Search Results - "Watt, J. E."

Statistical characterization of the growth and spatial scales of the substorm onset arc by Kalmoni, N. M. E., Rae, I. J., Watt, C. E. J., Murphy, K. R., Forsyth, C., Owen, C. J.

“…We present the first multievent study of the spatial and temporal structuring of the aurora to provide statistical evidence of the near‐Earth plasma…”
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Intense chorus waves are the cause of flux-limiting in the heart of the outer radiation belt by Chakraborty, S., Mann, I. R., Watt, C. E. J., Rae, I. J., Olifer, L., Ozeke, L. G., Sandhu, J. K., Mauk, B. H., Spence, H.

“…Chorus waves play a key role in outer Van Allen electron belt dynamics through cyclotron resonance. Here, we use Van Allen Probes data to reveal a new and…”
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In situ spatiotemporal measurements of the detailed azimuthal substructure of the substorm current wedge by Forsyth, C., Fazakerley, A. N., Rae, I. J., J. Watt, C. E., Murphy, K., Wild, J. A., Karlsson, T., Mutel, R., Owen, C. J., Ergun, R., Masson, A., Berthomier, M., Donovan, E., Frey, H. U., Matzka, J., Stolle, C., Zhang, Y.

“…The substorm current wedge (SCW) is a fundamental component of geomagnetic substorms. Models tend to describe the SCW as a simple line current flowing into the…”
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Do magnetospheric shear Alfvén waves generate sufficient electron energy flux to power the aurora? by Watt, C. E. J., Rankin, R.

“…Using a self‐consistent drift‐kinetic simulation code, we investigate whether electron acceleration owing to shear Alfvén waves in the plasma sheet boundary…”
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The correlation of ULF waves and auroral intensity before, during and after substorm expansion phase onset by Rae, I. Jonathan, Watt, Clare E. J., Murphy, Kyle R., Frey, Harald U., Ozeke, Louis G., Milling, David K., Mann, Ian R.

“…We present case studies of the evolution of Ultra‐Low Frequency (ULF) magnetic wave amplitudes and auroral intensity through the late growth phase and the…”
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Self‐consistent formation of a 0.5 cyclotron frequency gap in magnetospheric whistler mode waves by Ratcliffe, H., Watt, C. E. J.

“…Decades of in situ observations of whistler mode waves in Earth's magnetosphere reveal that there is frequently a gap in the spectral power at around half the…”
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Optical characterization of the growth and spatial structure of a substorm onset arc by Rae, I. J., Watt, C. E. J., Mann, I. R., Murphy, K. R., Samson, J. C., Kabin, K., Angelopoulos, V.

“…We present a detailed case study of the characteristics of auroral forms that constitute the first ionospheric signatures of substorm expansion phase onset…”
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Particle‐in‐Cell Experiments Examine Electron Diffusion by Whistler‐Mode Waves: 2. Quasi‐Linear and Nonlinear Dynamics by Allanson, O., Watt, C. E. J., Ratcliffe, H., Allison, H. J., Meredith, N. P., Bentley, S. N., Ross, J. P. J., Glauert, S. A.

“…Test particle codes indicate that electron dynamics due to interactions with low amplitude incoherent whistler mode‐waves can be adequately described by…”
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Control of ULF Wave Accessibility to the Inner Magnetosphere by the Convection of Plasma Density by Degeling, A. W., Rae, I. J., Watt, C. E. J., Shi, Q. Q., Rankin, R., Zong, Q.‐G.

“…During periods of storm activity and enhanced convection, the plasma density in the afternoon sector of the magnetosphere is highly dynamic due to the…”
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Inner Magnetospheric ULF Waves: The Occurrence and Distribution of Broadband and Discrete Wave Activity by Murphy, K. R., Inglis, A. R., Sibeck, D. G., Watt, C. E. J., Rae, I. J.

“…Ultralow frequency (ULF) waves are electromagnetic pulsations observed throughout the magnetosphere driven by processes both external and internal to the…”
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A diagnosis of the plasma waves responsible for the explosive energy release of substorm onset by Kalmoni, N. M. E., Rae, I. J., Watt, C. E. J., Murphy, K. R., Samara, M., Michell, R. G., Grubbs, G., Forsyth, C.

