HOP list   Monthly Events

HINODE Operation Plan (HOP)

accepted on


 HOP No.

 HOP title

HOP 0341

Hinode-IRIS coordinated observations of MHD waves in plage regions at various places on the solar disk

plan term


@ @


 name : Abe, Shimizu @  e-mail : abe.masashi[at]ac.jaxa.jp, shimizu.toshifumi[at]isas.jaxa.jp

contact person in HINODE team

 name : Watanabe @  e-mail : watanabe[at]uvlab.mtk.nao.ac.jp

 abstract of observational proposal
Main Objective: Statistical investigations on propagating MHD waves in plage regions with Hinode-IRIS coordinated high-cadence observations from several different view angles.

Scientific Justification: MHD waves have been considered to play a key role in heating of the upper solar atmosphere, because they may be thought to transfer the energy from photosphere to the upper solar atmosphere. It is important to observationally estimate the energy flux by MHD waves, and thus it is necessary to identify the mode of waves in order to estimate the energy flux. By using Hinode SOT-SP, we can detect MHD waves and identify the mode of waves at the photosphere. Fujimura & Tsuneta (2009) observed waves in plage regions by using SOT-SP, and found slow sausage mode and kink mode waves dominantly. They found sausage mode mainly near the disk center, whereas kink mode may be more frequently observed at the regions far from the disk center. They commented that kink mode were more easily seen closer to the limb. However, the number of the samples is extremely limited, and they studied MHD waves only in the regions whose view angles are less than 53 degree. Therefore, the regions that are closer to the limb should be observed more frequently. By performing simultaneous high-cadence observations with Hinode SOT/SP and IRIS satellites, we study the behaviors of MHD waves observed at two different atmospheric layers and also estimate the energy flux of the waves at the two layers. From the difference between the energy flux in these layers, we can estimate the energy that is dissipated between the layers. Kanoh et al. (2016) performed observations of a sunspot simultaneously with Hinode SOT/SP and IRIS satellites. They identified the mode of observed waves, estimated the energy flux at the photosphere with SOT-SP and estimated energy flux at a lower transition region with IRIS. As a result, they found that the sufficient energy is dissipated to heat chromosphere in the sunspot. In other regions (e.g. plage and Quiet Sun network), simultaneous observations by Hinode SOT/SP and IRIS satellites are also needed to evaluate the importance of waves in heating of the upper atmosphere. High temporal resolution is required to identify the mode of waves with higher confidence, because the periods of waves in chromosphere are mainly a few minutes. However, High temporal resolution observations coordinated between Hinode/SP and IRIS for wave studies are extremely limited. For these reasons, we would like to perform simultaneous observations coordinated between Hinode SOT/SP and IRIS. High time resolution (less than 30s) is required to observations of the two instruments. The SP scanning field of view is very narrow (3h), which shall be overlapped with the field of view of IRIS observations. For statistical studies, we need to collect samples as much as possible (ten to twenty samples at the minimum) not only at the central region on the solar disk but also at the regions close to the solar limb. Ten to twenty samples of observations should be required for statistical studies.

 request to SOT
Please refer to the parameters of a simultaneous SP-IRIS observation carried out on February 12, 2015. FOV: 3h~82h Cadence should be less than 30s.

Slit position: 10 Exposure time: 1.6s Repeat: ON Delta step: 2

CCD: single side Table 0 (512 pixels high) Scaling: I only x: not summed, y: summed

SOT should also take a Fast Map to aid in coalignment, with a larger FOV centered on the same pointing, either before or after the time series:  30"x82" would be enough.

 request to XRT
High cadence obs (~10s) with 384x384 fov, single filter
Please disable FLD if it is safe to do so, otherwise reduce cadence of flare patrol images to 80 sec.

 request to EIS
Please advise us, if you have some suggestions about a use of EIS.

 other participating instruments
IRIS Requests:
3600254030 | Large sparse 8-step raster 7x120 8s Deep x 2 FUV spectrally rebinne | 27.23 | 113.63 | 2.8 | 3.4+/-0.1 | 27.2+/-0.0 | 13.7+/-0.1 | 13.6+/-0.1 | 13.6+/-0.1 | 13.6+/-0.1

Previous HOP information: None

Additional Remarks:
The minimum duration of each observation is one hour. Ten to twenty observations are required for statistical investigation. This data will be used as a part of the proposerfs Master thesis.

HOP list   Monthly Events