Steady magnetic field reconnection

Sonnerup, B. U. Ö.; Ip, J.T.C.; Phan, T. D.

doi:10.1029/gm058p0063

Cited by 71 publications

(108 citation statements)

References 37 publications

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“…1(m)) is consistent with the predicted quadrupolar Hall field ( Fig. 1(l)) (e.g., Sonnerup 1979), while the normal electric field E z pattern ( Fig. 1(n)), with E z < 0 for B x > 0 and E z > 0 for B x < 0, is consistent with the predicted converging Hall electric field structure ( Fig.…”

Section: Magnetotailsupporting

confidence: 75%

Establishing the Context for Reconnection Diffusion Region Encounters and Strategies for the Capture and Transmission of Diffusion Region Burst Data by MMS

et al. 2015

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This paper describes the efforts of our Inter-Disciplinary Scientist (IDS) team to (a) establish the large-scale context for reconnection diffusion region encounters by MMS at the magnetopause and in the magnetotail, including the distinction between X-line and O-line encounters, that would help the identification of diffusion regions in spacecraft data, and (b) devise possible strategies that can be used by MMS to capture and transmit burst data associated with diffusion region candidates. At the magnetopause we suggest the strategy of transmitting burst data from all magnetopause crossings so that no magnetopause reconnection diffusion regions encountered by the spacecraft will be missed. The strategy is made possible by the MMS mass memory and downlink budget. In the magnetotail, it is estimated that MMS will be able to transmit burst data for all diffusion regions, all reconnection jet fronts (a.k.a. dipolarization fronts) and separatrix encounters, but less than 50 % of reconnection exhausts encountered by the spacecraft. We also discuss automated burst trigger schemes that could capture various reconnection-related phenomena. The identification of candidate diffusion region encounters by the burst trigger schemes will be verified and improved by a Scientist-In-The-Loop (SITL). With the knowledge of the properties of the region surrounding the diffusion region and the combination of automated burst triggers and further optimization by the SITL, MMS should be able to capture most diffusion regions it encounters.

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Section: Magnetotailsupporting

confidence: 75%

Establishing the Context for Reconnection Diffusion Region Encounters and Strategies for the Capture and Transmission of Diffusion Region Burst Data by MMS

et al. 2015

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“…As well known, a Hall reconnection features the quadrupole out-ofplane magnetic field B y , which is generated by the Hall current circuit. 22 There is a narrow channel of E 0 y 6 ¼ 0 near the …”

Section: -7mentioning

confidence: 99%

“…The color indicates the polarity: B y > 0 in red and B y < 0 in blue. The projection of flipped field lines leads to a characteristic "quadrupole" pattern 22,23 in B y . In addition, as indicated in Figure 2, there are two "magnetic cavities" in the outflow region, where B y becomes weaker.…”

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confidence: 99%

The inner structure of collisionless magnetic reconnection: The electron-frame dissipation measure and Hall fields

et al. 2011

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It was recently proposed that the electron-frame dissipation measure, the energy transfer from the electromagnetic field to plasmas in the electron's rest frame, identifies the dissipation region of collisionless magnetic reconnection [Zenitani et al. Phys. Rev. Lett. 106, 195003 (2011)]. The measure is further applied to the electron-scale structures of antiparallel reconnection, by using two-dimensional particle-in-cell simulations.The size of the central dissipation region is controlled by the electron-ion mass ratio, suggesting that electron physics is essential. A narrow electron jet extends along the outflow direction until it reaches an electron shock. The jet region appears to be anti-dissipative. At the shock, electron heating is relevant to a magnetic cavity signature. The results are summarized to a unified picture of the single dissipation region in a Hall magnetic geometry.

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“…The bulk flow reversal from tailward to earthward was detected from 2329:00 to 2330:15 UT, and the magnetic field B z component (Figure 1c) reversed from negative to positive coincidently, which implies that the spacecraft moved from the tailward (v x < 0) to the earthward (v x > 0) side of an X line. Borg et al [2005] have analyzed the magnetic and electric field perturbations and found them to be consistent with Hall effects predicted by numerical simulations [Pritchett, 2001;Sonnerup, 1979]. All the foregoing evidence indicates that the Cluster was located in the diffusion region.…”

Section: Overview Of the Cluster Observationsmentioning

confidence: 66%

“…[4] In contrast, it is well known that the diffusion region exhibits two characteristic scales, the ion diffusion region and the electron diffusion region, owing to the decoupling of ion and electron motion [Sonnerup, 1979]. The decoupling of ions and electrons in the diffusion region results in Hall currents.…”

Section: Introductionmentioning

confidence: 99%

Wave properties in the magnetic reconnection diffusion region with high β: Application of the k‐filtering method to Cluster multispacecraft data

et al. 2010

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[1] Magnetic reconnection is a crucial physical process in laboratory and astrophysical plasmas. Plasma waves are believed to provide the dissipation mechanism in magnetic reconnection. In this paper we analyze the properties of low-frequency waves in a magnetotail reconnection diffusion region with a small guide field and high b. Using the k-filtering method on the magnetic field data measured by Cluster spacecraft, we found that low-frequency waves in the diffusion region were highly oblique propagating mode. We compared the measured dispersion relation with theoretical ones calculated using the linear (hot) two-fluid and Vlasov-Maxwell theory. It is found that the observed waves in the diffusion region (with high plasma b) follow the dispersion relation of the Alfvén-Whistler wave mode. Comparisons with previous simulations and observational results are also discussed.

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Steady magnetic field reconnection

Cited by 71 publications

References 37 publications

Establishing the Context for Reconnection Diffusion Region Encounters and Strategies for the Capture and Transmission of Diffusion Region Burst Data by MMS

Establishing the Context for Reconnection Diffusion Region Encounters and Strategies for the Capture and Transmission of Diffusion Region Burst Data by MMS

The inner structure of collisionless magnetic reconnection: The electron-frame dissipation measure and Hall fields

Wave properties in the magnetic reconnection diffusion region with high β: Application of the k‐filtering method to Cluster multispacecraft data

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