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Odelstad, E., Eriksson, A. I., Johansson, F. L., Vigren, E., Henri, P., Gilet, N., . . . André, M. (2018). Ion Velocity and Electron Temperature Inside and Around the Diamagnetic Cavity of Comet 67P. Journal of Geophysical Research - Space Physics, 123(7), 5870-5893
Open this publication in new window or tab >>Ion Velocity and Electron Temperature Inside and Around the Diamagnetic Cavity of Comet 67P
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2018 (English)In: Journal of Geophysical Research - Space Physics, ISSN 2169-9380, E-ISSN 2169-9402, Vol. 123, no 7, p. 5870-5893Article in journal (Refereed) Published
Abstract [en]

Abstract A major point of interest in cometary plasma physics has been the diamagnetic cavity, an unmagnetized region in the innermost part of the coma. Here we combine Langmuir and Mutual Impedance Probe measurements to investigate ion velocities and electron temperatures in the diamagnetic cavity of comet 67P, probed by the Rosetta spacecraft. We find ion velocities generally in the range 2?4 km/s, significantly above the expected neutral velocity 1 km/s, showing that the ions are (partially) decoupled from the neutrals, indicating that ion-neutral drag was not responsible for balancing the outside magnetic pressure. Observations of clear wake effects on one of the Langmuir probes showed that the ion flow was close to radial and supersonic, at least with respect to the perpendicular temperature, inside the cavity and possibly in the surrounding region as well. We observed spacecraft potentials  V throughout the cavity, showing that a population of warm (?5 eV) electrons was present throughout the parts of the cavity reached by Rosetta. Also, a population of cold ( ) electrons was consistently observed throughout the cavity, but less consistently in the surrounding region, suggesting that while Rosetta never entered a region of collisionally coupled electrons, such a region was possibly not far away during the cavity crossings.

Place, publisher, year, edition, pages
American Geophysical Union (AGU), 2018
Keywords
comets, Rosetta, plasma, diamagnetic cavity, ion velocity, electron temperature
National Category
Astronomy, Astrophysics and Cosmology
Research subject
Physics with specialization in Space and Plasma Physics
Identifiers
urn:nbn:se:kth:diva-273863 (URN)10.1029/2018JA025542 (DOI)000442664300043 ()2-s2.0-85050821184 (Scopus ID)
Funder
Swedish National Space Board, 109/12, 168/15, 166/14Swedish Research Council, 621-2013-4191
Note

Article published in Early View on 25 July, 2018 QC 20201202

Available from: 2020-06-01 Created: 2020-06-01 Last updated: 2024-01-18Bibliographically approved
Vigren, E., André, M., Edberg, N. J. T., Engelhardt, I. A. A., Eriksson, A., Galand, M., . . . Vallieres, X. (2017). Effective ion speeds at similar to 200-250 km from comet 67P/Churyumov-Gerasimenko near perihelion. Paper presented at International Conference on Cometary Science - Comets - A New Vision after Rosetta and Philae, NOV 14-18, 2016, Toulouse, France. Monthly notices of the Royal Astronomical Society, 469, S142-S148
Open this publication in new window or tab >>Effective ion speeds at similar to 200-250 km from comet 67P/Churyumov-Gerasimenko near perihelion
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2017 (English)In: Monthly notices of the Royal Astronomical Society, ISSN 0035-8711, E-ISSN 1365-2966, Vol. 469, p. S142-S148Article in journal (Refereed) Published
Abstract [en]

In 2015 August, comet 67P/Churyumov-Gerasimenko, the target comet of the ESA Rosetta mission, reached its perihelion at similar to 1.24 au. Here, we estimate for a three-day period near perihelion, effective ion speeds at distances similar to 200-250 km from the nucleus. We utilize two different methods combining measurements from the Rosetta Plasma Consortium (RPC)/Mutual Impedance Probe with measurements either from the RPC/Langmuir Probe or from the Rosetta Orbiter Spectrometer for Ion and Neutral Analysis (ROSINA)/Comet Pressure Sensor (COPS) (the latter method can only be applied to estimate the effective ion drift speed). The obtained ion speeds, typically in the range 2-8 km s(-1), are markedly higher than the expected neutral outflow velocity of similar to 1 km s(-1). This indicates that the ions were de-coupled from the neutrals before reaching the spacecraft location and that they had undergone acceleration along electric fields, not necessarily limited to acceleration along ambipolar electric fields in the radial direction. For the limited time period studied, we see indications that at increasing distances from the nucleus, the fraction of the ions' kinetic energy associated with radial drift motion is decreasing.

