Search Publications
Interplanetary coronal mass ejections in the near-Earth solar wind during 1996-2002
Cane, H. V.; Richardson, I. G.
We summarize the occurrence of interplanetary coronal mass ejections (ICMEs) in the near-Earth solar wind during 1996-2002, corresponding to the increasing and maximum phases of solar cycle 23. In particular, we give a detailed list of such events. This list, based on in situ observations, is not confined to subsets of ICMEs, such as "magnetic clo…
Spatio-temporal structure of storm-time chorus
Gurnett, D. A.; Pickett, J. S.; Parrot, M. +2 more
We discuss chorus emissions measured by the four Cluster spacecraft at close separations during a geomagnetically disturbed period on 18 April 2002. We analyze the lower band of chorus below one half of the electron cyclotron frequency, measured at a radial distance of 4.4 Earth's radii, within a 2000 km long source region located close to the equ…
Acceleration of the solar wind as a result of the reconnection of open magnetic flux with coronal loops
Fisk, L. A.
There are compelling observations of a clear anticorrelation between solar wind flow speed and coronal electron temperature, as determined from solar wind ionic charge states. A simple theory is presented which can account for these observations, including the functional form of the correlation: Solar wind flow speed squared varies essentially lin…
Energetic particle acceleration and transport at coronal mass ejection-driven shocks
Li, Gang; Zank, G. P.; Rice, W. K. M.
Evidence now exists which suggests that in large solar energetic particle (SEP) events, particles are often accelerated to ∼ MeV energies (and perhaps up to GeV energies) at shock waves driven by coronal mass ejections (CMEs). These energetic particles are of considerable importance to space weather studies since they serve as a precursor signal f…
Jupiter's main auroral oval observed with HST-STIS
Kim, J.; Clarke, J. T.; Cowley, S. W. H. +2 more
An extended series of FUV images obtained on 7 days during winter 2000-2001, with fixed pointing, yielded highly accurate tracking of emisson features as Jupiter rotated. They provided newly detailed measurements of the degree of corotation of auroral emissions and their variations with changing central meridian longitude. This 2-month data set pr…
Multiple magnetic clouds: Several examples during March-April 2001
Wang, S.; Wang, Y. M.; Ye, P. Z.
Multiple magnetic cloud (Multi-MC), which is formed by the overtaking of successive coronal mass ejections (CMEs), is a kind of complex structure in interplanetary space. Multi-MC is worthy of notice due to its special properties and potential geoeffectiveness. Using the data from the ACE spacecraft, we identify the three cases of Multi-MC in the …
Internal structure of magnetic clouds: Plasma and composition
Lynch, B. J.; Antiochos, S. K.; Zurbuchen, T. H. +1 more
A comprehensive analysis of magnetic clouds observed by the Advanced Composition Explorer (ACE) spacecraft from February 1998 to July 2001 is presented. The magnetic field data from the MAG instrument is fit with the cylindrically symmetric, linear force-free model and the fit parameter distributions are examined. This magnetic field model enables…
Forecasting solar wind structures and shock arrival times using an ensemble of models
Dryer, M.; Smith, Z.; Fry, C. D. +3 more
Forecasting the time of arrival at Earth of interplanetary shocks following solar metric type II activity is an important first step in the establishment of an operational space weather prediction system. The quality of the forecasts is of utmost importance. The performances of the shock time of arrival (STOA) and interplanetary shock propagation …
Acceleration of coronal mass ejections
Chen, James; Krall, Jonathan
The acceleration of coronal mass ejections (CMEs) is examined focusing on three specific questions raised by observations: (1) what determines the height beyond which a CME exhibits no rapid acceleration, (2) why is the main acceleration of CMEs typically limited to below 2-3 solar radii, and (3) are distinct mechanisms required to explain the app…
Jupiter's polar auroral emissions
Kim, J.; Clarke, J. T.; Cowley, S. W. H. +3 more
This paper reports a study of Jupiter's polar auroral emissions observed in an extended series of FUV images. They were obtained on seven days, during winter 2000-2001, with the STIS camera on board the Hubble Space Telescope. The fixed pointing yielded highly accurate and consistent tracking of emisson features as Jupiter rotated, allowing the an…