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HINODE Operation Plan (HOP)

accepted on


 HOP No.

 HOP title

HOP 0047

SUMER campaign - Moss Observation

plan term


@ @


 name : S. Patsourakos @  e-mail : spatsourakos[at]ssd5.nrl.navy.mil

contact person in HINODE team

 name : J. L. Culhane @  e-mail : jlc[at]mssl.ucl.ac.uk

 abstract of observational proposal
Scientific Justification :

AR moss is believed to correspond tothe ~ 1 MK footpoints of hot (>3 MK)
SXR loops and represents a sensitive monitor of coronal heating and conditions. Coronal loop models can run under certain circumstances into trouble  when  trying to reproduce the moss in that the predicted intensities are much larger than what is observed. Absorption of moss emission by cool and dense spicule plasma is a proposed mechanism for bringing observations and modeling into a better agreement.

Objective :

If absorption is indeed important then it would  only affect lines formed below the  head of the hydrogen Lyman continuum at 912A which can be absorbed  by neutral hydrogen (and probably also below 504 A and 228 A due to absorption by neutral  and singly ionized helium respectively) and not lines formed above 912 A. We plan to investigate  this  possibility  by co-temporal and co-spatial EIS
and SUMER moss observations in Fe XII lines at ~ 195 A (EIS) and 1242 A (SUMER).

Moreover, given we will observe lines from the same ion with both EIS and SUMER with the latter also supplying observations in several chromospheric lines which would allow to determine absolute velocities for both instruments.

 request to SOT
BFI:   G-band, Ca H-line
        105x105" FOV, 2x2 summed
NFI:   1. H-alpha -300mA blue wing filtergrams
         2. Fe I 6301.5 magnetograms
         160x160" FOV, 2x2 summed
SP:     Fast Map, 50" scan over the AR, repeat every 30 minutes

Programs 1 & 2 in the NFI can't be run at the same time so we'd run
H-alpha for 2 hours and then switch to the Fe I magnetograms for
another 2 hours. A cadence of 10 - 30 s for the BFI and NFI
filtegrams would be adequate.

 request to XRT
Observations of the target AR  in the Al-poly,
Ti-poly and Be-thin filters. A FOV of 512x512 pixels
and a cadence of 30 s would be adequate.

 request to EIS
Run the following studies :

GAD001_AR_rast: 256x256 arcsec**2 - exposure time 15 s - total
duration   ~ 1 hour
JAK_256_AR_STUDY: 256x256 arcsec**2 - exposure time 30 s -  total
duration ~ 2 hours
GAD004_AR_slot15_SAS: 40 arcsec slot  - total duration ~ 10 min - run 3

Using the short exposure raster will prevent potential saturation
in Fe XII in bright moss regions while the long exposure raster
will mostly highlight dimmer loop emissions.
Finally, taking a series of 40" slot images, which should be
spectrally pure  in  Fe XII, would  allow to study the temporal evolution
of the  moss observed by EIS & SUMER.

 other participating instruments

SUMER observations in the 1240-1260 A range
are requested. Spectral windows  centered at the
following lines would be downloaded :

Fe XII  (1242.03)
N V     (1242.77)
Mg  X   (2 x 625)
O V     (2 x 629)

Moreover. 1-2 windows containing
C I lines (1244.53,1245.94)
close to Fe XII, to supply
wavelength reference for this line,
will be also  downloaded.

The 0.3x120 arcsec**2  slit will be used
to cover both moss and coronal parts
of the target AR. The main goal is to
get usable spectra in the not particularly strong Fe XII
line. Therefore, at each slit location 3 30 s exposures
will be taken, to avoid possible saturation in the strong N V
line. We envisage taking ~ 150 steps of the slit, covering
a FOV of 150x120 arcsec**2 in ~ 3.5 hours, which would
cover a typical  AR. If the target AR is smaller,
smaller rasters could  be build.
After the raster has been built, an additional 30 minutes
of sit-and-stare observations over moss areas
will be taken using the settings of the raster observations.


Full FOV high cadence (~ 1 minute) and low compression 304 & 171

We have been alloctated SUMER time for Nov  08 starting at 05:00 UT and Nov 14 starting at 14:00 UT


An AR close to disk center. The AR should show some evidence  of hot SXR lines in its core as judged by XRT images. The FOV of the raster images should attempt to contain both polarities of the target AR, while the sit andb stare observations would contain moss regions. Total duration of the proposed study is ~ 4 hours. If a disk AR is not present during the allocated time observe a quiet Sun region near disk center.

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