3-11 July 2007
Merida, Mexico
Mexico/General timezone
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SH 3.2

Place

Location: Merida, Mexico
Room: Yucatan I (Fiesta Americana)
Date: 9 Jul 12:05 - 13:30

Conveners

    • Dr. Dasso, Sergio (Instituto de Astronomía y Física del Espacio (IAFE))

Timetable | Contribution List

Displaying 6 contributions out of 6
Type: Oral Session: SH 3.2
Track: SH.3.2
The residual modulation refers to the invariant level of modulation (modulation potential approximately 450 MV) observed at sunspot minimum since the commencement of the neutron monitor record in 1951. Satellite measurements of the heliomagnetic field show that it exhibited a similar invariance (~5.2 nT) between the sunspot minima of 1965 and 1996. The cosmic ray record since 1428 shows ... More
Presented by Dr. Ken MCCRACKEN on 9/7/2007 at 17:29
Type: Oral Session: SH 3.2
Track: SH.3.2
We present a preliminary study of the observed 11-year modulation of galactic cosmic rays for cycle 23. The detectors selected for the analyses have a track record of stable operations and have median rigidities of response (Rm) covering a wide range of GCR spectrum. Some of the observed features depend upon Rm while others are independent of it. The detectors are located at different global s ... More
Presented by Prof. Harjit AHLUWALIA on 9/7/2007 at 17:17
Type: Oral Session: SH 3.2
Track: SH.3.2
In the first part of paper on the basis of NM data for about 4 solar cycles we investigate hysteresis effects, and separate convection-diffusion and drift modulations in the suggestion that for NM data primary CR energies the diffusion time lag may be neglected. Then we determine the relative role of drift and convection-diffusion effects in the long-term CR variations. In the second par ... More
Presented by Prof. Lev DORMAN on 9/7/2007 at 17:41
Type: Oral Session: SH 3.2
Track: SH.3.2
GRAPES-3 experiment is situated at Ooty in South India 76.7 East 11.4 North. Effective observation area of our muon telescopes is 560 m^2. They are the largest detector in the world of its kind. There were several reports that increase of the solar wind velocity suppresses the intensity of cosmic rays. But there are few which studied qualitatively. We have analyzed the variation of daily me ... More
Presented by T NONAKA on 9/7/2007 at 17:05
Type: Oral Session: SH 3.2
Track: SH.3.2
This paper examines the properties of the ~2300-year periodicity in the galactic cosmic radiation, previously recognized in power spectra of cosmogenic 10Be and 14C. It shows that the periodicity consists of short episodes (50-100 year) of high cosmic ray intensity, such as accompanied the Spoerer and Maunder Minima, separated by long intervals (>1000years) of low intensities similar to, ... More
Presented by Dr. Ken MCCRACKEN on 9/7/2007 at 18:05
Type: Oral Session: SH 3.2
Track: SH.3.2
Sunspot numbers, which reflect solar activity, have presented clear 11-year periodicity since the early 18th century. However in the period around 1645 to 1715 AD sunspots were almost absent, and this period is called the Maunder Minimum, one of grand solar minima implying weak solar activity. Variation of solar activity in grand solar minima can be investigated by determining the concen ... More
Presented by Mr. Kentaro NAGAYA on 9/7/2007 at 17:53
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