Keywords
molecular processes, comets: individual: 67P/Churyumov-Gerasimenko
National Category
Astronomy, Astrophysics and Cosmology Fusion, Plasma and Space Physics
Identifiers
urn:nbn:se:kth:diva-273867 (URN)10.1093/mnras/stx1472 (DOI)000443940500014 ()
Conference
International Conference on Cometary Science - Comets - A New Vision after Rosetta and Philae, NOV 14-18, 2016, Toulouse, France
Funder
Swedish Research Council, 621-2013-4191Swedish Research Council, 621-2014-5526Swedish National Space Board, 109/02Swedish National Space Board, 135/13Swedish National Space Board, 166/14Swedish National Space Board, 114/13
Note

QC 20201021

Available from: 2020-06-01 Created: 2020-06-01 Last updated: 2024-01-18Bibliographically approved
Fu, H. S., Vaivads, A., Khotyaintsev, Y. V., André, M., Cao, J. B., Olshevsky, V., . . . Retino, A. (2017). Intermittent energy dissipation by turbulent reconnection. Geophysical Research Letters, 44(1), 37-43
Open this publication in new window or tab >>Intermittent energy dissipation by turbulent reconnection
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2017 (English)In: Geophysical Research Letters, ISSN 0094-8276, E-ISSN 1944-8007, Vol. 44, no 1, p. 37-43Article in journal (Refereed) Published
Abstract [en]

Magnetic reconnectionthe process responsible for many explosive phenomena in both nature and laboratoryis efficient at dissipating magnetic energy into particle energy. To date, exactly how this dissipation happens remains unclear, owing to the scarcity of multipoint measurements of the diffusion region at the sub-ion scale. Here we report such a measurement by Clusterfour spacecraft with separation of 1/5 ion scale. We discover numerous current filaments and magnetic nulls inside the diffusion region of magnetic reconnection, with the strongest currents appearing at spiral nulls (O-lines) and the separatrices. Inside each current filament, kinetic-scale turbulence is significantly increased and the energy dissipation, Ej, is 100 times larger than the typical value. At the jet reversal point, where radial nulls (X-lines) are detected, the current, turbulence, and energy dissipations are surprisingly small. All these features clearly demonstrate that energy dissipation in magnetic reconnection occurs at O-lines but not X-lines.

Place, publisher, year, edition, pages
American Geophysical Union (AGU), 2017
Keywords
turbulent reconnection, energy dissipation, turbulence, magnetic nulls, current filaments, intermittence
National Category
Astronomy, Astrophysics and Cosmology
Identifiers
urn:nbn:se:kth:diva-253251 (URN)10.1002/2016GL071787 (DOI)000393954900005 ()2-s2.0-85010638265 (Scopus ID)
Funder
Swedish Research Council
Note

QC 20190625

Available from: 2019-06-14 Created: 2019-06-14 Last updated: 2022-06-26Bibliographically approved
Edberg, N. J. T., Alho, M., André, M., Andrews, D. J., Behar, E., Burch, J. L., . . . Volwerk, M. (2016). CME impact on comet 67P/Churyumov-Gerasimenko. Paper presented at 50th ESLAB Symposium, MAR 14-18, 2016, Leiden, NETHERLANDS. Monthly notices of the Royal Astronomical Society, 462, S45-S56
Open this publication in new window or tab >>CME impact on comet 67P/Churyumov-Gerasimenko
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2016 (English)In: Monthly notices of the Royal Astronomical Society, ISSN 0035-8711, E-ISSN 1365-2966, Vol. 462, p. S45-S56Article in journal (Refereed) Published
Abstract [en]

