fl143.watari03 Posted: 04-Oct-93 Updated: 03-May-94, 26-Jan-95, 3-Sep-95, 18-May-96 Events specified: N/A
S.Watari, T.Isobe (Communications Research Laboratory)
Emission mechanize of meter wave solar emission is still uncertain. We approach uncertain parts of meter wave solar radio emission by SXT images (morphology, temperature, emission measure, and so on).
Motivation: Solar radio bursts in meter wavelength are emitted associated with disturbances in the solar corona. Interferometers have been used to observe the structure of radio sources. However it is difficult to get details of solar radio sources in meter wave range because of its long wavelength. Our radio spectrograph in Hiraiso (N36.27 E140.63) observes radio emission from the lower part of solar corona and the SXT aboard YOHKOH covers almost the same level of corona. We analyze soft X-ray feature associated with meter wavelength solar radio bursts.
Method/Required Data We examine our solar radio observation. We check FFI and PFI images if we find solar radio bursts in our observation.
Event Examples: 1992/02/17 around NOAA7056 1992/06/07-09 around NOAA7186 1992/08/20 around NOAA7260
This proposal has a complete overlap with the following proposal.
fl009.hudson02 Posted: 26-Jan-92 Updated: 05-Aug-92, 11-Mar-93 Events specified: N/A
X-Ray Counterparts of Meter-Wave Coronal Events
Collaboration: H. Hudson, Canfield, Enome, Kosugi, Nakajima, Sakao, Masuda, Tsuneta, Acton, Nitta, Klimchuk
However, the PI of the proposal (Dr. Hudson) generously accepts you independent analysis. DUC would appreciate it if you could inform them your progress, and send your early draft of the paper.
Now I am analyzing the LDE on 14 October, 1995. A large arcade was observed associated with the LDE. The type IV started on 0806 UT and lasted until 0819 UT in association with the LDE. According to the Nancay radio telescope observation, the radio source was located S30-35 and E20 at a coronal altitude about 0.2 to 0.3 solar radius. The projected location shows a good agreement with the arcade observed by Yohkoh. This event was the CME lunch event.
Update 3-Sep-95
Now, I am analyzing the event on 9 November 1991.
Type II and IV radio bursts were observed associated with this event. Then, the interplanetary shock was observed. This event showed typical CME characteristics and produce the interplanetary shock. Type II and IV radio bursts have been an indicator of the interplanetary shock. This event supports the idea that CMEs tend to accompany type II and IV radio bursts.
Update 26-Jan-95
I am analyzing the strong radio emission on 18 Feb. 1992, 25 Feb. 1992, 15 Mar. 1992. and 7 Sep. 1992 and soft X-ray images now.
Update 03-May-94
I found a X-ray loop expantion, which may be associated with type2 solar radio bursts. It started from a flare site. This was observed associated with 91/11/15 flare. If it is correct, type 2 bursts start from a flare site not from a CME leading edge. In this event, type3 bursts were coincident with hard X-ray bursts during the inpulsive phase. This may suggest that electrons associated with hard X-ray bursts and type 3 bursts have the same origin.
Now, I am still searching events associated with big meterwave bursts.