On the average rate of growth in sunspot number and the size of the sunspot cycle

Solar Physics ◽  
1990 ◽  
Vol 125 (1) ◽  
pp. 133-141 ◽  
Author(s):  
Robert M. Wilson
Keyword(s):  
Sunspot Number ◽  
Average Rate ◽  
Sunspot Cycle ◽  
Rate Of Growth

Cyclic Evolution of Sunspots: Gleaning New Results from Old Data

2000 ◽  
Vol 179 ◽  
pp. 163-165
Author(s):  
S. K. Solanki ◽  
M. Fligge ◽  
P. Pulkkinen ◽  
P. Hoyng
Keyword(s):  
Sunspot Number ◽  
Sunspot Cycle ◽  
Preliminary Results ◽  
Butterfly Diagram

AbstractThe records of sunspot number, sunspot areas and sunspot locations gathered over the centuries by various observatories are reanalysed with the aim of finding as yet undiscovered connections between the different parameters of the sunspot cycle and the butterfly diagram. Preliminary results of such interrelationships are presented.

A Clock in the Sun?

2019 ◽  
Vol 15 (S354) ◽  
pp. 127-133
Author(s):  
C. T. Russell ◽  
J. G. Luhmann ◽  
L. K. Jian
Keyword(s):  
Sunspot Number ◽  
Solar Minimum ◽  
Sunspot Cycle ◽  
Solar Dynamo ◽  
The Sun ◽  
Average Period ◽  
Magnetic Cycle ◽  
Number Cycle ◽  
As If

AbstractThe sunspot cycle is quite variable in duration and amplitude, yet in the long term, it seems to return to solar minimum on schedule, as if guided by a clock with an average period of close to 11.05 years for the sunspot number cycle and 22.1 years for the magnetic cycle. This paper provides a brief review of the sunspot number cycle since 1750, discusses some of the processes controlling the solar dynamo, and provides clues that may add to our understanding of what controls the cadence of the solar clock.

Reassessing the Predictions of Sunspot Cycle 24

2018 ◽  
Vol 13 (S340) ◽  
pp. 319-320
Author(s):  
Nipa J. Bhatt ◽  
Rajmal Jain
Keyword(s):  
Sunspot Number ◽  
Data Center ◽  
Activity Index ◽  
Sunspot Cycle ◽  
Prediction Method ◽  
Maximum Amplitude ◽  
Annual Maximum ◽  
Sunspot Minimum ◽  
Cycle 24 ◽  
Geomagnetic Activity Index

AbstractPredictions of sunspot cycle are important due to their space weather effects. Bhattet al.(2009) predicted sunspot cycle 24 (Maximum amplitude: 92.8±19.6; Timing:October 2012±4 months) using relative sunspot number (International Sunspot Number), and average geomagnetic activity indexaaconsidering 2008 as the year of sunspot minimum. Owing to the extended solar minimum till 2009, we re-examine our prediction model. Also, the newly calibrated international sunspot number reduces many discrepancies in the old dataset and is available from Solar Influences Data Center (SIDC) website. Considering 2009 as sunspot minimum year and newly calibrated international sunspot number, (i) The annual maximum amplitude of cycle 24 = 118.5±24.4 (observed = 113.3±0.1), (ii) A smoothed monthly mean sunspot number maximum in January 2014±4 months (observed in February 2014). Our prediction method appears to be a reliable indicator for the predictability of cycle 25.

Growth rate of secondary hydatid cysts of the brain

1985 ◽  
Vol 62 (5) ◽  
pp. 781-782 ◽  
Author(s):  
Jorge Sierra ◽  
Jorge Oviedo ◽  
Marcelo Berthier ◽  
Ramon Leiguarda
Keyword(s):  
Growth Rate ◽  
Average Rate ◽  
Young Patients ◽  
Hydatid Cysts ◽  
Content Type ◽  
Rate Of Growth ◽  
The Brain ◽  
Fine Print

✓ Bilateral intracerebral hydatid cysts developed in a 14-year-old patient after an infarct of presumed embolic origin in the left frontotemporoparietal region. The average rate of growth of these cysts was about 5 cm per year. This suggests that the growth rate is far from uniform and indeed, particularly in young patients, may be much faster than originally estimated.

