Search Results - "Kepko, L."

The Source, Significance, and Magnetospheric Impact of Periodic Density Structures Within Stream Interaction Regions by Kepko, L., Viall, N. M.

“…We present several examples of magnetospheric ultralow frequency pulsations associated with stream interaction regions and demonstrate that the observed…”
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Quantifying the Mesoscale Contribution to FACs During a Magnetospheric Substorm by Gasparini, S., Kepko, L., Laundal, K. M.

“…Mesoscales, which couple small to large scales, and vice‐versa, are critical to the magnetosphere‐ionosphere coupling. Optical and radar measurements indicate…”
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Periodic Mesoscale Density Structures Comprise a Significant Fraction of the Solar Wind and Are Formed at the Sun by Kepko, L., Viall, N. M., DiMatteo, S.

“…Mesoscale density structures in the solar wind are often periodic, with f ∼ 0.1–5 mHz. They are trains of advected density structures with radial length scales…”
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Inherent Length Scales of Periodic Mesoscale Density Structures in the Solar Wind Over Two Solar Cycles by Kepko, L., Viall, N. M., Wolfinger, K.

“…It is now well established through multiple event and statistical studies that the solar wind at 1 AU contains contains periodic, mesoscale (L ∼ 100–1,000 Mm)…”
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Solar Wind Drivers of Auroral Omega Bands by Cribb, V., Pulkkinen, T. I., Kepko, L., Gallardo‐Lacourt, B., Donovan, E.

“…Omega bands are mesoscale auroral structures emerging as eastward moving quasi‐periodic poleward protrusions well within the closed field line region of the…”
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Preface to the Special Collection: Recollections in Space Physics by Kepko, L., Liemohn, M.

“…Key Point Preface to the 100th anniversary edition of “Recollections in Space Physics” manuscripts…”
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On Differentiating Multiple Types of ULF Magnetospheric Waves in Response to Solar Wind Periodic Density Structures by Di Matteo, S., Villante, U., Viall, N., Kepko, L., Wallace, S.

“…Identifying the nature and source of ultra‐low frequencies (ULF) waves (f ⪅ 4 mHz) at discrete frequencies in the Earth's magnetosphere is a complex task. The…”
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Substorm Current Wedge Revisited by Kepko, L., McPherron, R. L., Amm, O., Apatenkov, S., Baumjohann, W., Birn, J., Lester, M., Nakamura, R., Pulkkinen, T. I., Sergeev, V.

“…Almost 40 years ago the concept of the substorm current wedge was developed to explain the magnetic signatures observed on the ground and in geosynchronous…”
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Implications of L1 Observations for Slow Solar Wind Formation by Solar Reconnection by Kepko, L., Viall, N. M., Antiochos, S. K., Lepri, S. T., Kasper, J. C., Weberg, M.

“…While the source of the fast solar wind is known to be coronal holes, the source of the slow solar wind has remained a mystery. Long time scale trends in the…”
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Unexpected STEVE Observations at High Latitude During Quiet Geomagnetic Conditions by Gallardo‐Lacourt, B., Nishimura, Y., Kepko, L., Spanswick, E. L., Gillies, D. M., Knudsen, D. J., Burchill, J. K., Skone, S. H., Pinto, V. A., Chaddock, D., Kuzub, J., Donovan, E. F.

“…Strong Thermal Emission Velocity Enhancement (STEVE), is a captivating optical phenomenon typically observed in the mid‐latitude ionosphere. This paper…”
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On the Contribution of Dipolarizing Flux Bundles to the Substorm Current Wedge and to Flux and Energy Transport by Birn, J., Liu, J., Runov, A., Kepko, L., Angelopoulos, V.

“…Bursty bulk flows and dipolarizing flux bundles within them play an important role in the transport of mass, energy, and magnetic flux in the magnetotail. On…”
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Mesoscale Structure in the Solar Wind by Viall, N. M., DeForest, C. E., Kepko, L.

“…Structures in the solar wind result from two basic mechanisms: structures injected or imposed directly by the Sun, and structures formed through processing en…”
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SAPS-Associated Explosive Brightening on the Duskside: A New Type of Onset- Like Disturbance by Henderson, M. G., Morley, S. K., Kepko, E. L.

“…Quasi-periodic energetic particle injections have been observed at geosynchronous orbit on the dusk-side during a steady magnetospheric convection event. We…”
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Substorm Current Wedge: Energy Conversion and Current Diversion by Birn, J., Borovsky, J. E., Hesse, M., Kepko, L.

“…Using a magnetohydrodynamic simulation of magnetotail reconnection, flow bursts, and dipolarization, we further investigate the current diversion and energy…”
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Helios Observations of Quasiperiodic Density Structures in the Slow Solar Wind at 0.3, 0.4, and 0.6 AU by Di Matteo, S., Viall, N. M., Kepko, L., Wallace, S., Arge, C. N., MacNeice, P.

“…Following previous investigations of quasiperiodic plasma density structures in the solar wind at 1 AU, we show using the Helios1 and Helios2 data their first…”
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The Magnetospheric Source Region of the Bright Proton Aurora by Spanswick, E., Donovan, E., Kepko, L., Angelopoulos, V.

“…The bright proton aurora is generally understood to be the projection of the Central Plasma Sheet where there is sufficient particle energy to cause auroral…”
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Observations of discrete, global magnetospheric oscillations directly driven by solar wind density variations by Kepko, L., Spence, H. E.

“…In this paper we present six events in which both the time series and the spectral content of solar wind number density fluctuations and magnetospheric…”
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Polar Cap Boundary Identification Using Redline Optical Data and DMSP Satellite Particle Data by Gallardo‐Lacourt, B., Wing, S., Kepko, L., Gillies, D. M., Spanswick, E. L., Roy, E. A., Donovan, E. F.

“…The location of the polar cap boundary is typically determined by using low‐orbit satellite measurements in which the boundary is identified by its unique…”
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Relative occurrence rates and connection of discrete frequency oscillations in the solar wind density and dayside magnetosphere by Viall, N. M., Kepko, L., Spence, H. E.

“…We present an analysis of the occurrence distributions of statistically significant apparent frequencies of periodic solar wind number density structures and…”
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Global Observations of Magnetospheric High-m Poloidal Waves During the 22 June 2015 Magnetic Storm by Le, G., Chi, P. J., Strangeway, R. J., Russell, C. T., Slavin, J. A., Takahashi, K., Singer, H. J., Anderson, B. J., Bromund, K., Fischer, D., Kepko, E. L., Magnes, W., Nakamura, R., Plaschke, F., Torbert, R. B.

“…We report global observations of high-m poloidal waves during the recovery phase of the 22 June 2015 magnetic storm from a constellation of widely spaced…”
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