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Coronagraph observations of inflows during high solar activity
Simnett, G. M.; Howard, R. A.; Sheeley, N. R., Jr. +2 more
Since the start of the SOHO mission three years ago, the Large Angle Spectrometric Coronagraph (LASCO) has recorded numerous examples of small, faint features moving inward through the corona. The inflows are observed at heliocentric distances of 2-4 Rs and became increasingly common during 1998, as solar and coronal mass ejection (CME)…
Streamer disconnection events observed with the LASCO coronagraph
Lamy, P. L.; Howard, R. A.; Sheeley, N. R., Jr. +2 more
We present Large Angle Spectrometric Coronagraph (LASCO) observations of two events that suggest magnetic disconnection in coronal streamers. During the 1-2 days preceding each event, successions of narrow looptops are seen rising slowly through the 2-6 RS field of view, forming a bright streamer stalk which continues to elongate with t…
Direct evidence of the interstellar gas flow velocity in the pickup ion cut-off as observed with SOHO CELIAS CTOF
Bochsler, P.; Klecker, B.; Möbius, E. +9 more
He+ pickup ions as observed with SOHO CELIAS CTOF have been analyzed for the time period DOY 160-190, 1996. During this time of the year the Earth is on the upwind side of the interstellar gas flow with respect to the sun. The high-speed cut-off in the frame of the sun is significantly higher v/Vsw = 2, predicted for pickup i…
Ion-cyclotron wave dissipation channel for Alfvén waves
Kaghashvili, Edisher Kh.
The effect of inhomogeneous velocity flow on Alfvén wave dynamics in the solar wind is investigated. Unlike existing studies in this field that model energy deposition from high-frequency waves to solar wind particles, we consider here the possibility of obtaining high-frequency waves (in this case fast magnetosonic waves) from the ordinary Alfvén…
Radial evolution of density structure in the solar corona
Habbal, Shadia Rifai; Woo, Richard
White-light measurements made by the SOHO coronagraphs (LASCO for Large Angle Spectrometric Coronagraph) and the HAO Mauna Loa Mk III K-coronameter are combined to follow the evolution of path-integrated density structure in the solar corona overlying both coronal hole and quiet Sun regions from 1.15 to 5.5 Ro. The global imaging provid…
Correction to “The interplanetary events of January-May, 1997 as inferred from energetic particle data, and their relationship with solar events”
St. Cyr, O. C.; Cane, H. V.; Richardson, I. G.