We present Rosetta observations from comet 67P/Churyumov-Gerasimenko during the impact of a coronal mass ejection (CME). The CME impacted on 2015 Oct 5-6, when Rosetta was about 800 km from the comet nucleus, and 1.4 au from the Sun. Upon impact, the plasma environment is compressed to the level that solar wind ions, not seen a few days earlier when at 1500 km, now reach Rosetta. In response to the compression, the flux of suprathermal electrons increases by a factor of 5-10 and the background magnetic field strength increases by a factor of similar to 2.5. The plasma density increases by a factor of 10 and reaches 600 cm(-3), due to increased particle impact ionization, charge exchange and the adiabatic compression of the plasma environment. We also observe unprecedentedly large magnetic field spikes at 800 km, reaching above 200 nT, which are interpreted as magnetic flux ropes. We suggest that these could possibly be formed by magnetic reconnection processes in the coma as the magnetic field across the CME changes polarity, or as a consequence of strong shears causing Kelvin-Helmholtz instabilities in the plasma flow. Due to the limited orbit of Rosetta, we are not able to observe if a tail disconnection occurs during the CME impact, which could be expected based on previous remote observations of other CME-comet interactions.

Keywords
Sun: coronal mass ejections (CMEs), solar wind, comets: individual: 67P/Churyumov-Gerasimenko
National Category
Fusion, Plasma and Space Physics
Identifiers
urn:nbn:se:kth:diva-273844 (URN)10.1093/mnras/stw2112 (DOI)000403172000006 ()2-s2.0-85015954646 (Scopus ID)
Conference
50th ESLAB Symposium, MAR 14-18, 2016, Leiden, NETHERLANDS
Funder
Swedish National Space Board, 109/12, 135/13, 166/14, 114/13Swedish Research Council, 621-2013-4191, 621-2014-5526
Note

QC 20200602

Available from: 2020-06-01 Created: 2020-06-01 Last updated: 2024-01-18Bibliographically approved
Graham, D. B., Khotyaintsev, Y. V., Vaivads, A. & Andre, M. (2016). Electrostatic solitary waves and electrostatic waves at the magnetopause. Journal of Geophysical Research - Space Physics, 121(4), 3069-3092
Open this publication in new window or tab >>Electrostatic solitary waves and electrostatic waves at the magnetopause
2016 (English)In: Journal of Geophysical Research - Space Physics, ISSN 2169-9380, E-ISSN 2169-9402, Vol. 121, no 4, p. 3069-3092Article in journal (Refereed) Published
Abstract [en]

Electrostatic solitary waves (ESWs) are characterized by localized bipolar electric fields parallel to the magnetic field and are frequently observed in space plasmas. In this paper a study of ESWs and field-aligned electrostatic waves, which do not exhibit localized bipolar fields, near the magnetopause is presented using the Cluster spacecraft. The speeds, length scales, field strengths, and potentials are calculated and compared with the local plasma conditions. A large range of speeds is observed, suggesting different generation mechanisms. In contrast, a smaller range of length scales normalized to the Debye length lambda(D) is found. For ESWs the average length between the positive and negative peak fields is 9 lambda(D), comparable to the average half wavelength of electrostatic waves. Statistically, the lengths and speeds of ESWs and electrostatic waves are shown to be similar. The length scales and potentials of the ESWs are consistent with predictions for stable electron holes. The maximum ESW potentials are shown to be constrained by the length scale and the magnetic field strength at the magnetopause and in the magnetosheath. The observed waves are consistent with those generated by the warm bistreaming instability, beam-plasma instability, and electron-ion instabilities, which account for the observed speeds and length scales. The large range of wave speeds suggests that the waves can couple different electron populations and electrons with ions, heating the plasma and contributing to anomalous resistivity.

National Category
Astronomy, Astrophysics and Cosmology
Identifiers
urn:nbn:se:kth:diva-253470 (URN)10.1002/2015JA021527 (DOI)000379960300018 ()
Funder
Swedish National Space Board, 128/11:2 77/13
Note

QC 20190624

Available from: 2019-06-15 Created: 2019-06-15 Last updated: 2022-06-26Bibliographically approved
Fu, H. S., Cao, J. B., Vaivads, A., Khotyaintsev, Y. V., Andre, M., Dunlop, M., . . . Eriksson, E. (2016). Identifying magnetic reconnection events using the FOTE method. Journal of Geophysical Research - Space Physics, 121(2), 1263-1272
Open this publication in new window or tab >>Identifying magnetic reconnection events using the FOTE method
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2016 (English)In: Journal of Geophysical Research - Space Physics, ISSN 2169-9380, E-ISSN 2169-9402, Vol. 121, no 2, p. 1263-1272Article in journal (Refereed) Published
Abstract [en]

