HR: 0830h
AN: SP11A-03    [Abstracts]
TI: Elemental Abundances in a Sunspot Plume Observed With SERTS
AU: * Brosius, J W
EM: brosius@comstoc.gsfc.nasa.gov
AF: The Catholic University of America, Code 612.1 NASA's Goddard Space Flight Ctr, Greenbelt, MD 20771 United States
AU: Landi, E
EM: landi@medusa1.nrl.navy.mil
AF: Artep, Inc., Code 7660 Naval Research Laboratory, Washington, DC 20375 United States
AU: Thomas, R J
EM: Roger.J.Thomas@nasa.gov
AF: NASA's Goddard Space Flight Ctr, Code 612.1, Greenbelt, MD 20771 United States
AB: We present an EUV spectrum of a sunspot plume obtained with the SERTS sounding rocket experiment. The spectrum contains emission lines from various ionization stages of elements with a low (less than 10 eV) first ionization potential (low FIP: Al, Ca, Fe, Mg, Ni, Si) and a high FIP (C, He, Ne, O). The plume appears much brighter than its surroundings in lines formed at log T around 5.6, i.e., lines of high-FIP Ne VI and low-FIP Mg VI. Based upon the differential emission measure (DEM) derived from all of the lines available, we are able to compare the abundances of low-FIP and high-FIP elements in the plume. Results indicate whether plume plasma abundances are photospheric or coronal.
DE: 7509 Corona
DE: 7546 Transition region
DE: 7549 Ultraviolet emissions
SC: Solar Physics Division - AAS [SP]
MN: 2005 Joint Assembly