Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995sowi.conf...57a&link_type=abstract
Montana State Univ., International Solar Wind 8 Conference, p. 57
Astronomy and Astrophysics
Astronomy
Heliosphere, Interplanetary Space, Astronomical Observatories, Solar Corona, Sun, Solar Magnetic Field, Stellar Mass Ejection, Ulysses Mission, Interplanetary Magnetic Fields
Scientific paper
The polar crown event of April 14 1994 is one of the largest scale eruptive events observed by the Yohkoh/SXT. Associated with the formation of an arcade of soft X-ray loops at the Sun was the detection of an interplanetary forward/reverse shock event by the Ulysses spacecraft some 4-7 days later. The relationship between the coronal and interplanetary signatures of these events is important if we are to address fully the initialization and consequent acceleration of interplanetary phenomena, such as CMEs and counter-streaming electrons, originating at the Sun. From detailed analysis of the energetics of the arcade formed during the eruption of April 14 1994, we find peak temperatures and emission measures of approximately 5MK and approximately 1048cm-3 respectively. The total thermal content of the arcade loop structure observed in soft X-rays is calculated to be some 5 x 1029 ergs. The development of these parameters as the event proceeds and their relationship to the dynamics of the eruption are investigated. Although spanning a longitudinal range of some 150 degrees the April 14 event displayed the typical helmet streamer structure normally associated with coronal mass ejections These helmet streamers are thought to be related to the global solar magnetic field through the heliospheric current sheet (HCS). The arcade formation, together with the eruption of material into interplanetary space, signifies a large-scale reconfiguration of the coronal magnetic field. We examine the effects of the formation of such a coronal arcade structure on the HCS and discuss the dynamics involved with the passage of a large scale disturbance through the interplanetary magnetic field.
Alexander Dave
Harvey Karen L.
Hoeksema Jon Todd
Hudson Hugh S.
Zhao Xiaopeng
No associations
LandOfFree
The solar/interplanetary event of 14 April 1994 observed by Yohkoh/SXT does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with The solar/interplanetary event of 14 April 1994 observed by Yohkoh/SXT, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The solar/interplanetary event of 14 April 1994 observed by Yohkoh/SXT will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-759892