A magnetic reconnection event detected by Cluster is analyzed using three methods: Single-spacecraft Inference based on Flow-reversal Sequence (SIFS), Multispacecraft Inference based on Timing a Structure (MITS), and the First-Order Taylor Expansion (FOTE). Using the SIFS method, we find that the reconnection structure is an X line; while using the MITS and FOTE methods, we find it is a magnetic island (O line). We compare the efficiency and accuracy of these three methods and find that the most efficient and accurate approach to identify a reconnection event is FOTE. In both the guide and nonguide field reconnection regimes, the FOTE method is equally applicable. This study for the first time demonstrates the capability of FOTE in identifying magnetic reconnection events; it would be useful to the forthcoming Magnetospheric Multiscale (MMS) mission. ion

Place, publisher, year, edition, pages
American Geophysical Union (AGU), 2016
Keywords
magnetic reconnection, MMS mission, FOTE method, magnetic null, X line, O line
National Category
Astronomy, Astrophysics and Cosmology
Identifiers
urn:nbn:se:kth:diva-253248 (URN)10.1002/2015JA021701 (DOI)000373002100023 ()2-s2.0-84975698091 (Scopus ID)
Available from: 2019-06-14 Created: 2019-06-14 Last updated: 2022-06-26Bibliographically approved
Li, W., Andre, M., Khotyaintsev, Y. V., Vaivads, A., Graham, D. B., Toledo-Redondo, S., . . . Strangeway, R. J. (2016). Kinetic evidence of magnetic reconnection due to Kelvin-Helmholtz waves. Geophysical Research Letters, 43(11), 5635-5643
Open this publication in new window or tab >>Kinetic evidence of magnetic reconnection due to Kelvin-Helmholtz waves
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2016 (English)In: Geophysical Research Letters, ISSN 0094-8276, E-ISSN 1944-8007, Vol. 43, no 11, p. 5635-5643Article in journal (Refereed) Published
Abstract [en]

The Kelvin-Helmholtz (KH) instability at the Earth's magnetopause is predominantly excited during northward interplanetary magnetic field (IMF). Magnetic reconnection due to KH waves has been suggested as one of the mechanisms to transfer solar wind plasma into the magnetosphere. We investigate KH waves observed at the magnetopause by the Magnetospheric Multiscale (MMS) mission; in particular, we study the trailing edges of KH waves with Alfvenic ion jets. We observe gradual mixing of magnetospheric and magnetosheath ions at the boundary layer. The magnetospheric electrons with energy up to 80keV are observed on the magnetosheath side of the jets, which indicates that they escape into the magnetosheath through reconnected magnetic field lines. At the same time, the low-energy (below 100eV) magnetosheath electrons enter the magnetosphere and are heated in the field-aligned direction at the high-density edge of the jets. Our observations provide unambiguous kinetic evidence for ongoing reconnection due to KH waves.

Place, publisher, year, edition, pages
Blackwell Publishing, 2016
Keywords
kinetic evidence, reconnection, Kelvin-Helmholtz wave
National Category
Astronomy, Astrophysics and Cosmology
Identifiers
urn:nbn:se:kth:diva-253541 (URN)10.1002/2016GL069192 (DOI)000379851800012 ()2-s2.0-84977100261 (Scopus ID)
Funder
Swedish National Space Board, 164/14, 176/15
Note

QC 20190625

Available from: 2019-06-15 Created: 2019-06-15 Last updated: 2022-06-26Bibliographically approved
Bale, S. D., Goetz, K., Harvey, P. R., Turin, P., Bonnell, J. W., Dudok de Wit, T., . . . Wygant, J. R. (2016). The FIELDS Instrument Suite for Solar Probe Plus. Space Science Reviews, 204(1-4), 49-82
Open this publication in new window or tab >>The FIELDS Instrument Suite for Solar Probe Plus
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2016 (English)In: Space Science Reviews, ISSN 0038-6308, E-ISSN 1572-9672, Vol. 204, no 1-4, p. 49-82Article, review/survey (Refereed) Published
Abstract [en]

NASA's Solar Probe Plus (SPP) mission will make the first in situ measurements of the solar corona and the birthplace of the solar wind. The FIELDS instrument suite on SPP will make direct measurements of electric and magnetic fields, the properties of in situ plasma waves, electron density and temperature profiles, and interplanetary radio emissions, amongst other things. Here, we describe the scientific objectives targeted by the SPP/FIELDS instrument, the instrument design itself, and the instrument concept of operations and planned data products.

