• Search Research Projects
  • Search Researchers
  • How to Use
  1. Back to previous page

Observations of Temporal Fine Structures in Solar Millimeterwave Bursts

Research Project

Project/Area Number 02640208
Research Category

Grant-in-Aid for General Scientific Research (C)

Allocation TypeSingle-year Grants
Research Field Astronomy
Research InstitutionNational Astronomical Observatory

Principal Investigator

NAKAJIMA Hiroshi  NAO Division of Radio Astronomy, 電波天文学研究系, 助教授 (40012877)

Co-Investigator(Kenkyū-buntansha) KAWASHIMA Susumu  NAO Solar Radio Observatory, 野辺山太陽電波観測所, 助手 (40234059)
SEKIGUCHI Hideaki  NAO Solar Radio Observatory, 野辺山太陽電波観測所, 助手 (40154645)
SAWA Masaki  NAO Division of Radio Astronomy, 電波天文学研究系, 助手 (10154139)
SHIOMI Yasuhiko  NAO Division of Radio Astronomy, 電波天文学研究系, 助手 (00134627)
SHIBASAKI Kiyoto  NAO Division of Radio Astronomy, 電波天文学研究系, 助教授 (90023689)
Project Period (FY) 1990 – 1992
Project Status Completed (Fiscal Year 1992)
Budget Amount *help
¥2,100,000 (Direct Cost: ¥2,100,000)
Fiscal Year 1992: ¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 1991: ¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 1990: ¥700,000 (Direct Cost: ¥700,000)
KeywordsSolar Millimeterwave Burst / Temporal Fine Structure / Solar Flare / Particle Acceleration / 太陽ミリ波バースト / ミリ波電波観測 / 高時間分解 / 時間微細構造 / 高時間分解能
Research Abstract

The objective of this research is to estimate observationally the time scale of particle acceleration in solar flares. We observed 21 events with the 35-GHz Polarimeter for solar activity monitor during from 1990 through 1992. These events were chosen under the criterion that flux density at 35GHz was greater than 2500 sfu.
Main results of analyses of the data are as follows.
1. Peak-to-peak time intervals in time profiles ranges from 0.5 to 500 s. Only 7 % shows peak-to-peak time intervals less than 1 s.
2. Average peak-to peak time interval for each event is proportional to the rise time or the decay time of the event.
3. The above observational results suggest that the time scale of particle acceleration in large solar flares ranges from 1 s to 100 s fot most events, and that the most rapid time scale is about 0.5 s.

Report

(4 results)
  • 1992 Annual Research Report   Final Research Report Summary
  • 1991 Annual Research Report
  • 1990 Annual Research Report
  • Research Products

    (1 results)

All Other

All Publications (1 results)

  • [Publications] 中島 弘: "1991年6月イベントの電波観測" 太陽圈小規模研究会集録(名大STE研).

    • Related Report
      1991 Annual Research Report

URL: 

Published: 1990-04-01   Modified: 2016-04-21  

Information User Guide FAQ News Terms of Use Attribution of KAKENHI

Powered by NII kakenhi