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HINODE Operation Plan (HOP)

accepted on


 HOP No.

 HOP title

HOP 0214

Coordinated Observations Between the Extreme Ultraviolet Normal Incidence Spectrograph (EUNIS) Sounding Rocket and EIS

plan term


@ @


 name : Brosius, Rabin, Daw, Wang, Landi @  e-mail : jeffrey.w.brosius[at]nasa.gov

contact person in HINODE team

 name : Young @  e-mail : pyoung[at]ssd5.nrl.navy.mil

 abstract of observational proposal
INTRODUCTION:  The Extreme Ultraviolet Normal Incidence Spectrograph (EUNIS) sounding rocket instrument investigates energetics of the solar corona and acceleration of the solar wind using high-resolution EUV spectroscopy of unprecedented sensitivity.  Rapid cadence (1 s) is enabled by the instrument's high throughput (effective area more than 100 times greater than its SERTS predecessor) and the use of high-speed Active Pixel Sensors.  Its two co-aligned multilayer telescope/spectrographs cover spectral ranges 30.0-37.0 nm and 52.4-63.0 nm with 2-arcsec slits that cover lengths of 11 arcmin, nearly a full solar radius.  The instrument was used to verify the EIS radiometric calibration during its last flight in 2007 (Wang et al. 2011, ApJS 197, 32) and will again be radiometrically calibrated such that a similar verification can be performed with data from the flight in August 2012.

SCIENCE OBJECTIVES:  EUNIS is presently scheduled to launch in the week beginning September, 24th, 2012, with a launch time likely around 17:00 UT - 17:30 UT.  Our primary science objective is to investigate rapid solar variability in active region(s) and quiet areas.  This will be achieved with a sequence of fast EUNIS rasters in which the slit pointings will scan back and forth continuously within maximum displacements of 20-30 arcsec to either side of the initial slit pointing.  The coordinated EUNIS and EIS observations will provide extensive spectral (17.0-20.5, 25.0-29.0, 30.0-37.0, and 52.4-63.0 nm) and very wide temperature (0.1-20 MK) coverage.  A secondary science objective is to cross calibrate with EIS on Hinode.  This will be achieved indirectly for both EIS wavebands (17.0-20.5 nm and 25.0-29.0 nm) by comparing density- and temperature-insensitive line intensity ratios with theoretical values derived from CHIANTI.  The key to the "indirect" cross calibration is that each line pair will include one member from EIS and one member from EUNIS.

 request to SOT
Hinode's SOT will reveal whether the EUV and X-ray intensity variations are associated with emerging flux, converging flux, disappearing flux, or some other magnetic phenomenon.

 request to XRT
Coordinated AIA images from SDO will enable us to derive precise pointing information for EUNIS; AIA and coordinated XRT images from Hinode will reveal areas of rapid variability.

 request to EIS
Previously we defined the EIS study "EUNIS_EIS_CrossCal" based on our intent to cross calibrate EIS with EUNIS over a wide wavelength range within a large enough area to achieve coordinated observations over a variety of active and quiet features.  We selected DCPM (lossless) compression and a slit height of 240" in order to keep the data rate slightly below 50 kBits/s.  We selected the 2-arcsec slit to maintain a slit width and spatial resolution closer to that of EUNIS, and to speed up the raster time. For sixty-one (raster area 122"x20") 50 s (appropriate for active region and quiet Sun areas) exposures the total duration is 55m22s.  We include the "core lines" in our line list, as well as most of the EIS spectral range from 17.2-20.6 nm.  We selected 17 smaller wavelength bins in the 25.0-29.0 nm range, from Fe XVI at 25.107 nm to Fe XV at 28.416 nm, to cover that range fairly thoroughly.

 other participating instruments
We will also request coordinated observations with SOHO's CDS (likely NIS4W/v62). As with the previous EUNIS and EIS coordinatedobservations, we will request three EIS rasters with EUNIS_EIS_CrossCal: one before the EUNIS launch window, one during the launch window, and one after the launch window, depending upon Hinode's expected passage through SAA as well as the duration of the EUNIS launch window.

šthe current launch time is 18:30 UT 15 Dec.

The official launch window is 11:00 to 11:30 local time, which is 17:00 to 17:30 UT. If the launch date slips a week or two, the window will change little if at all.

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