Figures for ``Observation of Polar Plumes at High Solar Altitudes''

(Thumbnails are also available)

Figure 1: Polar plumes extending from the surface of the Sun out to 30 R above the surface (in the image plane). This image is in conformal azimuthal coordinates. Vertical lines in the image represent radial lines in normal space, and the radial direction is scaled logarithmically. Four instruments' data are presented. The C-3, HAO K-coronameter, and EIT images have been smoothed and detrended as described in the text. The C-2 image has been subjected only to radial filtering, to demonstrate by coalignment that the C-3 features are solar and not artificial. REFERENCE IN TEXT LARGER VERSION OF FIGURE POSTSCRIPT VERSION OF FIGURE

---

Figure 2: The outermost (C3) portion of Figure 1, transformed back into normal image coordinates. This is a processed, radially-filtered image of the top half of the C-3 field of view, showing the actual appearance of the plumes as radial structures. REFERENCE IN TEXT LARGER VERSION OF FIGURE POSTSCRIPT VERSION OF FIGURE

	


	

	

Figure 3: Plot of measured LASCO image intensity (in digitizer counts
per pixel per second) versus azimuth for several altitudes in Figure
2.  The plots are centered on zero because the data are unsharp
masked.  At the highest plotted image-plane altitude (25 R), the plume-interplume contrast
is approximately 0.2 count sec-1
pixel-1 peak to peak (0.07 count
sec-1 pixel-1 RMS).
	
	

	REFERENCE IN TEXT
	
	

	LARGER VERSION OF FIGURE

 POSTSCRIPT VERSION OF FIGURE
	
	











	


	

	

Figure 4: Plots of intensity and flow-normalized intensity measured at
the LASCO focal plane, versus altitude in several of the plumes in
Figure 2.  The flow-normalized intensity has been multiplied by
b3 (the cube of the image-plane
altitude) to remove the effects of illumination and rarefaction in a
constant-speed, radial geometry wind.
	
	

	REFERENCE IN TEXT
	
	

	LARGER VERSION OF FIGURE

 POSTSCRIPT VERSION OF FIGURE
	
	












	


	

	
 
Figure 5: Geometry of a radially expanding plume, used in the
derivation of equations (1) and (2) in the text.  Plumes tilted out of
the plane of the sky are seen at higher altitudes than is apparent on
the film plane, an effect that is partially cancelled out by the
thicker cross-section of the tilted plume along the line of sight.
	
	

	REFERENCE IN TEXT
	
	

	LARGER VERSION OF FIGURE

 POSTSCRIPT VERSION OF FIGURE