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Tracking a major interplanetary disturbance with SMEI
Price, S.; Simnett, G. M.; Webb, D. F. +14 more
We present the first clear observations of an Earth-directed interplanetary disturbance tracked by the Solar Mass Ejection Imager (SMEI). We find that this event can be related to two halo CMEs seen at the Sun about 2 days earlier, and which merged in transit to 1 AU. The disturbance was seen about 16 hours before it reached Earth,and caused a sev…
Solar EUV irradiance variability derived from terrestrial far ultraviolet dayglow observations
Judge, D. L.; Meier, R. R.; Lean, J. L. +7 more
Remotely sensed ultraviolet emissions from the Earth's upper atmosphere are shown to mirror fluctuations in solar EUV irradiance during July 2002, including the overall increase and decrease as the Sun rotated, and episodic increases associated with multiple solar flares. The TIMED/GUVI dayglow observations are used to derive a new quantity, Q
Geometry of an interplanetary CME on October 29, 2003 deduced from cosmic rays
Marubashi, K.; Bieber, J. W.; Evenson, P. +16 more
A coronal mass ejection (CME) associated with an X17 solar flare reached Earth on October 29, 2003, causing an ~11% decrease in the intensity of high-energy Galactic cosmic rays recorded by muon detectors. The CME also produced a strong enhancement of the cosmic ray directional anisotropy. Based upon a simple inclined cylinder model, we use the an…
The interaction of comet 153P/Ikeya-Zhang with interplanetary coronal mass ejections: Identification of fast ICME signatures
Brandt, John C.; Jones, Geraint H.
The active comet 153P/Ikeya-Zhang possessed a highly-variable plasma tail. Favorable circumstances allowed the identification of the impact of fast ICMEs with the comet. The impact produces a specific morphology including a characteristic scalloped appearance which suggests that the ICME magnetic field drapes around preexisting tail density enhanc…
Structure of interplanetary magnetic cloud on April 16, 1999 and its origin estimated by fitting the torus-shaped flux rope model
Ishibashi, Hiromitsu; Marubashi, Katsuhide
We examined the relationship between interplanetary magnetic cloud observed by the ACE satellite on April 16, 1999 and its solar origin. The solar and interplanetary background was relatively quiet for 10 clear days before April 16, enabling us to unambiguously assume the solar origin of the magnetic cloud. However, the results of fitting a consta…
A slow streamer blowout at the Sun and Ulysses
Bemporad, A.; Poletto, G.; Suess, S. T.
On 10 June 2000 a streamer on the southeast limb slowly disappeared from LASCO/C2 over ~10 hours. A small CME was reported in C2. A substantial interplanetary CME (ICME) was later detected at Ulysses, which was at quadrature with the Sun and SOHO at the time. This detection illustrates the properties of an ICME for a known solar source and demonst…
Observational evidence of pitch angle isotropization by IMF waves
Bochsler, P.; Klecker, B.; Möbius, E. +4 more
A statistical analysis of interstellar He+ pickup ion measurements from SOHO/CTOF combined with magnetic field data from WIND/MFI enable quantitative study of wave-particle interactions in the inner heliosphere for the first time. Magnetic field vector measurements with a time resolution of 3 seconds are used to determine power spectrum…