Expansion pattern of flare-associated disturbances near the Earth's orbit during October 23 to November 4, 1968

Journal Article · Sat Dec 01 04:00:00 EST 1973 · Nature (London) Phys. Sci., v. 246, no. 152, pp. 70-72

DOI:https://doi.org/10.1038/physci246070a0· OSTI ID:4317270

Sakurai, K; Chao, J K

It is stated that a series of solar flares accompanying type II and type IV radio-bursts was observed while an active region was present on the solar disk during October-November 1968. Most of these flares were associated with solar cosmic rays and SSC geomagnetic storms; more than ten times the normal number of SSC storms were observed on the earth during this period. The source flares were identified from solar and geomagnetic data, and from the records transmit times of flare-associated disturbances between sun and earth were estimated. Expansion patterns of the disturbances near the earth's orbit were also investigated from the records. These patterns appeared to be useful for studying the propagation of interplanetary shock waves generated by solar flares. The flare-associated disturbances were identified as interplanetary shock waves, and it was also suggested that the physical state of interplanetary space between sun and earth is not greatly disturbed by the propagation of flare-associated disturbances in this space. Furthermore, the eastward expansion pattern of the disturbances suggests that their propagation is controlled by the ambient interplanetary magnetic field transported from the sun by the solar wind. The mechanism of the anisotropic expansion of these disturbances appears to be related to the manner of injection of flare energy to build up the source for these disturbances in the flare region. (UK)

• Research Organization: Goddard Space Flight Center, Greenbelt, MD
• NSA Number: NSA-29-021965
• OSTI ID: 4317270
• Journal Information: Nature (London) Phys. Sci., v. 246, no. 152, pp. 70-72, Journal Name: Nature (London) Phys. Sci., v. 246, no. 152, pp. 70-72; ISSN NPSCA
• Country of Publication: United Kingdom
• Language: English

Related Subjects

*INTERPLANETARY SPACE-- SHOCK WAVES
*SOLAR FLARES-- SHOCK WAVES
ANISOTROPY
COSMIC RADIATION
EXPANSION
MAGNETIC STORMS
N56400* --Physics (Astrophysics & Cosmology)--Solar Phenomena
SOLAR RADIATION
SOLAR RADIO BURSTS
SOLAR WIND
WAVE PROPAGATION