On the large-scale structure of the tail current as measured by THEMIS

Калегаев, В. В.; Alexeev, I. I.; Nazarkov, Ilya; Angelopoulos, V.

doi:10.1016/j.asr.2014.07.019

Cited by 3 publications

(3 citation statements)

References 30 publications

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“…This local minimum in δB Z indicates that the inner edge of the CS is located at ~ −1.22 R M . At Earth, the inner edge of the CS is located at

X_{normalG normalS normalM}^{'}

~ 10–12 R E during quiet intervals and shifts earthward to ~ 6–7 R E during active times [ Wang et al ., ; Kalegaev et al ., ]. Using the scaling factor of ~ 8, the quiet time location of the inner edge of Mercury's CS based on the Earth value would be ~ 1.25 R M , which agrees well our MESSENGER results.…”

Section: Discussion and Summarysupporting

confidence: 86%

Mercury's cross‐tail current sheet: Structure, X‐line location and stress balance

Poh

Slavin

Jia

et al. 2017

Geophysical Research Letters

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The structure, X‐line location, and magnetohydrodynamic (MHD) stress balance of Mercury's magnetotail were examined between −2.6 < XMSM < −1.4 RM using MErcury Surface, Space ENvironment, GEochemistry, and Ranging (MESSENGER) measurements from 319 central plasma sheet (CPS) crossings. The mean plasma β in the CPS calculated from MESSENGER data is ~ 6. The CPS magnetic field was southward (i.e., tailward of X‐line) ~ 2–18% of the time. Extrapolation of downtail variations in BZ indicates an average X‐line location at −3 RM. Modeling of magnetic field measurements produced a cross‐tail current sheet (CS) thickness, current density, and inner CS edge location of 0.39 RM, 92 nA/m2 and −1.22 RM, respectively. Application of MHD stress balance suggests that heavy planetary ions may be important in maintaining stress balance within Mercury's CPS. Qualitative similarities between Mercury's and Earth's magnetotail are remarkable given the differences in upstream conditions, internal plasma composition, finite gyro‐radius scaling, and Mercury's lack of ionosphere.

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“…This local minimum in δB Z indicates that the inner edge of the CS is located at ~ −1.22 R M . At Earth, the inner edge of the CS is located at

X_{normalG normalS normalM}^{'}

Section: Discussion and Summarysupporting

confidence: 86%

Mercury's cross‐tail current sheet: Structure, X‐line location and stress balance

Poh

Slavin

Jia

et al. 2017

Geophysical Research Letters

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“…The transfer of energy into the magnetosphere is less for cycle 23 than in cycle 24. As solar cycle 23 has undergone a long solar minimum, the background interplanetary condition in the cycle 24 has been low [ Kalegaev et al ., ] similar to the weak heliospheric conditions. As a result, the rate of magnetopsheric energy transfer and response of their current system is less for cycle 24 than the typical response in cycle 23 with the same interplanetary input.…”

Section: Discussionmentioning

confidence: 74%

Section: Discussionmentioning

confidence: 91%

On the reduced geoeffectiveness of solar cycle 24: A moderate storm perspective

et al. 2016

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The moderate and intense geomagnetic storms are identified for the first 77 months of solar cycles 23 and 24. The solar sources responsible for the moderate geomagnetic storms are indentified during the same epoch for both the cycles. Solar cycle 24 has shown nearly 80% reduction in the occurrence of intense storms whereas it is only 40% in case of moderate storms when compared to previous cycle. The solar and interplanetary characteristics of the moderate storms driven by coronal mass ejection (CME) are compared for solar cycles 23 and 24 in order to see reduction in geoeffectiveness has anything to do with the occurrence of moderate storm. Though there is reduction in the occurrence of moderate storms, the Dst distribution does not show much difference. Similarly, the solar source parameters like CME speed, mass, and width did not show any significant variation in the average values as well as the distribution. The correlation between VBz and Dst is determined, and it is found to be moderate with value of 0.68 for cycle 23 and 0.61 for cycle 24. The magnetospheric energy flux parameter epsilon (ε) is estimated during the main phase of all moderate storms during solar cycles 23 and 24. The energy transfer decreased in solar cycle 24 when compared to cycle 23. These results are significantly different when all geomagnetic storms are taken into consideration for both the solar cycles.

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The formation of a transient current system near the inner edge of the magnetospheric tail current

Калегаев

Nazarkov

2015

Moscow Univ. Phys.

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On the large-scale structure of the tail current as measured by THEMIS

Cited by 3 publications

References 30 publications

Mercury's cross‐tail current sheet: Structure, X‐line location and stress balance

Mercury's cross‐tail current sheet: Structure, X‐line location and stress balance

On the reduced geoeffectiveness of solar cycle 24: A moderate storm perspective

The formation of a transient current system near the inner edge of the magnetospheric tail current

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