HOP 0036

HINODE Operation Plan (HOP)

accepted on

15-Aug-2007

HOP No.

HOP title

HOP 0036

Coronal heating; Simultaneous observations with EIS on board Hinode and Norikura Coronagraph

abstract of observational proposal

Scientific Objective

(i) Delineate the variation of temperature and non-thermal velocity in coronal loop as a function of height above the limb.

(II). Answer to the increase in FWHM of [Fe X] 637.4 nm emission line with height above the limb and unexpected decrease in the FWHM of [Fe XIV] 530.3 nm emission line with height.

(III). Existing RTV and similar models for coronal loops do not explain the observed variations of the FWHM and intensity ratios of coronal emission lines with height above the limb. After making simultaneous observations in 4 coronal emission lines in the visible wavelength regions and with EIS on board Hinode in the EUV range; a new realistic model of coronal loops may be proposed.

(IV). Physical and dynamics characteristics of coronal loops is likely to understood.

(v). We shall be able to study the development of active regions and mechanism involved in the triggering of solar flares

request to EIS

Observations with EIS on board Hinode:
(i) SLOT images of the active region from center of the sun to west limb in [Fe x] 190.04 A, [Fe xii] 195.12 A, [Fe xiii] 202.04 A, and [Fe xv] 284.16 A coronal emission line
(ii) Raster scan of the active region using slit in the above mentioned emission lines up to a height of 200 arcsec. Slit will be kept parallel to the solar limb when active the reaches close to the solar limb for about 3 to 4 days.

other participating instruments

Observations with Norikura 25-cm coronagraph:
(i) Off the limb, raster scans of the active region will be made in [Fe xi] 7892 A, [Fe xiii] 10747 A and 10798 A and [Fe xiv] 5303 A coronal emission lines simultaneously using a slit of 4 x 500 arc sec size. The raster scan will be repeated during the whole day of observations to study the dynamic behavior of coronal loops.