G. Suryanarayana, Indian Institute of Astrophysics, suryanarayana@iiap.res.in
  K. Hiremath, Indian Institute of Astrophysics, hiremath@iiap.res.in
  M. Hegde, Indian Institute of Astrophysics, manjunath@iiap.res.in

The association between the coronal mass ejections (CMEs) angular width and mass is analyzed using angular width and mass data of about 2000 CMEs from the SOHO LASCO CME Catalog which indicates that CMEs are largely density invariant. Solar activity phenomena such as the CMEs are intimately linked to magnetic fields in the active regions and hence a relationship between the magnitude of active region magnetic field variations and CME dimensions is implied. To obtain a preliminary confirmation for the same, we examine the association between the active region magnetic field variation and CME angular widths. The CME angular widths show good association to the magnetic field variations in the active regions NOAA 10953 and NOAA 11158. Hence, it is implicit that the magnetic field variation leads to angular width and mass variations rendering the CMEs to be density invariant.