Prospects for the UK Economy

2004 ◽  
Vol 189 ◽  
pp. 37-56
Author(s):  
Simon Kirby ◽  
Robert Metz ◽  
Rebecca Riley
Keyword(s):  
Average Rate ◽  
Output Gap ◽  
Rate Of Growth ◽  
The Uk

The economy continued to grow faster than its trend rate in the first half of 2004. Preliminary estimates show GDP rising by 0.9 per cent in the second quarter of the year. Measured on an annualised basis, this brings the average rate of growth since the middle of last year to 3.6 per cent. It is our view that this brings the economy very close to capacity. We expect the output gap to average 0.1 per cent of trend GDP this year (see chart 1).

The influence of vaccination with Fecundin and supplementation with lupin grain on the reproductive performance of Merino ewes in Western Australia

1990 ◽  
Vol 30 (4) ◽  
pp. 469
Author(s):  
KP Croker ◽  
MA Johns ◽  
SH Bell ◽  
GA Brown ◽  
JF Wallace
Keyword(s):  
Western Australia ◽  
Reproductive Performance ◽  
Average Rate ◽  
Multiple Pregnancies ◽  
Wool Production ◽  
Rate Of Growth ◽  
Nutritional Conditions ◽  
Average Quantity

The reproductive performances of groups of 4-6-year-old medium wool Merino ewes that were vaccinated with Fecundin and/or fed sweet lupin grain prior to and during the early part of the joining period were compared with untreated ewes over 2 years. The rams were joined with the ewes in early January of each year. In both years the Fecundin and lupin treatments increased ovulation rates (between 0.13 and 0.56) and the incidence of multiple pregnancies (between 1 and 36%). The proportions of lambs born following treatment with Fecundin were larger than those from the ewes fed only lupins. When the treatments were combined, there were no increases in lambs born above that of Fecundin alone. Pregnancy significantly depressed wool production from individual ewes, while those with more than 1 lamb produced less wool than those with only 1 lamb. However, the average quantity (4.6 kg greasy) and quality of wool produced by the ewes each year was similar for all groups, indicating that the variation in the incidence of multiple pregnancies had not affected flock wool production. The average rate of growth of the progeny from marking to weaning was also similar for each group (191 and 238 g/head.day for years 1 and 2, respectively) even though there were more multiple-born lambs in the Fecundin-treated groups. On a flock basis, it would appear that the nutritional conditions experienced during this study were adequate to avoid significant penalties associated with multiple pregnancies.

scholarly journals Some Reflections on "Planning Experience in Pakistan"

1968 ◽  
Vol 8 (3) ◽  
pp. 391-398
Author(s):  
Taufiq M. Khan
Keyword(s):  
Central Government ◽  
Average Rate ◽  
Reliable Data ◽  
Annual Conference ◽  
Reasonable Accuracy ◽  
Rate Of Growth ◽  
Statistical Series ◽  
Economic Association ◽  
Planning Processes ◽  
Analytical Tools

