Search Results - "LUMMERZHEIM, D"

Changes in the Magnetic Field Topology and the Dayside/Nightside Reconnection Rates in Response to a Solar Wind Dynamic Pressure Front: A Case Study by Boudouridis, A., Connor, H. K., Lummerzheim, D., Ridley, A. J., Zesta, E.

“…One of the most significant observations associated with a sharp enhancement in solar wind dynamic pressure, PSW, is the poleward expansion of the auroral oval…”
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Balloons in the Earth's Auroral Science—BALBOA's Modern Exploration by Zhou, X.‐Y., Rafol, S. B., Michell, R. G., Hampton, D., Geach, C., Berk, A., Lummerzheim, D., He, Y.‐T.

“…Since 1892, when an aurora was first imaged by Martin Brendel, a German physicist, auroral forms and their dynamics have been acquired only when the aurora is…”
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Enhanced solar wind geoeffectiveness after a sudden increase in dynamic pressure during southward IMF orientation by Boudouridis, A., Zesta, E., Lyons, L. R., Anderson, P. C., Lummerzheim, D.

“…It is well known that a persistent southward Interplanetary Magnetic Field (IMF) produces increased geomagnetic activity. It has recently been shown that a…”
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Effect of solar wind pressure pulses on the size and strength of the auroral oval by Boudouridis, A., Zesta, E., Lyons, R., Anderson, P. C., Lummerzheim, D.

“…It has recently been found that solar wind dynamic pressure changes can dramatically affect the precipitation of magnetospheric particles on the high‐latitude…”
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Development of a near‐infrared balloon‐borne camera for dayside and sunlit auroral observations by Zhou, X.‐Y., Lummerzheim, D., Gladstone, R., Rafol, S. B., Gunapala, S., He, Y.‐T., Hampton, D.

“…Imaging aurora in daylight is a difficult and challenging task. The brightness of the sunlit atmosphere overwhelms the auroral emissions at visible…”
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Localized ionization patches in the nighttime ionosphere of Mars and their electrodynamic consequences by Fillingim, M.O., Peticolas, L.M., Lillis, R.J., Brain, D.A., Halekas, J.S., Lummerzheim, D., Bougher, S.W.

“…Using an electron transport model, we calculate the electron density of the electron impact-produced nighttime ionosphere of Mars and its spatial structure. As…”
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Multi-instrument observations of soft electron precipitation and its association with magnetospheric flows by Liang, Jun, Spanswick, E., Nicolls, M. J., Donovan, E. F., Lummerzheim, D., Liu, W. W.

“…We present a multi‐instrument study on the variations of optical auroras and ionospheric electron densities during an interval of a series of fast earthward…”
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Experimental tests of the generation mechanism of auroral medium frequency burst radio emissions by Bunch, N. L., LaBelle, J., Weatherwax, A. T., Hughes, J. M., Lummerzheim, D.

“…Medium frequency (MF) burst is an impulsive auroral radio emission at 1.3–4.5 MHz commonly detected by ground‐based instruments for a few minutes at substorm…”
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Model calculations of electron precipitation induced ionization patches on the nightside of Mars by Fillingim, M. O., Peticolas, L. M., Lillis, R. J., Brain, D. A., Halekas, J. S., Mitchell, D. L., Lin, R. P., Lummerzheim, D., Bougher, S. W., Kirchner, D. L.

“…Using an electron transport model, we investigate the effect of electron precipitation on the electron density and total electron content in the nightside…”
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Nightside flow enhancement associated with solar wind dynamic pressure driven reconnection by Boudouridis, A., Lyons, L. R., Zesta, E., Ruohoniemi, J. M., Lummerzheim, D.

“…Over the past few years the prominent role of solar wind dynamic pressure in enhancing dayside and nightside reconnection and driving enhanced ionospheric…”
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On magnetospheric electron impact ionisation and dynamics in Titan's ram-side and polar ionosphere : a Cassini case study by AGREN, K, WAHIUND, J.-E, WAITE, J. H, COATES, A. J, LEWIS, G. R, YOUNG, D. T, BERTUCCI, C, DOUGHEMY, M. K, MODOLO, R, LUMMERZHEIM, D, GALAND, M, MÜLLER-WODARG, I, CANU, P, KURTH, W. S, CRAVENS, T. E, YELLE, R. V

“…We present data from the sixth Cassini flyby of Titan (T5), showing that the magnetosphere of Saturn strongly interacts with the moon's ionosphere and…”
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Ground-based optical observations of hydrogen emission in the auroral substorm by Deehr, C., Lummerzheim, D.

“…A combination of all‐sky imagers (ASTV) and meridian‐scanning photometers (MSP) was used to identify the optical signature of the growth phase, onset,…”
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Contribution of proton precipitation to space-based auroral FUV observations by Galand, M., Lummerzheim, D.

“…Imaging from space offers a unique way to access the global picture, and its temporal variability, of the particle energy input over the auroral ovals…”
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PFISR and ROPA observations of pulsating aurora by Jones, S.L., Lessard, M.R., Fernandes, P.A., Lummerzheim, D., Semeter, J.L., Heinselman, C.J., Lynch, K.A., Michell, R.G., Kintner, P.M., Stenbaek-Nielsen, H.C., Asamura, K.

“…Previous observations have shown that pulsating aurora sometimes occurs with patches of a vertical extent that is thinner than would be expected for aurora…”
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Sounding rocket study of two sequential auroral poleward boundary intensifications by Mella, M. R., Lynch, K. A., Hampton, D. L., Dahlgren, H., Kintner, P. M., Lessard, M., Lummerzheim, D., Lundberg, E. T., Nicolls, M. J., Stenbaek-Nielsen, H. C.

“…The Cascades‐2 sounding rocket was launched on 20 March 2009 at 11:04:00 UT from the Poker Flat Research Range in Alaska, and flew across a series of poleward…”
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Observations of colocated optical and radar aurora by Bahcivan, H., Hysell, D. L., Lummerzheim, D., Larsen, M. F., Pfaff, R. F.

“…This article presents case studies of common volume observations of the E region radar aurora obtained with a 30 MHz imaging radar and the optical aurora…”
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Electrodynamics of an omega-band as deduced from optical and magnetometer data by VANHAMÄKI, H, KAURISTIE, K, AMM, O, SENIOR, A, LUMMERZHEIM, D, MILAN, S

“…We investigate an omega-band event that took place above northern Scandinavia around 02:00–02:30 UT on 9 March 1999. In our analysis we use ground based…”
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Magnetospheric reconnection driven by solar wind pressure fronts by BOUDOURIDIS, A, ZESTA, E, LYONS, L. R, ANDERSON, P. C, LUMMERZHEIM, D

“…Recent work has shown that solar wind dynamic pressure changes can have a dramatic effect on the particle precipitation in the high-latitude ionosphere. It has…”
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On wind-driven electrojets at magnetic cusps in the nightside ionosphere of Mars by Fillingim, M. O., Lillis, R. J., England, S. L., Peticolas, L. M., Brain, D. A., Halekas, J. S., Paty, C., Lummerzheim, D., Bougher, S. W.

“…Mars has a complex magnetic topology where crustal magnetic fields can interact with the solar wind magnetic field to form magnetic cusps. On the nightside,…”
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Electron transport and energy degradation in the ionosphere: evaluation of the numerical solution, comparison with laboratory experiments and auroral observations by D. Lummerzheim, J. Lilensten

“…Auroral electron transport calculations are a critical part of auroral models. We evaluate a numerical solution to the transport and energy degradation…”
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