephenSouthwest Res Inst, San Antonio, TX USA.;Univ Texas San Antonio, Dept Phys & Astron, San Antonio, TX USA.
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Gershman, Daniel J.NASA, Goddard Space Flight Ctr, Greenbelt, MD USA.
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Aunai, NicolasUniv Paris Sud, UPMC Univ Paris 06, Lab Phys Plasmas, Ecole Polytech,CNRS,UMR7648,Observ Paris, Paris, France.
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Dargent, JeremyUniv Toulouse, CNRS, Inst Rech Astrophys & Planetol, UPS, Toulouse, France.;Univ Paris Sud, UPMC Univ Paris 06, Lab Phys Plasmas, Ecole Polytech,CNRS,UMR7648,Observ Paris, Paris, France.
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Giles, BarbaraNASA, Goddard Space Flight Ctr, Greenbelt, MD USA.
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Le Contel, OlivierUniv Paris Sud, UPMC Univ Paris 06, Lab Phys Plasmas, Ecole Polytech,CNRS,UMR7648,Observ Paris, Paris, France.
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Lindqvist, Per-ArneKTH,Rymd- och plasmafysik,Royal Inst Technol, Stockholm, Sweden.(Swepub:kth)u1yukyk9
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Ergun, Robert E.Univ Colorado, Atmospher & Space Phys Lab, Campus Box 392, Boulder, CO 80309 USA.
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Russell, Christopher T.Univ Calif Los Angeles, Earth Planetary & Space Sci, Los Angeles, CA USA.
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Burch, James L.Southwest Res Inst, San Antonio, TX USA.
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ESA ESAC, European Space Agcy, Madrid, Spain.Institutet för rymdfysik, Uppsalaavdelningen
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In:Journal of Geophysical Research - Space Physics: American Geophysical Union (AGU)122:9, s. 9396-94132169-93802169-9402
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