MLSO Mark-III K-Coronameter
Coronal Mass Ejection

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16 June 1997 . . . Day of year: 167

Direct ImageSubtraction Image
[Direct Image] [Subt. Image]
22:10 UT22:10 UT minus 19:53 UT

Event Information

Event Description

This event was visible in the MK3 field of view as well as LASCO C2 and C3. While only the prominence "core" material was visible in MK3, we were able to obtain a high time cadence of measurements for this material because of the slow moving nature of the feature. The core is visible in MK3 from 20:00 UT until 23:12 UT and remains visible in LASCO from 23:31 until 03:30 the following day. Loop, cavity and core measurements were possible in LASCO C2. As can be seen in the MK3 movies, this event is very slow. The final speed of the core material at the end of the C2 field of view was 108 km/sec.

There is a MK3 direct-image movie [MPEG, 720 KB] and an H-Alpha movie [MPEG, 394 KB] (to track the prominence material) for this event. In addition, there is a MK3 subtraction movie [MPEG, 1.04 MB].

There are very beautiful loop and cavity features visible in the LASCO C2 and C3 data. At the time these trajectories were done, LASCO C3 data were not available. We will include the C3 data in the trajectories and post them as soon as possible.

Here are the links to a LASCO C2 movie [MPEG, 270 KB] and a LASCO C3 movie [MPEG, 144 KB] of this event.

Event Properties

There were a total of 83 data points obtained for use in trajectory fits. Of those, 16 were for the outer loop, 16 for the cavity, and 51 for the core feature.
The event times were from 21:48UT until 03:30UT . These trajectory estimates were taken from the MK3 and LASCO C2 datasets (C3 will be added shortly). 

Central Position Angle:   ~280 - Loop	
   (in degrees)		  ~275 - Cavity 
			  ~299 - Core 	


Width (degrees)		  ~13  - Core (MK3)
The following data is obtained from performing a second order, least squares fit of the trajectory data points (Hundhausen, et al, 1994) : 
Start Times (UT):	  19:59:53 - Loop    
			  13:45:40 - Cavity  
			  18:22:53 - Core    

Start Heights (Solar Radii):   2.8 - Loop  
			       1.0 - Cavity 
			       1.4 - Core  

Final Speeds (km/s):	     108.6 - Loop	
			      92.5 - Cavity 
			      68.4 - Core   
				

Accelerations (km/s^2):	      0.007 - Loop   
			      0.002 - Cavity 
			      0.004 - Core
The above numbers were produced from a second-order fit of trajectory data which began in MK3 and ended in LASCO C3. Estimated start times, start heights, final speeds and accelerations are available in each individual data set (MK3, C2, and C3) where enough data points were available. That information is not presented here. Final speeds were evaluated at last data point in C3.

Trajectory Plots

(Click on plots to see full size)
First OrderSecond Order
(Loop, Cavity, & Core) (Loop, Cavity & Core)
[First Order Fit] [Second Order Fit]
MK3 and C2MK3 and C2

Image Gallery

A gallery of the `best' direct and the `best' subtraction images (`display' version) from this event may be accessed below.

Be aware that these are only a few of the images that you may access. For a complete list of images, including the `computational' versions, please visit our FTP site.

All times are given in Universal Time (UT) units.

Best MK3 Direct Images

MK3 movie [MPEG, 720 KB]

H-Alpha movie [MPEG, 394 KB]

MK3 images :

Best MK3 Subtraction Images

MK3 movie [MPEG, 1.04 MB]

MK3 images :

References 

Hundhausen, A.J., J.T. Burkepile, and O.C. St.Cyr,
  Speeds of coronal mass ejections:  SMM Observations
  from 1980 and 1984-1989,
  J. Geophys. Res., 99, 6543-6552, 1994.

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