HOP list   Monthly Events

HINODE Operation Plan (HOP)

accepted on

23-apr-2015


 HOP No.

 HOP title

HOP 0285

Multi-height helioseismology of quiet-Sun and active regions.  Coordinated observations with VTT

plan term

2015/05/23-2015/06/04

@ @

proposer

 name : Wisniewska, Wisniewska @  e-mail : aneta.wisniewska[at]kis.uni-freiburg.de

contact person in HINODE team

 name : Savage @  e-mail : sabrina.savage[at]nasa.gov

 abstract of observational proposal
The main goal of observing proposal it to plan coordinated multi-wavelengths observations between the IRIS and Hinode space observations, and the Vacuum-Tower &#8211;Telescope (VTT) located at the Teide Observatory in Canary Islands. Combined measurement between the space IRIS and Hinode, and the recently developed 2D Fabry-Perot HELLRIDE instrument installed at VTT will allow us to obtain the high cadence (<60 sec) multi-height imaging observations of solar oscillations from the photospheric level to the corona of the quiet-Sun and active region. The HELLRIDE data provide unique Doppler shifts information simultaneously in 16 bands in and above the photosphere level. This kind of observations will help to understand the propagation of the acoustic waves through the solar atmosphere. The proposed VTT-IRIS-Hinode joined measurements will be the second observing campaign using the HELLRIDE for a thesis work of A.Wisniewska (KIS, Freiburg) focusing on the topic: eAnalysis of kinematic energy transfers within the solar atmosphere at high temporal and spatial resolutionf.

The observing program would involve at least 10 spectral lines observed simultaneously at medium cadence (30 - 60 sec). FOV instrument is 100 by 100 arc sec and measured with 1k by1k camera. By the image size 512x 512 pixels we obtain the spatial resolution of 0.2 arc sec/pixel. Observations would cover 10 hours each on multiple days to achieve best signal-to-noise performance and to compensate for statistical fluctuations in wave excitation with time. We would make use of the capability of HELLRIDE to switch between wavelength bands at high speed. The range of the spectral lines will cover the photosphere with (Fe I 6173 A) up to the lower chromosphere (H alpha 6562 A). The 10 spectral lines will be selected in such a way to probe the solar atmosphere with the intervals of about 300 km.
Therefore we would like to complement out measurement with the Hinode, and IRIS data covering the higher regions of the solar chromosphere, with possible higher cadence. Observations would ideally cover 10 hours each on multiple days to achieve best signal-to-noise performance and to compensate for statistical fluctuations in wave excitation with time. We would make use of the capability of HELLRIDE to switch between wavelength bands at high speed making use of the HELLRIDE property of observing large numbers of spectral lines. The program is planned for observations at the disk center. The target of measurement will be a quiet-Sun region, and an active region (including plage, pore or sunspot).

 request to SOT
BFI (CaII H)    56" x 112"  /60sec
BFI (G-Band)    56" x 112"  /60sec
NFI (NaI IV)    82" x 82"   /60sec

 request to XRT
512"x512"/30sec

 request to EIS

 other participating instruments
IRIS: gSit-and-stareh SJI the maximal FOV of an instrument 175 x 175 arc sec.  The temporal cadence of the measurement should be not smaller than 10 sec and not larger then 30 sec

Spectral lines: SJI imaging data taken for the chromosphere simultaneously. (Mg II H 2803A and Mg II  K 2796 A) and transition region (C II  1334/1335A and Si IV 1394/1403A) and one context photospheric pass band (2830 A)

 remarks
ETime period of proposed observations, if required.
Provide the start and end dates with the reason.
The VTT/HELLRIDE observational campaign is planed between 23.05.2015 till the 04.06.2015. In that time we will be able to make the measurement of QS and active regions (near the disc center).
&#9702; Provide the minimum number of observation days during the period.
The ground-based observations may be affected by the weather conditions, which are unexpected. Therefore we would like to request in the given period of time 3 days of observations of quiet-Sun regions and 3 days for active region observations. These observations do not have to be on consecutive days.

E Time window in day, if required.
Provide the "minimum" duration with the start and end times in UT, if it is a coordinated observation with ground-based or space-based observatories.
Both the ground and space-based observations should start at 9.00 UT and end in 19.00 UT. For the helioseismological analysis we need long time series of data. The minimum duration is 4 hours.
Specify whether any short interruptions (e.g., for ten-minute synoptics) are allowed over the observing periods.
Because of specific observations there should be no interruptions due to the measurement, or these should be reduced to minimal.

E Target of interest.
Quiet-sun and active region including pore or sunspot near the disk center.

HOP list   Monthly Events