The Upgraded CARISMA Magnetometer Array in the THEMIS Era

Mann, I. R.; Milling, D. K.; Rae, I. J.; Ozeke, L. G.; Kale, A.; Kale, Z. C.; Murphy, K. R.; Parent, A.; Usanova, Maria; Pahud, D. M.; Lee, E.-A.; Amalraj, V.; Wallis, D. D.; Angelopoulos, V.; Glaßmeier, K.‐H.; Russell, C. T.; Auster, H. U.; Singer, H. J.

doi:10.1007/978-0-387-89820-9_18

Cited by 104 publications

(121 citation statements)

References 151 publications

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“…−3 and 5 nT, and the IMF B z was predominantly southward (after a southward turning at 04:00-04:15 UT) until 09:00 UT, varying between −5 and 0 nT. THEMIS pseudo-AE index, calculated using the THEMIS array of ground-based magnetometers (Mende et al, 2008;Mann et al, 2008), shows three major activations with maxima of 700, 300, and 600 nT at 04:30, 05:50 and 08:00 UT, respectively. The minimum of the THEMIS AE during the interval of interest was about 100 nT.…”

Section: Discussionmentioning

confidence: 99%

Global properties of magnetotail current sheet flapping: THEMIS perspectives

et al. 2009

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Abstract.A sequence of magnetic field oscillations with an amplitude of up to 30 nT and a time scale of 30 min was detected by four of the five THEMIS spacecraft in the magnetotail plasma sheet. The probes P1 and P2 were at X=−15.2 and −12.7 R E and P3 and P4 were at X=−7.9 R E . All four probes were at −6.5>Y >−7.5 R E (major conjunction). Multi-point timing analysis of the magnetic field variations shows that fronts of the oscillations propagated flankward (dawnward and Earthward) nearly perpendicular to the direction of the magnetic maximum variation (B 1 ) at velocities of 20-30 km/s. These are typical characteristics of current sheet flapping motion. The observed anti-correlation between ∂B 1 /∂t and the Z-component of the bulk velocity make it possible to estimate a flapping amplitude of 1 to 3 R E . The cross-tail scale wave-length was found to be about 5 R E . Thus the flapping waves are steep tail-aligned structures with a lengthwise scale of >10 R E . The intermittent plasma motion with the cross-tail velocity component changing its sign, observed during flapping, indicates that the flapping waves were propagating through the ambient plasma. Simultaneous observations of the magnetic field variations by THEMIS ground-based magnetometers show that the flapping oscillations were observed during the growth phase of a substorm.

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Section: Discussionmentioning

confidence: 99%

Global properties of magnetotail current sheet flapping: THEMIS perspectives

et al. 2009

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“…According to OMNI data (not shown), IMF B z at 1 AU was mainly northward between 0130 and 0710 UT, southward between 0710 and 0725 UT, northward between 0725 and 0748 UT, and turned southward at 0749 UT. THEMIS pseudo-AE (calculated using the THEMIS ground-based magnetometer array [Russell et al, 2008;Mann et al, 2008]) began to gradually increase at $0720 UT and experienced a rapid increase from $60 nT to $200 nT between 0750 and 0800 UT (THEMIS-AE data are available at http://themis.ssl.berkeley.edu/summary. shtml).…”

Section: Observationsmentioning

confidence: 99%

THEMIS observations of an earthward‐propagating dipolarization front

Runov¹,

Angelopoulos²,

Sitnov³

et al. 2009

Geophysical Research Letters

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557

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[1] We report THEMIS observations of a dipolarization front, a sharp, large-amplitude increase in the Z-component of the magnetic field. The front was detected in the central plasma sheet sequentially at X = À20.1 R E (THEMIS P1 probe), at X = À16.7 R E (P2), and at X = À11.0 R E (P3/P4 pair), suggesting its earthward propagation as a coherent structure over a distance more than 10 R E at a velocity of 300 km/s. The front thickness was found to be as small as the ion inertial length. Comparison with simulations allows us to interpret the front as the leading edge of a plasma fast flow formed by a burst of magnetic reconnection in the midtail.

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“…Such low energy particles cannot complete entire drift transits around the Earth during the ULF wavetrain, suggesting that ULF modulation was only active very close to RBSP-A-evolution along the drift path explaining the signals seen further east at RBSP-B. Interestingly, the RBSPs were over the western CARISMA ground-based magnetometer array 29 -with RBSP-A magnetically conjugate to Dawson City. Only this station saw a clear coherent B5.6 mHz ULF wavetrain, the same frequency as the electron flux modulation seen by the Van Allen Probes, suggesting narrow azimuthal spatial localization.…”

Section: Crres Observations and Modellingmentioning

confidence: 99%

Discovery of the action of a geophysical synchrotron in the Earth’s Van Allen radiation belts

et al. 2013

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Although the Earth's Van Allen radiation belts were discovered over 50 years ago, the dominant processes responsible for relativistic electron acceleration, transport and loss remain poorly understood. Here we show evidence for the action of coherent acceleration due to resonance with ultra-low frequency waves on a planetary scale. Data from the CRRES probe, and from the recently launched multi-satellite NASA Van Allen Probes mission, with supporting modelling, collectively show coherent ultra-low frequency interactions which high energy resolution data reveals are far more common than either previously thought or observed. The observed modulations and energy-dependent spatial structure indicate a mode of action analogous to a geophysical synchrotron; this new mode of response represents a significant shift in known Van Allen radiation belt dynamics and structure. These periodic collisionless betatron acceleration processes also have applications in understanding the dynamics of, and periodic electromagnetic emissions from, distant plasma-astrophysical systems.

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The Upgraded CARISMA Magnetometer Array in the THEMIS Era

Cited by 104 publications

References 151 publications

Global properties of magnetotail current sheet flapping: THEMIS perspectives

Global properties of magnetotail current sheet flapping: THEMIS perspectives

THEMIS observations of an earthward‐propagating dipolarization front

Discovery of the action of a geophysical synchrotron in the Earth’s Van Allen radiation belts

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