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HINODE Operation Plan (HOP)

accepted on


 HOP No.

 HOP title

HOP 0238

Coordinated Hinode/EIS and ground based observations of the total solar eclipse of 3 November 2013

plan term


@ @


 name : Landi, Habbal @  e-mail : elandi[at]umich.edu

contact person in HINODE team

 name : Landi
@  e-mail : elandi[at]umich.edu

 abstract of observational proposal
The total eclipse taking place on 2013 November 3 (at around 14:25 UT) will be observed from the ground with a suite of filters designed to isolate and measure the intensity of visible lines from selected key ions like Fe X, XI, XIII and XIV between 5000 A to 11000 A. As the field of view of the observation extends from the limb up to 4 solar radii, these measurements will provide a unique window on the physical properties of the extended solar corona, providing us with AIA-like 2D images of the solar corona, which hold the additional advantages over AIA of 1) better spectral/temperature purity and 2) 10 times larger effective field of view.

Emission lines in the visible are formed by radiative scattering of disk emission starting from approximately 1.1 Rsun. The combination of visible spectral lines with 1) collisionally dominated EUV coronal lines from EIS and 2) visible observations of the background continuum will allow us to apply unique spectroscopic diagnostic techniques that will provide:

1 - The first ever empirical determination of fast and slow solar wind freeze-in heights for Fe;

2 - The empirical determination of the frozen-in Fe charge state composition to be directly compared with in-situ data;

3 - An empirical model of the fast and slow wind velocity, electron temperature and electron density profiles from the limb to the freeze-in region using the novel technique developed by Landi et al. 2012 (ApJ, 750, 159)

4 - Large scale distributions of plasma parameters (electron density, temperature and filling factor) in streamers and coronal holes.
COMP observations of the Fe XIII 10747 and 10800 line pair will allowthe determination of the electron density below 1.5 solar radii to be compared with Hinode/EIS determinations, as well as cross-calibration between EIS, COMP and the eclipse observations.

We propose supporting observations from Hinode/EIS and Hinode/XRT during the eclipse, and for a few hours before and after the eclipse on 2013 November 3. The targets will be slowly evolving large-scale coronal  structures (active region, streamer and coronal holes) before and after the eclipse.

During the eclipse we would like to observe a prominence cavity at the limb, which will allow us to easily co-align EIS observations with eclipse images. In the absence of a cavity, we will observe an active region at the limb.

 request to SOT

 request to XRT
XRT will collaborate with both the Pasachoff group and the Habbal group.  The requested observations are as follows:

Pasachoff (totality @ 13:56 UT)

Full-frame Al-poly images, binned 4x4 (similar to XRT CME-watch programs), with a cadence of at least 5 minutes

Habbal (totality @ 14:25 UT)

Al-poly, Ti-Poly and Thin-Be images, 768"x768" field of view, binned 2x2 (similar to XRT Coronal Cavity programs).  A slow cadence is fine.  Preferred target: coronal cavity.  Secondary target: active region at the limb.  XRT observations should be off-pointed from the limb by reading out an off-center portion of the CCD.  Care should be taken that the XRT observations still overlap the EIS observations.

Since both groups have requested observations before and after totality in their location, XRT will run a program that combines both these requests, with a pointing centered on the Habbal target.  Note that Hinode will see a partial eclipse covering the west limb from 14:04 to 14:19, so the target should be on the east limb.

XRT would also like to request a disk center pointing for the second eclipse, from ~11:20 - ~11:35 UT, so that we can make a nice eclipse movie.

XRT REQUEST (Landi & Habbal)
Time series of images at the solar limb
TARGET: same as EIS
FIELD OF VIEW: 512x512 (384x384 acceptable)
EXPOSURE TIME: Long exposure time (AEC setting = 2)
FILTERS: Al/poly, Ti/poly and Thin-Be
CADENCE: It can be slow, we are not looking for sudden events
Simultaneous observations with EIS

 request to EIS
EIS REQUEST  (raster size with JPEG90 compression)

If a cavity is available (PCH=Polar Coronal Hole):
Program                Target             Timing        Size(Mb)   Duration
dhb_polar_scan         Streamer/PCH     Before eclipse   383.0     3h 46m
gdz_plume1_2_300_50s   cavity           During eclipse   165.0     1h  8m
Total                                                    548.0     5h 54m

If no cavity is available:

Program                Target             Timing        Size(Mb)   Duration
dhb_polar_scan         Streamer/AR      Bef/dur eclipse  383.0     3h 46m
landi_scan_ch          coronal hole     After ecipse     190.0     2h  7m
Total                                                    573.0     5h 53m

Simultaneous observations with XRT

 other participating instruments

Pointing (XRT): Disk center pointing for the second eclipse, from ~11:20 - ~11:35 UT

Pasachoff (totality @ 13:56 UT)
Habbal (totality @ 14:25 UT)

POINTING: We would like to have EIS and XRT observing at the solar limb. The
pointing can be easily achieved having SOT pointing on the disk within 15-20 arcsec from the limb, and using the EIS fine mirror mechanism to point at the targets.


During the eclipse: Cavity (if available - PRIMARY target)
                   Limb active region (if cavity unavailable - BACKUP target)

Before and after the eclipse: polar coronal hole/streamer boundary (if available)
                   streamer (if polar holes are not available)

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