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HINODE Operation Plan (HOP)

accepted on


 HOP No.

 HOP title

HOP 0360

Coordinated Observation for the FOXSI-3 rocket experiment

plan term




 name : Glesener    e-mail : glesener[at]umn.edu

contact person in HINODE team

 name : DeLuca, Reeves    e-mail : edeluca[at]cfa.harvard.edu, kreeves[at]cfa.harvard.edu

 abstract of observational proposal
Main Objective:
Measure flare-temperature plasma and/or accelerated electron distribution in the quiescent corona.

Scientific Justification:
The proposed observations are in support of the upcoming launch of NASA’s FOXSI (Focusing Optics X-ray Solar Imager) sounding rocket. FOXSI will provide hard X-ray imaging observations in the 5-20 keV range at a 50 times improved sensitivity compared to RHESSI. This will allow us to investigate the low-level hard X-ray emission that is predicted in some coronal heating scenarios, and/or by nanoflares. The launch date is August 21, 2018. During the 6-minute FOXSI flight, an active region (if available) and the quiet Sun will be observed. The FOXSI field-of-few is 16x16 arcmin.

Coronal heating is one of the main unsolved problems in Heliophysics. Low-level energy releases at high occurrence rates (so-called nanoflares) are one of the proposed mechanisms to heat the corona. Results from the previous FOXSI-2 rocket flight included a direct observation of 10 MK plasma in a quiescent region (Ishikawa et al. 2017; Nature Astronomy). We aim for a second measurement of such plasma in our third flight, with an upgraded instrument including a photon-counting soft X-ray imager. For the quiet Sun, we will measure or set new upper limits on the hard X-rays produced by hot plasma and/or accelerated electrons.

 request to SOT
Context magnetograms from SOT are preferred but not required.

 request to XRT
AR observations: Similar or equal run as Schmelz et al.; run to be performed before the FOXSI launch and after (preferably repeated a few times to get an idea on the long-term time evolution).

QS observations: adaptation of polar region run

 request to EIS
The FOXSI team will decide which one is most appropriate to run.

HIC_SCAN_58X512V1 (original from 2012 flight)
・58 x 512 arcsec
・ 3 arcsec steps
・15 s exposures

HIC2_SCAN_61X512 (a finer scan with expanded linelist)
・61 x 512 arcsec
・ 2 arcsec steps
・15s exposures

HIC2_SCAN_201X512 (a wider coarse scan with expanded linelist)
・201 x 512 arcsec
・10 arcsec steps
・15s exposures

 other participating instruments
We plan to request IRIS coverage.

Dates: FOXSI-3 launch = 9/7, Window = 17:15 - 18:10 UT
;;The FOXSI-3 flight is scheduled for August 21, 2018 and will occur on that day
;;unless unanticipated delays (including high-altitude winds) occur.

Time window: The FOXSI-3 observation time will be 6 minutes within a 1-hour launch window. The launch window is requested to the launch range (either 17:18 to 18:18 UTC or 20:25 to 21:25 UTC) but is not yet confirmed. We request Hinode coverage from approximately 16:00 UT to 22:00 UT in order to include observations before and after the flight.

Target(s) of interest: The primary target will be an active region if one is available on the Sun on August 21. Other targets include quiet regions, which could include a polar region and/or regions with X-ray bright points.

HOP 0221 was run for the previous two FOXSI flights, with P.I. Sam Krucker.

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