HOP list   Monthly Events

HINODE Operation Plan (HOP)

accepted on

21-dec-2017


 HOP No.

 HOP title

HOP 0348

Collaboration with NuSTAR: Hard X-rays across the solar cycle

plan term

ToO

@ @

proposer

 name : Hudson @  e-mail : hhudson[at]ssl.berkeley.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: The goals of this HOP is to characterize the X-ray emission from the Sun during solar minimum

Scientific Justification: The Sun currently is entering its minimum period of activity, and we expect the absolute minimum to occur in about 2019. The key to this program is to obtain frequent glimpses of the global X-ray corona, via fulldisk images with XRT and one-orbit mosaic maps of the Sun with NuSTAR at times of no (or minimal) solar ghost-ray background. During solar minimum, the shear zones of the solar torsional oscillations, which relate globally to magnetic flux emergence, will jump from low latitudes to high latitudes according to the well-established Babcock-Leighton pattern. The NuSTAR observations can relate this to global coronal temperaturevariations at for the first time. XRT will provide important context for these observations. In addition to thermal emission processes we also note the possibility of non-thermal signatures associated with coronal heating (e.g., nanoflares) or with cosmic-ray secondary products.

 request to SOT
None

 request to XRT
CME Watch program with Al-poly and Thin-Be, no slower than 1 min cadence (can reduce to Thin-Be filter only to preserve cadence)

 request to EIS
None

 other participating instruments
NuSTAR

 remarks
Dates: We have proposed for a NuSTAR map every three months, starting immediately and ending when the new solar cycle picks up again. Based on the previous solar minimum, the optimum time range for this program would be 2017.8 through 2020.9.

Time window: Time window matching with NuSTAR solar orbits
Target(s) of interest: Quiet Sun

HOP list   Monthly Events