In his address delivered at the 15th Annual Conference of the Pakistan Economic Association, Dr. M. N. Huda has reviewed the planning experience in Pakistan. He is eminently suited to undertake this review as he has been very intimately associated with the planning processes at both the provincial and central government levels. The address, though brief, raises a number of important issues in regard to the formulation and implementation of the annual and five-year plans of the country, issues which deserve serious consideration by the planning authorities. The following discussion of his address is an attempt to supplement some of the points raised' by him. With the quickening pace of economic development, the need for more and accurate data is being increasingly felt in the country. Lack of adequate and reliable data not only hampers the use of sophisticated analytical tools for formulating comprehensive national and regional plans but also adversely affects the measurement of the performance of the economy from year to year. This is not the occasion to go into the details of the merits and demerits of the statistical series which are now being published by various sources. Suffice it to say that there is a great need of improving the contents, quality and regular¬ity of these data. The collection of statistics is not keeping pace with the improvements in the economic activity. Even such vital information as the size of population and its rate of growth is not known with any reasonable accuracy. The results of the 1961 Census of Population are generally adjusted upward by 8.25 per cent for underenumeration in the census. Similarly, the average rate of inter-censal increase in 1961 Census was estimated to be 2.15 per cent for Pakistan, 2.36 per cent for West and 1.91 per cent for East Pakistan. The annual rate of growth of population is now assumed to be 2.6 per cent although there is evidence that it exceeds 3 per cent.

scholarly journals Global and regional emissions estimates of 1,1-difluoroethane (HFC-152a, CH<sub>3</sub>CHF<sub>2</sub>) from in situ and air archive observations

2016 ◽  
Vol 16 (1) ◽  
pp. 365-382 ◽  
Author(s):  
P. G. Simmonds ◽  
M. Rigby ◽  
A. J. Manning ◽  
M. F. Lunt ◽  
S. O'Doherty ◽  
...  
Keyword(s):  
Growth Rate ◽  
Mole Fraction ◽  
Average Rate ◽  
Stratospheric Ozone ◽  
Annual Average ◽  
Bottom Up ◽  
Rate Of Growth ◽  
Global Growth ◽  
Hfc 152A

Abstract. High frequency, in situ observations from 11 globally distributed sites for the period 1994–2014 and archived air measurements dating from 1978 onward have been used to determine the global growth rate of 1,1-difluoroethane (HFC-152a, CH3CHF2). These observations have been combined with a range of atmospheric transport models to derive global emission estimates in a top-down approach. HFC-152a is a greenhouse gas with a short atmospheric lifetime of about 1.5 years. Since it does not contain chlorine or bromine, HFC-152a makes no direct contribution to the destruction of stratospheric ozone and is therefore used as a substitute for the ozone depleting chlorofluorocarbons (CFCs) and hydrochlorofluorocarbons (HCFCs). The concentration of HFC-152a has grown substantially since the first direct measurements in 1994, reaching a maximum annual global growth rate of 0.84 ± 0.05 ppt yr−1 in 2006, implying a substantial increase in emissions up to 2006. However, since 2007, the annual rate of growth has slowed to 0.38 ± 0.04 ppt yr−1 in 2010 with a further decline to an annual average rate of growth in 2013–2014 of −0.06 ± 0.05 ppt yr−1. The annual average Northern Hemisphere (NH) mole fraction in 1994 was 1.2 ppt rising to an annual average mole fraction of 10.1 ppt in 2014. Average annual mole fractions in the Southern Hemisphere (SH) in 1998 and 2014 were 0.84 and 4.5 ppt, respectively. We estimate global emissions of HFC-152a have risen from 7.3 ± 5.6 Gg yr−1 in 1994 to a maximum of 54.4 ± 17.1 Gg yr−1 in 2011, declining to 52.5 ± 20.1 Gg yr−1 in 2014 or 7.2 ± 2.8 Tg-CO2 eq yr−1. Analysis of mole fraction enhancements above regional background atmospheric levels suggests substantial emissions from North America, Asia, and Europe. Global HFC emissions (so called “bottom up” emissions) reported by the United Nations Framework Convention on Climate Change (UNFCCC) are based on cumulative national emission data reported to the UNFCCC, which in turn are based on national consumption data. There appears to be a significant underestimate ( >  20 Gg) of “bottom-up” reported emissions of HFC-152a, possibly arising from largely underestimated USA emissions and undeclared Asian emissions.

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