Keywords
Coronal heating, Solar Probe Plus
National Category
Astronomy, Astrophysics and Cosmology
Identifiers
urn:nbn:se:kth:diva-253221 (URN)10.1007/s11214-016-0244-5 (DOI)000390050700003 ()29755144 (PubMedID)2-s2.0-84962167110 (Scopus ID)
Note

QC 20190624

Available from: 2019-06-14 Created: 2019-06-14 Last updated: 2022-06-26Bibliographically approved
Huang, S. Y., Fu, H. S., Vaivads, A., Yuan, Z. G., Pang, Y., Zhou, M., . . . Wang, D. D. (2015). Dawn-dusk scale of dipolarization front in the Earth's magnetotail: multi-cases study. Astrophysics and Space Science, 357(1), Article ID 22.
Open this publication in new window or tab >>Dawn-dusk scale of dipolarization front in the Earth's magnetotail: multi-cases study
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2015 (English)In: Astrophysics and Space Science, ISSN 0004-640X, E-ISSN 1572-946X, Vol. 357, no 1, article id 22Article in journal (Refereed) Published
Abstract [en]

We analyze three dipolarization front (DF) events to investigate their dawn-dusk scales in the Earth's magnetotail using the Cluster measurements in year 2007, when the spacecraft separation is about 1.8 Re (Re is the Earth's radius) and is appropriate for investigating the DF scale. Based on the Minimum Variance Analysis (MVA) and the general shape of the DF, we found that Cluster detected the center and the flank (or just beyond the flank) of DF in the same event. This means that the scale of DF is about 3.6 Re in the dawn-dusk direction, larger than that reported in previous studies. Using the semicircle function to fit the observations, we got the dawn-dusk scale of similar to 3.2-3.6 Re, consistent with the rough estimation. Considering large separation among the spacecraft, the timing analysis cannot be used to obtain the normal of DF and the propagation velocity along the normal. One should be careful when performing timing analysis of DF using the Cluster data, and have to carry on MVA analysis to check the normal of DF before do timing analysis.

Place, publisher, year, edition, pages
Kluwer Academic Publishers, 2015
Keywords
Magnetotail, Dipolarization front, Dawn-dusk scale, Timing analysis
National Category
Astronomy, Astrophysics and Cosmology
Identifiers
urn:nbn:se:kth:diva-253487 (URN)10.1007/s10509-015-2298-3 (DOI)000352850400022 ()2-s2.0-84928243422 (Scopus ID)
Note

QC 20190625

Available from: 2019-06-15 Created: 2019-06-15 Last updated: 2022-06-26Bibliographically approved
Graham, D. B., Khotyaintsev, Y. V., Vaivads, A. & André, M. (2015). Electrostatic solitary waves with distinct speeds associated with asymmetric reconnection. Geophysical Research Letters, 42(2), 215-224
Open this publication in new window or tab >>Electrostatic solitary waves with distinct speeds associated with asymmetric reconnection
2015 (English)In: Geophysical Research Letters, ISSN 0094-8276, E-ISSN 1944-8007, Vol. 42, no 2, p. 215-224Article in journal (Refereed) Published
Abstract [en]

Electrostatic solitary waves (ESWs) are observed at the magnetopause with distinct time scales. These ESWs are associated with asymmetric reconnection of the cold dense magnetosheath plasma with the hot tenuous magnetospheric plasma. The distinct time scales are shown to be due to ESWs moving at distinct speeds and having distinct length scales. The length scales are of order 5-50 Debye lengths, and the speeds range from approximate to 50 km s(-1) to approximate to 1000 km s(-1). The ESWs are observed near the reconnection separatrices. The observation of ESWs with distinct speeds suggests that multiple instabilities are occurring. The implications for reconnection at the magnetopause are discussed.

Keywords
electron solitary waves, magnetic reconnection, magnetopause
National Category
Physical Sciences
Identifiers
urn:nbn:se:kth:diva-253471 (URN)10.1002/2014GL062538 (DOI)000349956000005 ()
Note

QC 20190624

Available from: 2019-06-15 Created: 2019-06-15 Last updated: 2022-06-26Bibliographically approved
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ORCID iD: ORCID iD iconorcid.org/0000-0003-3725-4920

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