A set of simple and accurate formulae for gyrosynchrotron radiation

255

Abstracts

We discuss magnetic

the chemical

potential

of a non-zero

example.

It is shown

that

a sufficiently

low temperatures

and densities,

effect on electron

capture

Separators Fu-min

in the

Using

solar

magnetic

Ha

Soviet

Union,

plages and flare knots separator,

and

flares and magnetic

Department

We analysed angular oscillation

On

period

and

the

It is pointed at least QSOs.

in out that

one of the major (AAnS

1996,

On relativistic

that

models

beams

models

significantly 1997,

was low.

(AAnS of

Lin Qiao,

sunspot

the three

Han Yan-ben

number,

atmospheric We

found

el nifio events

the

in these

37, 443-448).

QSOs

Wang

Jia-qing

spectral

lines by the optical

Department

periodicity

in the redshift

of

window

is

distribution

AApS

The

1997,

Energy

according

test is proposed

result

& He Miao-than

Yunnan

of the test

as the apparent

transverse

using the numbers

of

Obserua-

is tentative,

velocity

of superluminal

because

of severe

is or

sources

observational

17, 13-20. Wu Mei, Song Li-ming,

Chinese

that

the size (photon

count)

and

uniform

in space

from the observed

density BATSE

of Sciences,

Academy

data,

distribution

of y-ray

in a simple

corrected

Yu Wen-fei,

Beijing

bursts

cosmological

for trigger

Li Ti-pei

& Li Yi

100039 calculated model

efficiency

on assuming

does

not

deviate

and dead time.

(AApS

17, 29-36).

The effect of spiral structure on the formation of giant molecular clouds & Song Guo-xuanshanghai We follow disk for 300Myr

Observatory,

the evolution and note

promotes

the formation

inter-arm

region.

A

of simple and accurate

Sciences, For

Nanjing

clouds

of very massive affected.

Jie

(AApS

& Wang

clouds, 1197,

of Sciences,

of mass

into larger

clouds.

Shanghai

structure,

while the number

Zhang

Tong-jie

200030

10’ MO each in a Toomre We find that

but these may subsequently

to the case of no spiral

MO is hardly

Zhang

Academy

of giant clouds in the arms,

Compared

105-lo6

Chun-yun,

basic

aggregation

in the number

set

Chinese

of 120 000

their

increase

Ma

the

100875

1981-1994.

1996,

that

the close link

650011

can be classified

A statistical

Physics,

candle

out that

at Ganyu

of the former

We found

Beijing

years

We point

13-16

37, 437442).

Li Zhi-an,

for the

Ott

field data maps.

1996,

& Hu

210008

thus confirming

University,

Xie Guang-zhong

Kunming

of r-ray bursts

It is shown

of day

the observed

&in Yi-ping,

Institute standard

activity

Normal

of the redshifted

cause

The size distribution of High

at the

241001

the restriction

with low and high redshifts. effects.

on 1990

magnetic

(AAnS

distribution

Wuhu,

of Sciences,

is not redshift-dependent. selection

period

stars,

37, 449-454).

Academy

Relativistic

taken

in the data of solar flux, relative

redshift

factors

beam

Chinese

the

University,

Normal

in solar

40 and 60d.

significantly

Song Mu-tao

Nanjing

in the daily magnetic

in the length

between

6309

and solar

Beijing

when the oscillation

periodicity Anhui

changes

varied

all happened

Physics,

tory,

the 50d oscillation

momentum

NOAA

field reconnection.

of Astronomy,

rate

of neutron

Li Bi-qiang,

of Sciences,

at, or close to the separator,

El nifio events and the 50 d oscillation and Zhao Juan

flare sites

the

the field separator

the capture

3’7, 430-436)

Observatory

are located

in a strong

33S is taken as a specific

G) on the surface

Academy

region

Mountain

we determined

1966,

Chinese

of the active

of Purple

bright

between

field

Observatory,

filtergrams

Station

(AA&

gas embedded

potential.

field can decrease

strong

nil.

