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HINODE Operation Plan (HOP)

accepted on


 HOP No.

 HOP title

HOP 0097

CORE: Nanoflaring activities in the Quiet Sun

plan term




 name : Shimizu, Grigis    e-mail : pgrigis[at]cfa.harvard.edu

contact person in HINODE team

 name : Shimizu    e-mail : shimizu.toshifumi[at]isas.jaxa.jp

 abstract of observational proposal
・For understanding the heating of the solar atmosphere, it is important to observationally understand the (spatial and temporal) relationship of small scale dynamics observed at different atmospheric layers in the Quiet Sun.

・XRT high-cadence movie observations have revealed that the Quiet corona is full of dynamics, including tiny transient events (possibly nanoflares) with a few arcsec in diameter.

・What is observed as the counterpart of such tiny events in the lower atmosphere? This is the primary question to be addressed with this observation.

・SOT CaIIH movie observations have revealed ubiquitous magnetic reconnection events in the chromosphere (e.g., Shibata et al. 2007), which may generate a small amount of high temperature plasma detectable with XRT and EIS.

・Also, CaIIH high cadence movie has a potential to reveal the existence of non-thermal electron beams accelerated by the nanoflares. For example, the CaIIH high resolution movie of microflares (in order of 10^27 ergs) clearly shows the transient behavior of bright kernels (with the size of less than 0.5 arcsec) at the footpoints of brightening coronal loops (Shimizu et al. 2007, 1st Hinode meeting), which can be interpreted as the observational signature of electron beams impinging to the chromosphere.

・Magnetic field configuration and its temporal evolution below the nanoflaring sites is the secondary target to be addressed from this observation.

 request to SOT
SOT CaIIH high cadence (chromospheric signature) and magneticfield observation is the core observation.

・Because of telemetry bandwidth limit, the following order is given to the priority. Will adjust the sequence, depending on the allowable telemetry.
1. Highest priority - CaIIH high-cadence images

・FOV 55”x55” (1K x 1K, 1x1 summing)
・Cadence: 20 sec (216Mbits/hr) or 10 sec (432 Mbits/hr)

2. Highest priority - NFI NaID Stokes I/V
・FOV 84”x84” (512 x 512, 2x2 summing)
・Cadence: 5 min (14Mbits/hr)

3. Second priority - SP fast map
・FOV 84”x84”, 15 min for a mapping
・Cadence: 1 hours (77Mbits/hr)
・Telemetry estimate: 309Mbits/hr (for 20 sec cadence)
・When about half of the 1 day memory allocation is provided to this observation, this sequence can be performed for about 6 hours per day.
・~1800 Mbits for 6 hours
・Run the continuous sequence as long as possible, in order to catch several number of events.

 request to XRT
・High cadence exposures (25 sec cadence) is required with a single filter for identifying occurrence of tiny nanoflaring activitivities
- Filter: Al/poly, 23 sec exposure time
- Field of view 192“ (EW) x 192“ (NS), Unbinned, which still covers the entire SOT field of view.
  * Note: XRT – SOT/BFI offset (EW, NS)= (-40”, -27”)
- Compression: Q98 (3.8bits/pix) [option: Q95 (2.6bits/pix)]
・Full FOV G-band image (containing the limb in FOV) for accurate co-alignment with SOT
- Frame: 1Kx1K (2Kx2K, 2x2 summing)
- Cadence: once every one hour
- Compression: Q98 (4.5bits/pix), same as the Q factor used in coalignment run
・Telemetry estimate 17.7Mbits/hour (for 192”x192”, Q95) 23.5 Mbits/hour (for 192”x192”, Q98)

 request to EIS
・To capture dynamics at TR and low coronal temperatures.
・Following advice by an EIS expert, Dr. Kamio, the following study is considered as the primary plan.
         Study 250 sta_loop_slot_lo
         FOV 40"x248"
         Exposure 20sec
         Cadence 20sec
      Estimated data -  270MBits / 6 hours

 other participating instruments

Some days in middle January (from 16 January, Fri to 22 January, Thr), during when Shimizu is SOT Chief Observer.

・Two targets of the Quiet Sun
1. Quiet Sun near the disk center
2. Quiet Sun near the limb (70-80deg off)
・Final target is determined in the daily meeting on the OP upload day.
・XBPs may be included in the target FOV.
・No active active regions are preferred for protecting XRT.
・SAA free period (10-16UT) should be used for this continuous run.

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