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HINODE Operation Plan (HOP)

accepted on


 HOP No.

 HOP title

HOP 0292

Multi-wavelength observations of small brightening events in the chromosphere-TR-corona and their magnetic properties

plan term


@ @


 name : Kanoh @  e-mail : kanoh.ryuichi[at]ac.jaxa.jp

contact person in HINODE team

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

 abstract of observational proposal
Small-scale transient brightenings occur frequently in the solar atmosphere. Shimizu (1995)fs research with Yohkoh Soft X-ray Telescope shows that the frequency distribution of microflares are represented by a power-law function and their total energy, assuming that the power-law continues to lower energy, is smaller than the heating rate required for the active-region corona. However, much smaller energy release events, such as UV transient brightenings, explosive events and blinkers, have been observed in UV with higher occurrence rate (Aschwanden et al. 2000 for a frequency distribution plot of these events).. Therefore, We need to evaluate the energy and frequency of these events with multi-wavelength observations that provide properties of plasma in chromospheric, transition region and coronal temperatures.

Quantitative high-cadence measurements of magnetic fields are also crucial to understand physical mechanisms on driving these small events. The combination of Hinodefs SOT, EIS and XRT makes it possible to investigate the driving mechanisms as well as their coronal and chromospheric responses. Further, IRIS gives us not only high-resolution spectra which are sensitive to the transition-region temperature plasma, but also Mg II triplet lines, which is sensitive to the releatively cool plasma (Pereira et al 2015) and useful for diagnosing the small-scale brightenings.

This proposal is to coordinate Hinode's three telescopes with IRIS for acquiring simultaneous datasets suitable for studying small brightening events.. Note that the data will be used in the proposer's Master-thesis studies.

 request to SOT
map (1cycle exposure, 2x2 summed)
18hx 60.9h (124 slitpos and 2.5 min cadence)
Q=65, 1-side CCD

II H: 18.7hx74.6h, 2x2 summed, Q=65, 80ms exposure, 32sec cadence
G-band: 18.7hx74.6h, 2x2 summed, Q=65, 80ms exposure, 32sec cadence
Na D Sh-less IV +140m: 30.7hx81.9h, 2x2 summed, Q=65 for I and 95 for QUV, 8cycles exposure, 32sec cadence

SOT total data volume is about 0.75Gbits per an hour.

 request to XRT
FILTER: Al-poly/open, thin-Be/open, open/Al-mesh and several G-band images for coalignment
FOV: 128hx128h
CADENCE: 60sec

 request to EIS
Study ID: 134
Raster ID: 111
Raster type: Scanning
Number of pointing positions: 20
Scan step size: 2h
Window height: 120h

Exposure times: 10000ms
Number of window: 21
OIV 184.10, Fe VII 185.21, Fe XI 188.23, Ca XVII 192.82, Fe XII 195.12, Fe XIII 203.83, O V 248.46, He II 256.32, Si X
258.37, Si X 261.04, Fe XVI 262.98, Fe XXIII 263.76, Fe XIV 264.78, Mg VI 269.17, Fe XIV 274.20, Si VII 275.35, Mg V
276.57, Mg VII 278.39, Mg VII 280.75, Fe XV 284.16
EIS total data volume is about 0.2Gbits per an hour.

 other participating instruments
raster type: Large sparse 16-step raster (FOV:15hx120h)
SJI choices: C II, Si IV, Mg II h/k, Mg II w
Exposure times: 1 sec exposure
Summing modes: Spatial x 2 Spectral x 2
FUV summing modes: FUV spectrally rebinned x 4
SJI cadence: SJI cadence ~ 10s
Compression choices: Default compression
Linelists: Large Linelist
Slit orientation: No rotation
OBSID: 3800600036

-Target of interest-
1. Active regions with emerging activeties
2.Moat region of a well-developed sunspot
Targets should be located <+/- 30 deg in heliocentric coordinate.
EList of past HOPs in which the present proposer was the PI IHOP271
A run was performed very recently (on June 18th). The proper recently started to analyze the data and will present the results in the M-thesis and other opportunities.

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