Introduction to data for JOP 112 Quadrature observations, 5-18 June 2000.
Steve Suess, 31 January 2001.
For use by the participants in JOP 112
Go/return to the Introduction page Go up to projections of Ulysses footpoint onto LASCO C2 images
Go to projection of Ulysses footpoint onto Wilcox Solar Observatory synoptic magnetic field maps Go to projections of Ulysses footpoint onto Sac. Peak FeXIV synoptic maps
Go to Steve Suess' Home Page Go or return to JOP 112 home page at Harvard-Smithsonian Center for Astrophysics
FeXIV data with projected footpoint of Ulysses
   These three panels show the Sacramento Peak FeXIV data for Carrington rotations 1962, 1963, and 1964, covering times of observation (east and west limb) from day of year (DoY) 110 to DoY 193. This is 20 April 2000 through 10 July 2000 if I computed correctly. 
   The footpoint of Ulysses on 5-18 June 2000 is shown in red on the second and third panels. 
   Note that no coronal hole is shown at the beginning of the Ulysses footprint on 5 June, even though it appears that there was a coronal hole there in the LASCO/C2 data. However, a coronal hole does appear at the location in the next Carrington rotation, marked here in yellow. What probably happened is that the coronal hole appeared in LASCO/C2 and was evident in the solar wind speed before it was visible in the limb data for FeXIV. This is often the case for small but growing coronal holes. 
   Look at the SWOOPS data to see that the solar wind speed rose above 500 km/s at the beginning of JOP 112, indicating the possible presence of a coronal hole. Look at the Wilcox Solar Observatory source surface magnetic field plot to see that the Ulysses footpoint was in a large unipolar region on 5 June but soon after was on a neutral line and the streamer belt. 

   The Sacramento Peak  plots were obtained from the Solar Geophysical Data web page. 

 

Go or return to JOP 112 home page at Harvard-Smithsonian Center for Astrophysics
Go to Steve Suess' Home Page