Japan Agency for Marine-Earth Science and Technology (JAMSTEC) has been disseminated information of data and samples obtained by JAMSTEC’s research vessels and submersibles via some databases. The core database is the Data and Sample Research System for Whole Cruise Information (DARWIN, http://www.godac.jamstec.go.jp/darwin/e). DARWIN provides information of more than 2000 cruises and 6500 dives, and its related observation data and geological sample. Each cruise or dive information page of DARWIN has links to related contents such as biological sample, deep-sea image, cruise report and data book provided by another databases. In this poster, we will introduce some examples of efforts to improve the reusability of data and sample described above. - Assignment of Digital Object Identifier (DOI): DOIs have been assigned to more than 2000 research cruises information from the early 1980s onward to promote data citation. A granularity of DOI is a research cruise information page defined as a cruise ID at this time. - Specification of Data Policy: DARWIN has been treated data and samples based on only JAMSTEC data policy until FY2018’s research cruises. Currently, the applicable policy is dependent on type of cruise because the cooperative research cruises have been started since FY2019. DARWIN has been updated to display of an applicable policy on each information page clearly. The function is also available to add to another policy in the future. - Data Rescue: A cruise report is a prompt report that includes the purpose of the cruise, information about what kind of observation was done, how it was done and the results. Cruise reports for past research cruises have been found when moving laboratory and submitted to the Data Management Group. The reports have been scanned and saved as individual PDF to store for long-term and prepare for publication. A part of them with Principle Investigators’ consent have been disseminated step by step.

In this study, we try to explore the feasibility on whether or not the magnetospheric processes under northward Interplanetary Magnetic Field (IMF) conditions can be diagnosed using two different auroral phenomena; transpolar arc (TPA) and omega-band aurora. Both TPA and omega-band aurora can occur during the northward IMF intervals, and their appearances are closely related with the nightside magnetospheric processes. TPA can be formed and grown by the field-aligned currents induced by the plasma flow shear or the plasma vortex structures between the fast plasma flows generated by magnetotail magnetic reconnection and slower background magnetospheric flows, and the convection of the reconnection-formed closed magnetic fluxes, which cause in the nightside plasma sheet. On the other hand, the omega-band aurora can be attributed to the Kelvin-Helmholtz instabilities triggered by the flow shear between the plasma flows of the nightside magnetospheric boundary layer such as low-latitude boundary layer (LLBL) and background magnetospheric (plasma sheet) flows. If both auroral phenomena can simultaneously be observed, we might remotely investigate (diagnose) how the plasma and its energy are transported in the nightside magnetosphere and at the magnetospheric boundary region under northward IMF conditions. We will discuss the feasibility of this magnetospheric diagnosis, giving the observational example(s) of simultaneous observations of two different auroral phenomena, that is, TPA and omega-band aurora, and in-situ magnetospheric observation(s). Keyword: 1. Transpolar arc and omega band aurora 2. Solar wind-magnetotail-ionosphere coupling 3. Magnetospheric diagnosis 4. Magnetospheric dynamics under northward IMF conditions