Results 61 to 70 of about 5,343,913 (293)

Variability of MLT winds and waves over mid-latitude during the 2000/2001 and 2009/2010 winter stratospheric sudden warming [PDF]

Annales Geophysicae, 2012
The mesosphere and lower thermosphere (MLT) wind structure over Wuhan (30° N, 114° E) in 2000/2001 winter and over Langfang (39.4° N, 116.6° E) in 2009/2010 winter are examined to reveal the effects of stratospheric sudden warming (SSW) in mid-low ...
X. Chen, X. Chen, X. Hu, C. Xiao
doaj   +1 more source

A statistical study of the global structure of the ring current [PDF]

, 2004
[1] In this paper we derive the average configuration of the ring current as a function of the state of the magnetosphere as indicated by the Dst index.
Hughes, W. J., Jorgensen, A. M., Singer, H. J., Spence, Harlan E.   +3 more
core   +3 more sources

Intra‐seasonal oscillations observed in the MLT region above UK (52°N, 2°W) and ESRANGE (68°N, 21°E) [PDF]

, 2003
D. Pancheva, N. J. Mitchell, P. T. Younger, Heinz Müller   +3 more
openalex   +2 more sources

Nocturnal and Seasonal Variation of Na and K Layers Simultaneously Observed in the MLT Region at 23°S

Journal of Geophysical Research: Space Physics, 2020
The present work shows for the first time the study of morphology of the mesopause sodium (Na) and potassium (K) layers simultaneously observed by a dual‐beam LIDAR in the Southern Hemisphere.
V. Andrioli, Jiexin Xu, P. Batista, A. Pimenta, L. Resende, S. Savio, P. Fagundes, Guibiao Yang, J. Jiao, Xiaoli Cheng, Chunmiao Wang, Z. Liu   +11 more
semanticscholar   +1 more source

Thermal Equilibrium Curves and Turbulent Mixing in Keplerian Accretion Disks [PDF]

, 1999
We consider vertical heat transport in Keplerian accretion disks, including the effects of radiation, convection, and turbulent mixing driven by the Balbus-Hawley instability, in astronomical systems ranging from dwarf novae (DNe), and soft X-ray ...
Batchelor G.K., Canuto V. M., Cox A. N., Ethan T. Vishniac, Honma F., John K. Cannizzo, Kazantsev A. P., Livio M., Ludwig K., Maeder A., Maeder A., Meyer F., Mineshige S., Mineshige S., Pin‐Gao Gu, Pojmanski G., Rudiger C., Schittkowski K., Shakura N. I., Smak J., Speziale C. G., Talon S., Velikhov E. P., Wood J. H., Zahn J.-P.   +24 more
core   +2 more sources

TIMED Doppler Interferometer measurements of neutral winds at the mesosphere and lower thermosphere and comparison to meteor radar winds [PDF]

Annales Geophysicae
The mesosphere and lower thermosphere (MLT) comprise a highly variable region that forms the transition region between the middle and upper atmosphere.
A. Gauthier, A. Gauthier, A. Gauthier, C. Borries, A. Kozlovsky, D. Janches, P. Brown, P. Brown, D. Vida, C. Jacobi, D. Murphy, M. Tsutsumi, M. Tsutsumi, N. Gulbrandsen, S. Nozawa, M. Lester, J. Kero, N. Mitchell, N. Mitchell, T. Moffat-Griffin, G. Stober, G. Stober   +21 more
doaj   +1 more source

Periodic auroral events at the high‐latitude convection reversal in the 16 MLT region [PDF]

Geophysical Research Letters, 1990
Combined optical and radar observations of two breakup‐like auroral events near the polar cap boundary, within 74–76° MLAT and 1210 – 1240 UT (roughly 1540 – 1610 MLT) on 9 Jan. 1989 are reported. A two‐component structure of the auroral phenomenon is indicated, with a local intensification of the pre‐existing arc as well as a separate, tailward moving
Sandholt, Per Even, Lockwood, Mike
openaire   +1 more source

Spatial distributions of electromagnetic field variations and injection regions during the 20 November 2007 sawtooth event [PDF]

Annales Geophysicae, 2009
We report multi-spacecraft and ground-based observations of a "sawtooth" event on 20 November 2007. For this event, data from three THEMIS, two GOES, and four LANL spacecraft are available as well as those from extensively distributed ground ...
S. Kasahara, Y. Miyashita, T. Takada, M. Fujimoto, V. Angelopoulos, H. U. Frey, J. Bonnell, J. P. McFadden, D. Larson, K. H. Glassmeier, H. U. Auster, W. Magnes, I. Mann   +12 more
doaj   +1 more source

Estimating the location of the open-closed magnetic field line boundary from auroral images [PDF]

, 2010
The open-closed magnetic field line boundary (OCB) delimits the region of open magnetic flux forming the polar cap in the Earth’s ionosphere. We present a reliable, automated method for determining the location of the poleward auroral luminosity boundary
Abel, Gary A., Chisham, Gareth, Freeman, Mervyn P., Longden, Nicola, Sotirelis, Tom   +4 more
core   +3 more sources

A Statistical Model of Inner Magnetospheric Electron Density: Van Allen Probes Observations

Space Weather, 2022
Based on electron density observations between September 2012 and July 2019 from the Electric and Magnetic Field Instrument Suite and Integrated Science (EMFISIS) on board the Van Allen Probes (VAPs) spacecraft, this paper makes a statistical ...
Jing‐Tian Lv, Xiao‐Xin Zhang, Fei He, Rui‐Lin Lin   +3 more
doaj   +1 more source