“…During geomagnetic substorms, stored magnetic and plasma thermal energies are explosively converted into plasma kinetic energy. This rapid reconfiguration of…”
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Statistical azimuthal structuring of the substorm onset arc: Implications for the onset mechanism by Kalmoni, N. M. E., Rae, I. J., Murphy, K. R., Forsyth, C., Watt, C. E. J., Owen, C. J.

“…The onset of an auroral substorm is generally thought to occur on a quiet, homogeneous auroral arc. We present a statistical study of independently selected…”
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The Role of Localized Compressional Ultra‐low Frequency Waves in Energetic Electron Precipitation by Rae, I. Jonathan, Murphy, Kyle R., Watt, Clare E. J., Halford, Alexa J., Mann, Ian R., Ozeke, Louis G., Sibeck, David G., Clilverd, Mark A., Rodger, Craig J., Degeling, Alex W., Forsyth, Colin, Singer, Howard J.

“…Typically, ultra‐low frequency (ULF) waves have historically been invoked for radial diffusive transport leading to acceleration and loss of outer radiation…”
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Determining the Mode, Frequency, and Azimuthal Wave Number of ULF Waves During a HSS and Moderate Geomagnetic Storm by Murphy, Kyle R., Inglis, Andrew R., Sibeck, David G., Rae, I. Jonathan, Silveira, Marcos, Plaschke, Ferdinand, Claudepierre, Seth G., Nakamura, Rumi

“…Ultralow frequency (ULF) waves play a fundamental role in the dynamics of the inner magnetosphere and outer radiation belt during geomagnetic storms. Broadband…”
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On the nature of ULF wave power during nightside auroral activations and substorms: 2. Temporal evolution by Rae, I. J., Murphy, K. R., Watt, C. E. J., Mann, I. R.

“…We present a statistical analysis of the time evolution of ground magnetic fluctuations in three (12–48 s, 24–96 s and 48–192 s) period bands during nightside…”
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Automated determination of auroral breakup during the substorm expansion phase using all-sky imager data by Murphy, Kyle R., Miles, David M., Watt, Clare E. J., Rae, I. Jonathan, Mann, Ian R., Frey, Harald U.

“…This paper describes a novel method for quantitatively and routinely identifying auroral breakup following substorm onset using the Time History of Events and…”
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What effect do substorms have on the content of the radiation belts? by Forsyth, C., Rae, I. J., Murphy, K. R., Freeman, M. P., Huang, C.‐L., Spence, H. E., Boyd, A. J., Coxon, J. C., Jackman, C. M., Kalmoni, N. M. E., Watt, C. E. J.

“…Substorms are fundamental and dynamic processes in the magnetosphere, converting captured solar wind magnetic energy into plasma energy. These substorms have…”
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Using the cold plasma dispersion relation and whistler mode waves to quantify the antenna sheath impedance of the Van Allen Probes EFW instrument by Hartley, D. P., Kletzing, C. A., Kurth, W. S., Bounds, S. R., Averkamp, T. F., Hospodarsky, G. B., Wygant, J. R., Bonnell, J. W., Santolík, O., Watt, C. E. J.

“…Cold plasma theory and parallel wave propagation are often assumed when approximating the whistler mode magnetic field wave power from electric field…”
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Temporal evolution and electric potential structure of the auroral acceleration region from multispacecraft measurements by Forsyth, C., Fazakerley, A. N., Walsh, A. P., Watt, C. E. J., Garza, K. J., Owen, C. J., Constantinescu, D., Dandouras, I., Fornaçon, K.-H., Lucek, E., Marklund, G. T., Sadeghi, S. S., Khotyaintsev, Y., Masson, A., Doss, N.

“…Bright aurorae can be excited by the acceleration of electrons into the atmosphere in violation of ideal magnetohydrodynamics. Modeling studies predict that…”
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A direct examination of the dynamics of dipolarization fronts using MMS by Yao, Z. H., Rae, I. J., Guo, R. L., Fazakerley, A. N., Owen, C. J., Nakamura, R., Baumjohann, W., Watt, C. E. J., Hwang, K. J., Giles, B. L., Russell, C.T., Torbert, R. B., Varsani, A., Fu, H. S., Shi, Q. Q., Zhang, X.‐J.

“…Energy conversion on the dipolarization fronts (DFs) has attracted much research attention through the suggestion that intense current densities associated…”
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