Oxygen ion response to proton bursty bulk flows

Nilsson, Hans (author): Luleå tekniska universitet,Rymdteknik,Swedish Inst Space Phys, Kiruna, Sweden.;Lulea Univ Technol, Div Space Technol, Kiruna, Sweden.

Hamrin, Maria (author): Umeå universitet,Institutionen för fysik,Department of Physics, Umeå University,Umea Univ, Dept Phys, Umea, Sweden.

Pitkänen, Timo (author): Umeå universitet,Institutionen för fysik,Department of Physics, Umeå University,Umea Univ, Dept Phys, Umea, Sweden.

Karlsson, Tomas (author): KTH,Rymd- och plasmafysik,Space and Plasma Physics, School of Electrical Engineering Royal Institute of Technology Stockholm,Royal Inst Technol, Sch Elect Engn, Space & Plasma Phys, Stockholm, Sweden.

Slapak, Rikard (author): Luleå tekniska universitet,Rymdteknik,Lulea Univ Technol, Div Space Technol, Kiruna, Sweden.

Andersson, Laila O. (author): Laboratory for Atmospheric and Space Physics, University of Colorado, Boulder, Colorado,Lab Atmospher & Space Phys, Boulder, CO USA.

Gunell, Herbert (author): Swedish Institute of Space Physics / Institutet för rymdfysik , Belgian Institute for Space Aeronomy, Brussels,Royal Belgian Inst Space Aeron, Brussels, Belgium.

Schillings, Audrey (author): Luleå tekniska universitet,Rymdteknik,Swedish Inst Space Phys, Kiruna, Sweden.;Lulea Univ Technol, Div Space Technol, Kiruna, Sweden.

Vaivads, Andris (author): Uppsala universitet,Institutet för rymdfysik, Uppsalaavdelningen

(creator_code:org_t)

American Geophysical Union (AGU), 2016
2016
English.
In: Journal of Geophysical Research - Space Physics. - : American Geophysical Union (AGU). - 2169-9380 .- 2169-9402. ; 121:8, s. 7535-7546

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Abstract Subject headings

We have used Cluster spacecraft data from the years 2001 to 2005 to study how oxygen ions respond to bursty bulk flows (BBFs) as identified from proton data. We here define bursty bulk flows as periods of proton perpendicular velocities more than 100 km/s and a peak perpendicular velocity in the structure of more than 200 km/s, observed in a region with plasma beta above 1 in the near-Earth central tail region. We find that during proton BBFs only a minor increase in the O+ velocity is seen. The different behavior of the two ion species is further shown by statistics of H+ and O+ flow also outside BBFs: For perpendicular earthward velocities of H+ above about 100 km/s, the O+ perpendicular velocity is consistently lower, most commonly being a few tens of kilometers per second earthward. In summary, O+ ions in the plasma sheet experience less acceleration than H+ ions and are not fully frozen in to the magnetic field. Therefore, H+ and O+ motion is decoupled, and O+ ions have a slower earthward motion. This is particularly clear during BBFs. This may add further to the increased relative abundance of O+ ions in the plasma sheet during magnetic storms. The data indicate that O+ is typically less accelerated in association with plasma sheet X lines as compared to H+.

By the author/editor: Nilsson, Hans; Hamrin, Maria; Pitkänen, Timo; Karlsson, Tomas; Slapak, Rikard; Andersson, Laila ...; show more...; Gunell, Herbert; Schillings, Audr ...; Vaivads, Andris; show less...

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By the university: Luleå University of Technology; Umeå University; Royal Institute of Technology; Uppsala University

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