Search Publications
Toroidal-shaped interplanetary disturbance associated with the halo coronal mass ejection event on 14 July 2000
Kojima, Masayoshi; Tokumaru, Munetoshi; Fujiki, Ken'ichi +2 more
Interplanetary scintillation (IPS) measurements made with the 327 MHz radio telescopes of the Solar-Terrestrial Environment Laboratory, Nagoya University, have been used to study a three-dimensional structure of the interplanetary (IP) disturbance associated with the halo coronal mass ejection (CME) event on 14 July 2000 (the so-called "Bastille D…
Ulysses observations of solar energetic particles from the 14 July 2000 event at high heliographic latitudes
Giacalone, J.; McKibben, R. B.; Zhang, Ming +4 more
At the time of the solar flare on the Bastille Day of 2000, the Ulysses spacecraft was at 3.17 AU from the Sun, 62° south in heliographic latitude, and 116° in longitude east of the Earth. Solar wind and magnetic field measurements by Ulysses indicate that the coronal mass ejection (CME) of this event had a limited size in both latitude and longit…
A numerical study on the acceleration and transit time of coronal mass ejections in the interplanetary medium
Gopalswamy, Nat; Lara, Alejandro; GonzáLez-Esparza, J. AméRico +2 more
Recently, an empirical model of the acceleration/deceleration of coronal mass ejections (CMEs) as they propagate through the solar wind was developed using near-Sun (coronagraphic) and near-Earth (in situ) observations [, 2000, 2001a]. This model states and quantifies the fact that slow CMEs are accelerated and fast CMEs are decelerated toward the…
A statistical study of compressional waves in the tail current sheet
Balogh, A.; Zhang, T. L.; Klecker, B. +9 more
A statistical study of the Cluster FGM data is performed on compressional waves for 68 selected 12 min intervals when the spacecraft are in or near the neutral sheet. The data are well distributed in local time between 2100 and 0300 LT. The compressional wave power is strongly dependent on the maximum plasma flow velocity (based on the CIS-CODIF d…
Radial dependence of intermittency in the fast polar solar wind magnetic field using Ulysses
Balogh, A.; Pagel, C.
The Ulysses spacecraft, in a polar orbit of the Sun, spent almost 3 years sampling the pure polar coronal fast wind at solar minimum between 1994 and 1996. Turbulence in coronal fast wind, unaffected by stream shears with slow solar wind, evolves more slowly than fast wind turbulence in the ecliptic and is a more homogenous system. However, it is …
Signs of magnetic helicity in interplanetary coronal mass ejections and associated prominences: Case study
Hu, Qiang; Ruzmaikin, Alexander; Martin, Sara
We study the distribution of magnetic helicity in interplanetary coronal mass ejections (CMEs) separated into magnetic clouds and remnants of the prominence structures for three cases with identified remnants of prominences. The magnetic configurations of magnetic clouds and prominence remnants can satisfactorily be described by the flux rope appr…
Io's auroral limb glow: Hubble Space Telescope FUV observations
Moos, H. W.; Strobel, D. F.; Retherford, K. D.
Observations of Io's FUV aurora were obtained using the Space Telescope Imaging Spectrograph (STIS) on several occasions between 1997 and 2000. The STIS first-order long-slit spectroscopy mode and 2″ wide slit were used to produce nearly monochromatic images of Io. These images reveal several distinct auroral features, including limb brightened em…
Evidence for electrostatic decay in the solar wind at 5.2 AU
MacDowall, R. J.; Scime, E. E.; Thejappa, G. +1 more
The Unified Radio and Plasma wave Experiment (URAP) on the Ulysses spacecraft provides in situ observations of Langmuir waves and ion-acoustic waves in the solar wind. The observations presented in this paper were obtained at 5.2 AU from the Sun. Low-frequency (20-200 Hz in the spacecraft frame) electric field signals are observed coincident in ti…
Plasma sheet structure during strongly northward IMF
Petrukovich, A. A.; Balogh, A.; Glassmeier, K. -H. +5 more
On 14 September 2001, under stongly northward IMF conditions Cluster registered several fast magnetic field polarity changes which are usually attributed to thin (near-equatorial) current sheet crossings. However, the IMF was northward for the previous 24 hours, the plasma sheet was expanded vertically, filled with cold, dense plasmas with high lo…
Are coronal holes the only source of fast solar wind at solar minimum?
Chen, Y.; Habbal, S. R.; Li, X. +1 more
A two-dimensional (2-D) MHD model of an Alfvén-wave-driven solar wind in the heliospheric meridional plane is presented whereby the consequences of a magnetic field distribution at the Sun that digresses from the standard dipole structure, often used in 2-D MHD models, are explored. The latitudinal distribution of open magnetic flux is specified a…