Lower limit of intensity for the solar activity in microwaves
- 1. Universidade Mackenzie, Sao Paulo (Brazil). Centro de Radio-Astronomia e Astrofisica
- 2. Surrey Univ., Guildford (UK). Dept. of Physics
Description
The active region McMath 10433 has produced various flares and burts in radio frequency in the beginning of july 1974. This region was scanned countinously in 22.2 GHz with a radio telescope showing a 4 min. arc beam, in various periods of the month. In comparison with the results simultaneously obtained with a normal solar radio telescope, in 7 GHz, it was verified that there is an important explosive activity in lower levels in the limit of detection of an usual patrolling instrument. The morphology of these events, in its progress in the time, is similar to that normaly known, and allowed, the re-interpretation of simple events. A completly new type of event was defined: the fast absorptions. The correlation of events in microwaves with 'SPA' recorded in 'VLF' propagation is also discussed
Abstract (Portuguese)
A regiao ativa McMath 10433 produziu varios 'flares' e erupcoes em radio frequencia no inicio de julho de 1974. Esta regiao foi rastreada continuamente em 22.2 GHz com um radio telescopio apresentando um feixe de 4 min. de arco, em varios periodos do mes. Comparando-se com os resultados obtidos simultaneamente com um radio telescopio solar normal, em 7 GHz, constatou-se haver importante atividade explosiva em niveis inferiores no limite de deteccao de um instrumento comum de patrulhamento. A morfologia destes eventos, em seu progresso no tempo, e similar aquela normalmente conhecida, e permitiu a re-interpretacao dos eventos simples. Um tipo completamente novo de evento foi definido: as rapidas absorcoes. E tambem discutida a correlacao de eventos em micro-ondas com SPA registrados em propagacao de VLFAdditional details
Additional titles
- Original title (Portuguese)
- Limite inferior de intensidade para atividade solar em microondas
Publishing Information
- Journal Title
- An. Acad. Bras. Cienc.
- Journal Volume
- 48
- Journal Issue
- 2
- Series
- An. Acad. Bras. Cienc.
- Journal Page Range
- 187-191
- ISSN
- 0001-3765
INIS
- Country of Publication
- Brazil
- Country of Input or Organization
- Brazil
- INIS RN
- 10475317
- Subject category
- S79: ASTROPHYSICS, COSMOLOGY AND ASTRONOMY;
- Resource subtype / Literary indicator
- Numerical Data
- Descriptors DEI
- ABSORPTION SPECTRA; EXPERIMENTAL DATA; GHZ RANGE 01-100; GRAPHS; MICROWAVE SPECTRA; RADIO TELESCOPES; SENSITIVITY; SOLAR FLARES; SOLAR RADIO BURSTS; TIME DEPENDENCE; TIME RESOLUTION
- Descriptors DEC
- ANTENNAS; DATA; DATA FORMS; ELECTRICAL EQUIPMENT; ELECTROMAGNETIC RADIATION; FREQUENCY RANGE; GHZ RANGE; INFORMATION; NUMERICAL DATA; RADIATIONS; RADIOWAVE RADIATION; RESOLUTION; SOLAR ACTIVITY; SPECTRA; TELESCOPES; TIMING PROPERTIES