electron

screening

but for the fields (10s-10’3

is almost

Mountain

Purple

Observing

years

temperature

field and the effect of the field on the electron

the effect

the spiral

galactic structure

disintegrate

of the spiral

of clouds with masses

in the

arms

is an

in the range

17, 50-56.

formulae

for gyrosynchrotron

Xin-dongPurple

Mountain

radiation

Observatory,

Chinese

Zhou

Ai-hua,

Academy

of

210008

two of the three

indices

that

figure

in usual

approximate

formulae

for emissivity

and

Abstracts

256

absorptivity in gyrosynchrotron electron

power index

radiation,

6. For usual

we use a quadratic

astrophysical

range

rather

than

of 8 and harmonic

a linear

number,

fitting

of the

the accuracies

of

are better than 7% and 17%, much better than previous ones based on linear fitting.

our formulae

(AApS 1997, 17, 81-85). Solar gyromagnetic Astronomical There Zyr,

system

determines

very small.

1997,

momentum lever

that

the centre

the rotation

in the solar

The

gain

of our

f 0.23 dB,

energy

Nanjing The

2-m

and that

diffraction

Wen-li

system

primary

mirror

hexagonal

sub-mirror

with

is a single

hexagonal

selection

a 1.1-m system

while

diagonal.

is kept

Through

(AApS

1997,

problem Institute

The optics

expression

is derived

expression and

be

Observatory

Shang

of Sciences,

Academy

of the Zernike

of tilt isoplanatic

Sasiela.

For a turbulence

0.5c(.m operating is 5 prad.

from

wavelength,

The @,;I1 is a factor

with

This

paper

different energy

unchanged

analyzing

been

Schmidt

the detailed and fields

Xu

segment

the reason

Ma

and

segment

diffraction when

of the optical each

plate

Each

calculates

the calculations,

to be

17, 91-97). mirrors

correcting

mirrors.

sky areas

and when

1997,

210042

segmented

distribution

determined

(AApS

two segmented

Nanjing

are

been

energy

the star

system

of Ma

is a is on

when

MB

and MB

is a

of the sub-mirror

size

17, 96-102).

& Song

Anhui

system

MB

has

f 0.17dB.

of a reflecting

the diffraction MA

waves

Center,

M A and

in observing

The tilt determination Zheng-fang

consists

Both

MB.

sub-mirror.

is justified.

Research

of LAMOST

It also calculates

6-m mirror

at 3.2cm

at 21 cm, 41.12

of an optical

Instrument

of the optical

the meridian.

operating

distribution

Astronomical

optical

distribution

antenna

of our 10-m antenna

a spherical

1.5-m

must

650011

The 41.75

of 99.9%.

of the solar

17, 86-91).

A determination of the gain in two radio telescopes of Yunnan Qiong-zhen, Hu Han-ming & Li yong-sheng Yunnan Observatory, Chinese Kunming

the centre

and for a time lag

far in excess

of the sun around

It is inferred

about

1900-1980

at a significane

the motion

moment.

100080

For the period

is as high as 0.81

dipole

Beijing

of solar angular

number.

of gyromagnetism,

the solar

(AApS

the variation

sunspot

coefficient

to the theory

of Sciences,

Academy

between

and the annual

the correlation

According system

Chinese

is a close correlation

of the solar of *

effect and the evolution of solar magnetic field Dong Shi-1unBeijirag

Observatory,

of laser guide star in adaptive optics of Optics

tilt-corrected angle is derived,

at Kunming angle

than 8s under

of laser

guide

of tilt anisoplanatic

which coincides

measured

Fan Cheng-yu Academy of Sciences

Chinese

Mechanics, variance

By a criterion

the tilt anisoplanatic of 2 larger

Fine

anisoplanatic

polynomials. model

and

with the derived and a 0.6m

is 15.3 prad,

these conditions.

star

in adaptive

variance

1 rad2,

expression

diameter

aperture

and the isoplanatic (AApS

1997,

the

of Parenti at a

angle

17, 103-106).

0s