JOP: Explosive events in the solar atmosphere with HRTS JOP leader: Ken Dere (NRL) (202)-767-2161 dere@halcyon.nrl.navy.mil The flight of the HRTS-10 payload is scheduled for September 30, 1997 at 1930 UT. It will be preceeded by the EIT calibration rocket at 1900 UT. The HRTS payload includes a UV spectrograph, a UV spectroheliograph and an H alpha slit jaw system. The UV spectroheliograph will provide slit jaw images in 4 bands near 1550 A to image transition region, chromospheric and temperature minimum structures. The spectrograph slit is about 1 solar radius long. It will be position in the N-S direction near the central meridian with one end of the slit extending above the north solar pole. The slit will be rastered in the E-W direction in increments of 2" for a total width of about 10". The goal of this JOP is to understand the structure and dynamics of the quiet solar atmosphere. MDI will provide maps of the photospheric magnetic field and its evolution. The HRTS and SUMER instruments will provides maps of the intensity and velocity fields in the chromosphere and transition region and in the corona (SUMER). In particular, doppler signatures of explosive events will be searched for as they can be expected to be indicators of the locations of magnetic reconnection, as might occur in cancelling magnetic structures. CDS will provide maps of chromospheric, transition region and coronal structures. In particular, a number of density sensitive line ratios will be observed in order to understand energy densities and loss rates. Images in the 4 wavelength bands will provide the large scale topology of the transition region and corona. _____________________________________________________________________ MDI coordinator: Joe Covington MDI will execute a ve_fe_me set of high resolution observations starting 5-6 hours prior to the rocket flight and running until just after its completion. A CCD subfield of about 500(EW) by 1024 (NS) will be used with a cadence of about 1 minute. ---------------------------------------------------------------------- SUMER coordinator: Udo Schuehle TBD ---------------------------------------------------------------------- CDS: coordinator: Dominic Zarro A series of 240x240" rasters will be performed along the HRTS slit using primarily the NIS. Lines formed over a range of temperatures from O V 629 through Fe XVI 360 will be observed. This is a modification of program UVCS44W. ---------------------------------------------------------------------- EIT coordinator: Jeff Newmark A set of 4 images in the 4 wavelength channels will provide the large scale topology of the solar corona and transition region. In addition, a time series of 6x16 superpixel images in all 4 channels will be obtained. ---------------------------------------------------------------------- LASCO coordinator: Ken Dere A time sequence of Fe X images in C1 will be obtained to search for outflows from the polar holes.