Possible MDI Participation in JOP 20

Viggo Hansteen, University of Oslo

I am "JOP leader" for JOP 020 "Evidence for Nano-Flares in Coronal and Transition Region Lines" which, in short, proposes to look for the line brightenings and line shifts that may give evidence of the passage of nano-flare generated waves, should nano-flares be responsible for heating the corona.

The observations are planned as follows:
The SUMER slit will be placed on a given quiet sun region and observations of line intensities and profiles for lines characteristic of various transition region and coronal temperatures (ie C IV 1548 and Ne VIII 770 or N V 1238 and Mg X 609) )will be taken with a cadence of roughly 10s. At the same CDS will raster over a region (hopefully) covering the SUMER slit with a lower cadence (~90s) but with a larger variety of lines. EIT has promised to cover the same region with a fairly high (~90s) cadence in the Fe 171 band.

Since the waves eventually generated by nanoflares will be intimately connected to the magnetic field I feel it would be useful to have high resolution magnetograms of the region the JOP covers. In addition it would be very useful to see what the photospheric velocity field was like at the time of observation. I have heard that you have a mode where both the magnetic and the velocity information is brought down at "half" resolution. I hope that MDI is interested in supporting JOP 20 in this way or in any other that you may deem more relevant.

As far as I understand the way to get coordinated observations scheduled is to have a presence of "someone" interested at the SOI monthly planning meetingsare scheduled on the Tuesday following each SPWG. I will contact Ted Tarbell and ask him to fill this role. The decision to schedule JOP 20 is to made at the SPWG meeting in August. I plan to run the JOP during the week of September 9-15 at which time I will be at Goddard.

A fuller description of JOP 020 can be found on the SOHO JOP pages: http://sohowww.nascom.nasa.gov/operations/JOPs/jop020.html